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Gradient Descent-Based Prediction of Heat-Transmission Rate of Engine Oil-Based Hybrid Nanofluid over Trapezoidal and Rectangular Fins for Sustainable Energy Systems 认领 引用
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作者 Maddina Dinesh Kumar S.U.Mamatha +2 位作者 Khalid Masood Nehad Ali Shah Se-Jin Yook 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第1期627-660,共34页
Fluid dynamic research on rectangular and trapezoidal fins is aimed at increasing heat transfer by means of large surfaces.The trapezoidal cavity form is compared with its thermal and flow performance,and it is reveal... Fluid dynamic research on rectangular and trapezoidal fins is aimed at increasing heat transfer by means of large surfaces.The trapezoidal cavity form is compared with its thermal and flow performance,and it is revealed that trapezoidal fins tend to be more efficient,particularly when material optimization is critical.Motivated by the increasing need for sustainable energy management,this work analyses the thermal performance of inclined trapezoidal and rectangular porous fins utilising a unique hybrid nanofluid.The effectiveness of nanoparticles in a working fluid is primarily determined by their thermophysical properties;hence,optimising these properties can significantly improve overall performance.This study considers the dispersion of Graphene Oxide(GO)and Molybdenum Disulfide in the base fluid,engine oil.Temperature profiles are analysed by altering the radiative,porosity,wet porous,and angle of inclination parameters.Surface and contour plots are constructed by using the Lobatto IIIa Collocation Method with BVP5C solver in MATLAB and Gradient Descent Optimisation to predict the combined heat transfer rate.According to the study,fluid temperature consistently decreases when the angle of inclination,wet porous parameter,porosity parameter,and radiative parameter increase,suggesting significantly improved heat dissipation.The trapezoidal fin consistently exhibits a superior heat transfer mechanism than a rectangular fin.It is found that the trapezoidal fin transmits heat at a rate that is 0.05%higher than that of the rectangular fin.Validation of the present study is done through the comparison of previous studies.This research provides useful design insights for sophisticated engineering uses,including electrical cooling devices,heat exchangers,radiators,and solar heaters. 展开更多
关键词 Rectangular fin hybrid nanofluid trapezoidal fin angle of inclination gradient descent optimization Lobatto IIIa collocation method
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Optimization of Three-Degree-of-Freedom Biomimetic Pectoral Fin Propulsion Law 认领 引用
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作者 LI Bin LI Zonggang +1 位作者 LI Haoyu DU Yajiang 《Journal of Shanghai Jiaotong university(Science)》 EI 2026年第1期195-208,共14页
To optimize the movement of the three-degree-of-freedom(3-DOF)pectoral fins,a 3-DOF model of the dolphin-like pectoral fins was established,and the effects of different parameters of the pectoral fins on their propell... To optimize the movement of the three-degree-of-freedom(3-DOF)pectoral fins,a 3-DOF model of the dolphin-like pectoral fins was established,and the effects of different parameters of the pectoral fins on their propelling performance were simulated using computational fluid dynamics(CFD)technology.Using CFD simulation data as a training set and a multi-layer perceptron(MLP)neural network as a prediction model,the average thrust and lift of the pectoral fin motion under different motion cycles,rowing amplitudes,flapping amplitudes,and feathering amplitudes were predicted and modeled.A multi-objective genetic algorithm was used to obtain the optimal parameter values for maximum thrust and minimum absolute lift,and the optimal motion law for 3-DOF motion was brought.The results showed that the optimal propulsion performance was achieved at a period of 1 s,a rowing amplitude of 36°,a flapping amplitude of 18°,and a feathering amplitude of 56°.Finally,the force and displacement of the robotic fish were collected through indoor pool experiments and compared with the simulation results,indicating that the simulation results are of considerable reliability.The research results have specific guiding significance for the design of the pectoral fins of biomimetic robotic fish. 展开更多
关键词 biomimetic pectoral fins law of motion computational fluid dynamics(CFD) multi-layer perceptron(MLP) finite volume method
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Temperature drop and output work of radial inflow in rotating cavity with finned vortex reducer 认领 引用
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作者 Jian HE Xiang LUO +2 位作者 Dongdong LIU Zeyu WU Kaifeng SONG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期344-356,共13页
This study aims to investigate the output work and temperature drop in a compressor disk cavity equipped with a Finned Vortex Reducer(FVR)to improve the performance of the secondary air system of gas turbine engines.B... This study aims to investigate the output work and temperature drop in a compressor disk cavity equipped with a Finned Vortex Reducer(FVR)to improve the performance of the secondary air system of gas turbine engines.Based on the experimentally validated simulation results,we explore the effects of the rotating speed of the disk,coolant mass flow rate and the size of the fin on the flow and energy transfer of the radial inflow in the rotating cavity.The results show that the circumferential acceleration of the flow by Coriolis force is inhibited by the radial assembled fins from the rotating coordinate system,forcing the swirl ratio into one in the finned region and resulting in the reduction of the pressure drop.Outside the finned region,the variation characteristics of the swirl ratio follows that of a free vortex,which is typically found in the radial inflow through a simple cavity,i.e.,cavity without any vortex reducer.For the output work of the FVR cavity flow,it is mainly caused by the pressure difference on the fin surfaces,while those by the viscous shear force could be neglected.We propose a simplified model to predict the output work and total temperature change in the FVR cavity,which generally matches well with the simulation result.The research findings can provide guidance for the design and optimization of secondary air system in gas turbines. 展开更多
关键词 Finned vortex reducer Output work Radial inflow Swirl ratio Temperature drop
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Enhancement of Thermal Performance of Heat Storage Tanks by the Synergistic Effect of Fin,Metal Foam,and Nanoparticles 认领 引用
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作者 Rukun Hu Liao Zhang +7 位作者 Wenbin Han Wei Chen Bo Ma Xuan Liu Yongzhi Lei Qian Lu Yuanji Li Xiaohu Yang 《Frontiers in Heat and Mass Transfer》 EI CAS 2026年第3期189-212,共24页
To enhance the efficiency of phase change heat storage,this study investigates the synergistic effects and parameter interactions of a coupled strategy integrating fins,metal foam,and nanoparticles.A validated numeric... To enhance the efficiency of phase change heat storage,this study investigates the synergistic effects and parameter interactions of a coupled strategy integrating fins,metal foam,and nanoparticles.A validated numerical model is developed for a shell-and-tube heat storage unit.The influence of porosity and pore density of metal foam,as well as Al2O3 nanoparticle concentration,on melting behavior,heat storage rate,and fluid flow features are systematically analyzed.Results indicate that reducing porosity significantly enhances heat conduction,shortening the complete melting time by up to 53.71%.Conversely,increasing pore density markedly suppresses natural convection,reducing the average liquid velocity by 64.62% and consequently extending the melting duration.The incorporation of nanoparticles consistently improves thermal performance;specifically,a 15%concentration reduces the melting time by 25.49%.Notably,a strong synergistic interaction is revealed.The enhancement of nanoparticles is more pronounced in metal foams with lower intrinsic conductivity,yielding an average additional enhancement of 17.24%.The optimal configuration identified in this study comprises metal foam with a porosity of 0.98 and a pore density of 10 PPI,coupled with 15%nanoparticles,achieving a heat storage rate 51.47% higher than the least efficient design.These findings elucidate the underlying coupling mechanisms and provide practical guidelines for the multi-parameter optimization of high-performance composite PCM-based thermal energy storage systems. 展开更多
关键词 Melting characteristic fin metal foam nanoparticles latent heat storage heat transfer enhancement
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A Rectifier Bridge Circuit Based on Metal-semiconductor-metal Fin Tunneling Diode for High-frequency Application 认领 引用 被引量：1
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作者 DENG Hengyang QIN Cuijie +5 位作者 HAO Shenglan FENG Guangdi ZHU Qiuxiang TIAN Bobo CHU Junhao DUAN Chungang 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2026年第2期253-261,共9页
Tunneling diodes hold significant promise for future rectification in the terahertz(THz)and visible light spectra,thanks to their femtosecond-scale transit-time tunneling capabilities.In this work,TiN/ZnO/Pt fin tunne... Tunneling diodes hold significant promise for future rectification in the terahertz(THz)and visible light spectra,thanks to their femtosecond-scale transit-time tunneling capabilities.In this work,TiN/ZnO/Pt fin tunneling diodes(FTDs)with tunneling distances of 10 and 5 nm are fabricated,which demonstrate remarkable characteristics,including ultrahigh asymmetry(1.6×104for 10 nm device and 1.6×103 for 5 nm device),high responsivity(25.3 V-1 for 10 nm device and 28.3 V-1 for 5 nm device)at zero bias,surpassing the thermal voltage limit of conventional Schottky diodes,and low turn-on voltage(Von)of approximately 100 mV for both devices,making them ideal for power conversion applications.Using technology computer-aided design(TCAD)simulations,the observed asymmetry in electronic transport is attributed to the transition between Fowler-Nordheim tunneling(FNT)and trap-assisted tunneling(TAT)under different biasing conditions,as illustrated by the corresponding energy band profiles.Furthermore,by integrating the FTDs,a rectifier bridge circuit is designed and exhibits full-wave rectification behavior,validated through SPICE simulations for THz-band operations.This advancement offers a highly efficient solution for THz-band energy conversion and effective detection applications. 展开更多
关键词 fin tunneling diode TCAD simulation rectifier bridge SPICE simulation
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The Combination of Non-Uniform Curved Fins and Nanoparticles for Enhanced Phase Change Heat Storage 认领 引用
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作者 Xujun Gao Wei Chen +6 位作者 Bo Ma Rukun Hu Liao Zhang Yongzhi Lei Wenbin Han Yuanji Li Xiaohu Yang 《Fluid Dynamics & Materials Processing》 EI 2026年第3期172-192,共21页
Enhancing the efficiency of phase-change heat storage is vital for maximizing the utilization of renewable energy.This study examines the synergistic effect of non-uniformly shaped fins and nanoparticles on the meltin... Enhancing the efficiency of phase-change heat storage is vital for maximizing the utilization of renewable energy.This study examines the synergistic effect of non-uniformly shaped fins and nanoparticles on the melting performance of phase-change storage tanks.The problem is addressed using a finite volume framework coupled with the enthalpy–porosity method,with the numerical model rigorously validated against experimental data.The analysis explores the influence of varying fin deflection angles and nanoparticle concentrations on melting dynamics.It is shown that a downward fin deflection of 6◦reduces melting time to 570 s,representing a 20.8% improvement over uniform fins.Introducing 1% nanoparticles further accelerates melting,reducing time by 36.54% compared to the nanoparticle-free case.The combined strategy of 6◦fin deflection and 1%nanoparticle addition shows the most economic heat storage rate,achieving an exceptional 80.74% enhancement relative to a tank with uniform fins. 展开更多
关键词 Heat transfer enhancement melting characteristic latent heat storage finned tube nanoparticles
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温度对14nm FinFET SRAM单粒子效应的影响 认领 引用
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作者 谭钧元 郭刚 +4 位作者 张付强 江宜蓓 陈启明 韩金华 秦丰迪 《半导体技术》 CAS 北大核心 2026年第1期87-93,共7页
由于鳍式场效应晶体管静态随机存储器(FinFET SRAM)特有的鳍片电荷共享机制,其对单粒子效应(SEE)呈现出与传统平面器件截然不同的敏感特性。利用TCAD仿真构建14 nm FinFET SRAM模型并结合重离子实验加以验证,研究了温度对14 nm FinFET S... 由于鳍式场效应晶体管静态随机存储器(FinFET SRAM)特有的鳍片电荷共享机制,其对单粒子效应(SEE)呈现出与传统平面器件截然不同的敏感特性。利用TCAD仿真构建14 nm FinFET SRAM模型并结合重离子实验加以验证,研究了温度对14 nm FinFET SRAM电荷收集机制的影响。结果表明,随着温度的升高,高线性能量转移(LET)离子诱导的电荷收集过程逐渐减弱,多节点电荷收集现象也会逐渐减弱,且当环境温度达到125℃临界值时,敏感节点会出现收集电荷的雪崩式累积现象。此外,随着温度的升高,器件的翻转截面从1.27×10-3cm2增大到1.81×10-3cm2,增大了约43%,且在高温下翻转截面的增大趋势愈发显著,该结果与仿真结果良好吻合。 展开更多
关键词 鳍式场效应晶体管静态随机存储器(FinFET SRAM) 单粒子效应(SEE) 电荷收集 TCAD 温度
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Shark’s Fin and Sichuan Pepper对中国食文化的无本译写研究 认领 引用
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作者 余张至 李林波 《译苑新谭》 2026年第1期95-103,共9页
无本译写是相对于依据单个底本进行翻译的,以“译”为最终目的的传统有本翻译而提出的翻译新理念。本文以英国作家扶霞·邓洛普(Dunlop.F)的无本译写著作Shark’s Fin and Sichuan Pepper为研究对象,通过分析该著在无本译写方面的特... 无本译写是相对于依据单个底本进行翻译的,以“译”为最终目的的传统有本翻译而提出的翻译新理念。本文以英国作家扶霞·邓洛普(Dunlop.F)的无本译写著作Shark’s Fin and Sichuan Pepper为研究对象,通过分析该著在无本译写方面的特征,探讨其如何以独特的多底本译写结合方式打破跨文化传播局限,以多元视角和创新手法向世界展现中国食文化的魅力与内涵,进而反思无本译写对跨文化交际、文化传播策略以及中国文化对外传播的启示与借鉴意义。 展开更多
关键词 Shark’s Fin and Sichuan Pepper 扶霞·邓洛普 无本译写 中国食文化
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基于TCAD与DNN的FinFET器件辐射总剂量效应模型 认领 引用
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作者 周颖 刘小年 +1 位作者 刘焱森 曹鹏 《电子学报》 EI CAS CSCD 北大核心 2026年第2期634-645,共12页
先进鳍式场效应晶体管(Fin Field-Effect Transistor,FinFET)因其高集成度、强栅极控制能力、高驱动电流、高开关速度、低泄漏电流等优势,在先进集成电路中成为主要的晶体管器件。为得到器件物理层面的FinFET工艺下不同器件尺寸的辐射... 先进鳍式场效应晶体管(Fin Field-Effect Transistor,FinFET)因其高集成度、强栅极控制能力、高驱动电流、高开关速度、低泄漏电流等优势,在先进集成电路中成为主要的晶体管器件。为得到器件物理层面的FinFET工艺下不同器件尺寸的辐射总剂量(Total-Ionizing-Dose,TID)效应模型,本文结合TCAD(Technology Computer Aided Design)技术与深度神经网络(Deep Neural Networks,DNN)技术提出并建立了一个辐射总剂量效应模型(TCAD-DNN模型)来预测器件的TID效应的电学响应。本文采用Synopsys Sentaurus TCAD软件对SMIC 14 nm CMOS工艺下的FinFET进行三维(3D)器件建模并进行实测数据校准,后利用Sentaurus软件内置的Gamma射线总剂量辐射模型对器件进行辐射总剂量效应模拟仿真,相比于添加固定电荷以模拟总剂量辐射效应的做法,Gamma射线总剂量辐射模型可以得到更为真实的总剂量效应陷阱电荷分布。通过对器件在辐照前后进行实际电学特性测试,将得到的辐照前后实测数据用于TCAD模型校准,对此工艺节点下不同器件尺寸进行仿真产生数据集,其中32928个器件数据点作为训练集对该模型进行训练,另外8232个器件数据点作为测试集,对FinFET器件在开态(ON)辐照偏置下的总剂量效应进行预测。训练后的最终模型所得曲线与测试集数据的平均相对误差为2.98‰。此外,模型所得预测曲线与辐照后的实测数据也有极佳的吻合度,进一步验证了模型在实际工程应用中的巨大潜力。本文结合TCAD仿真技术和深度学习技术构建的TCAD-DNN模型仅需提供特定尺寸范围内的若干器件尺寸的电学特性曲线作为训练集对TCAD-DNN模型进行训练,训练完成后的模型能够在毫秒量级的调用时间内得到一定尺寸和总剂量范围内所有器件可靠的电学性能。此模型有效避免了TCAD仿真中的耗时过长和收敛性不稳定问题,成功预测了器件总剂量效应的电学响应对辐射剂量和器件几何参数方面的依赖性,该模型较高的预测精度和较好的灵活性使其能够应用在FinFET器件设计优化和器件与集成电路抗辐射加固等领域。 展开更多
关键词 TCAD 鳍式场效应晶体管 总剂量效应 深度神经网络 半导体 辐射效应
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Optimizing the cooling efficiency of a convex spine fin with wetted characteristics beneficial in automotive components:an execution of Charlier polynomial collocation method 认领 引用
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作者 A.N.MALLIKARJUNA S.K.ABHILASHA +2 位作者 R.S.VARUN KUMAR F.GAMAOUN B.C.PRASANNAKUMARA 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第8期1609-1630,共22页
Fins are extensively utilized in heat exchangers and various industrial applications as they are lightweight and can benefit in various systems,including electronic cooling devices and automotive components,owing to t... Fins are extensively utilized in heat exchangers and various industrial applications as they are lightweight and can benefit in various systems,including electronic cooling devices and automotive components,owing to their adaptable design.Furthermore,spine fins are introduced to improve performance in applications such as automotive radiators.They can be shaped in different ways and constructed from a collection of materials.Inspired by this,the present model examines the effects of internal heat generation and radiation-convection on the thermal distribution in a wetted convex-shaped spine fin.Using dimensionless terms,the proposed fin model involving a governing nonlinear ordinary differential equation(ODE)is transformed into a dimensionless form.The study uses the operational matrix with the Charlier polynomial collocation method(OMCCM)to ensure precise and computationally efficient numerical solutions for the dimensionless equation.In order to aid in the analysis of thermal performance,the importance of major parameters on the temperature profile is graphically illustrated.The main outcome of the study reveals that as the radiation-conductive,wet,and convective-conductive parameters increase,the heat transfer rate progressively improves.Conversely,the ambient temperature and internal heat generation parameters show an inverse relationship. 展开更多
关键词 fin wet fin spine internal heat generation Charlier polynomial collocation method
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14 nm体硅FinFET工艺标准单元的总剂量效应 认领 引用 被引量：2
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作者 李海松 王斌 +3 位作者 杨博 蒋轶虎 高利军 杨靓 《半导体技术》 CAS 北大核心 2025年第6期619-624,647,共6页
随着鳍式场效应晶体管(FinFET)在高辐射环境中的广泛应用,其在总剂量(TID)效应下的可靠性成为研究重点。基于14 nm体硅互补金属氧化物半导体(CMOS)工艺FinFET标准单元,设计了一款TID效应实验验证电路。利用60Co产生的γ射线研究了该... 随着鳍式场效应晶体管(FinFET)在高辐射环境中的广泛应用,其在总剂量(TID)效应下的可靠性成为研究重点。基于14 nm体硅互补金属氧化物半导体(CMOS)工艺FinFET标准单元,设计了一款TID效应实验验证电路。利用60Co产生的γ射线研究了该验证电路的静态电流以及环振电路的环振频率和触发器电路的时序特性随辐照总剂量变化的情况,表征了FinFET工艺的本征抗辐射能力。实验结果表明,当辐照总剂量达到1000 krad(Si)时,验证电路静态电流增大了121%,且整个过程基本呈线性趋势增长,增长斜率约为3.14μA/krad(Si);组合逻辑单元时序参数变化绝对值小于0.6%,时序逻辑单元CK到输出端的延迟时间变化绝对值小于1%。这主要归因于TID效应对FinFET的阈值电压和饱和电流影响较小,而对器件的亚阈值漏电流影响较大。该研究结果为先进工艺超大规模集成电路在空间辐射环境中的应用提供了一定的理论指导。 展开更多
关键词 14 nm 鳍式场效应晶体管(FinFET)工艺 组合逻辑 时序逻辑 总剂量(TID)效应 标准单元
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Establishment and characterization of a continuous marine fish fin cell line from Epinephelus fuscoguttatus and viral susceptibility to crustacean CMNV 认领 引用
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作者 Ting XUE Yue ZHANG +3 位作者 Zhenxin ZHAO Yaru LI Jinwu WANG Huarong GUO 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2025年第3期892-905,共14页
Fish cell line provide a useful tool for studies in virology and molecular biology.To establish a novel continuous marine fish cell line(EFF)from caudal fin tissue of brown-marbled grouper Epinephelus fuscoguttatus,it... Fish cell line provide a useful tool for studies in virology and molecular biology.To establish a novel continuous marine fish cell line(EFF)from caudal fin tissue of brown-marbled grouper Epinephelus fuscoguttatus,its susceptibility to the crustacean covert mortality nodavirus(CMNV)was evaluated.The primary cell cultures were initiated first by incomplete digestion of fin tissue blocks with dispase and collagenase,and then the explant was cultured in L-15 medium supplemented with 20%fetal bovine serum,10%grouper muscle extract,and 20-ng/mL growth factors of basic fibroblast growth factor(bFGF)and epidermal growth factor(EGF).The EFF cells were continuously passaged beyond 50 times in fibroblast-like morphology,and they grew well in L-15 medium supplemented with a lower concentration fetal bovine serum(10%)at 28℃ after passage 10,without muscle extract and the growth factors.In addition,their grouper origin was confirmed by chromosome analysis and cytochrome oxidase 1(CO 1)gene analysis of these EFF cells.Transfection experiment via lipofectamine 8000 indicated that the EFF cells had a high transfection potential with a transfection efficiency up to 32%.Cross-species viral susceptibility analysis showed that CMNV not only successfully infected the EFF cells as evidenced by obvious cytopathic effects like vacuolation,detachment and death of cells,but also multiplied in the EFF cells as indicated by the results of semi-quantitative RT-PCR in transmission electron microscopy.Therefore,the establishment of immortal EFF cell line provided a useful cell model for future works on the isolation,multiplication,and pathogenic mechanism of cross-species infection of CMNV as well as genetic manipulation. 展开更多
关键词 Epinephelus fuscoguttatus fish cell line(EFF) caudal fin transfection covert mortality nodavirus(CMNV) cross-species infection
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Dynamic load characteristics and wake vortex structure of spiral finned cylinders in cross-flow 认领 引用
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作者 Hewei Yang Bowen Tang +1 位作者 Ye Tian Wei Tan 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第6期105-115,共11页
In this study,four types of spiral fins with varying parameters were mounted on an upstream cylinder,and the effects of spiral fins on the vibration response of heat exchange tubes and the vortex structure in cross fl... In this study,four types of spiral fins with varying parameters were mounted on an upstream cylinder,and the effects of spiral fins on the vibration response of heat exchange tubes and the vortex structure in cross flow were studied through experiments and numerical simulations.The results indicate a strong dependency of the cylinder's vibration response on the fin parameters.The results indicate that the vibration response and wake structure of the cylinder are significantly influenced by the parameters of the fins.The introduction of a finned cylinder affects both its own vibration amplitude and frequency,as well as the downstream cylinder.The amplitudes of finned cylinders Ⅰ and Ⅲ are reduced by 57.8% and 59.9%,respectively,compared to the bare cylinder.This reduction helps to restrain vibration and diminishes the amplitudes of the downstream cylinder.Although finned cylinder Ⅱ slightly decreases its own vibration,it increases the amplitude of the downstream cylinder by 13.7%.The mean drag coefficient and the root mean square of the lift coefficient of the finned cylinder are higher than those of the bare cylinder when the finned cylinder is positioned upstream.Smaller pitch and larger equivalent diameter will lead to increased drag,resulting in enhanced vortex shedding in the wake,which amplifies the vibrations of the cylinder in that wake.The downstream of finned cylinder Ⅱ has the widest wake and higher vortex strength,and the dynamic load and vibration of the downstream cylinder are increased.The vortex intensity decays faster in the wake of finned cylinder Ⅲ,and the vibration of the downstream cylinder is weaker. 展开更多
关键词 Computational fluid dynamics(CFD) Finned cylinder Large-eddy simulation(LES) Numerical simulation Turbulence
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Analysis of convective-radiative heat transfer in dovetail longitudinal fins with shape-dependent hybrid nanofluids:a study using the Hermite wavelet method 认领 引用 被引量：2
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作者 C.G.PAVITHRA B.J.GIREESHA +1 位作者 S.SUSHMA K.J.GOWTHAM 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第2期357-372,共16页
A distinguished category of operational fluids,known as hybrid nanofluids,occupies a prominent role among various fluid types owing to its superior heat transfer properties.By employing a dovetail fin profile,this wor... A distinguished category of operational fluids,known as hybrid nanofluids,occupies a prominent role among various fluid types owing to its superior heat transfer properties.By employing a dovetail fin profile,this work investigates the thermal reaction of a dynamic fin system to a hybrid nanofluid with shape-based properties,flowing uniformly at a velocity U.The analysis focuses on four distinct types of nanoparticles,i.e.,Al2O3,Ag,carbon nanotube(CNT),and graphene.Specifically,two of these particles exhibit a spherical shape,one possesses a cylindrical form,and the final type adopts a platelet morphology.The investigation delves into the pairing of these nanoparticles.The examination employs a combined approach to assess the constructional and thermal exchange characteristics of the hybrid nanofluid.The fin design,under the specified circumstances,gives rise to the derivation of a differential equation.The given equation is then transformed into a dimensionless form.Notably,the Hermite wavelet method is introduced for the first time to address the challenge posed by a moving fin submerged in a hybrid nanofluid with shape-dependent features.To validate the credibility of this research,the results obtained in this study are systematically compared with the numerical simulations.The examination discloses that the highest heat flux is achieved when combining nanoparticles with spherical and platelet shapes. 展开更多
关键词 Hermite wavelet method radiation convection dovetail fin nanoparticle configuration
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Experimental and Numerical Study on Flow and Heat Transfer Characteristics in Rectangular Channels with Leaf-Shaped Pin Fins 认领 引用 被引量：1
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作者 Chao Zhang Runze Yan +2 位作者 Honghui Li Qingheng Tang Qinghai Zhao 《Frontiers in Heat and Mass Transfer》 EI CAS 2025年第2期421-440,共20页
The growing need for enhanced heat dissipation is compelling the development of more effective heat exchangers.Innovation inspired by nature bionics,four types of leaf-shaped pin fins were proposed and four combinatio... The growing need for enhanced heat dissipation is compelling the development of more effective heat exchangers.Innovation inspired by nature bionics,four types of leaf-shaped pin fins were proposed and four combinations of them were considered.The leaf-shaped design of the cooling pin fin enhances uniformity and synergy,effectively creating an optimized flow path that boosts cooling performance.Eight three-dimensional conjugate heat transfer models in staggered arrangement were developed using ANSYS-Fluent software.Aluminum6061material was used as the heat sinkmaterial and single-phase liquid water flowed through the rectangular channel where the Reynolds(Re)number varies from 40 to 100.Using the same boundary conditions as the software simulations,two leaf-shaped channels were printed to validate numerical models.Velocity field and temperature differences of the eight proposed leaf-shaped pin fins configurations were discussed by comparison with cylindrical pin fins.Based on the findings of this study,at a Reynolds number of 80,the Leaf B Staggered Array(LBSA)records a maximum temperature that is 0.72 K lower than that of the cylindrical pin fins arrangement.Additionally,the LBSA exhibits a reduction in the friction factor by approximately 33.3%relative to the circular pin fins array under the same Re.This implies that the design of LBSA has been optimized to provide better heat dissipation performance while maintaining lower energy consumption.Furthermore,the LBSA demonstrates the most favorable thermal-hydraulic performance index(TPI),which is 1.18 times higher than that of the circular pin fins arrangement at Re=80.The temperature reduction and friction factor reduction of the lobed channel is more pronounced than that of the conventional cooling channel,highlighting its potential to increase heat transfer efficiency and reduce energy consumption in practical applications. 展开更多
关键词 Heat transfer enhancement leaf-shaped pin fins rectangular channel single-phase heat transfer staggered arrangement
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Novel method for assessment of thermal performance of louvered fin and flat tube heat exchangers 认领 引用 被引量：1
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作者 Qin Zhou Shengfei Liu Guoqing Hu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2025年第6期25-35,共11页
This study presents a simplified numerical approach for evaluating the thermal performance of louvered fin and flat tube heat exchangers(LFFTHXs),which are critical in many thermal management applications but difficul... This study presents a simplified numerical approach for evaluating the thermal performance of louvered fin and flat tube heat exchangers(LFFTHXs),which are critical in many thermal management applications but difficult to model due to their complex geometries.The proposed method uses an equivalent convective heat transfer coefficient to represent the fins,significantly reducing the computational requirements of the simulations.Validation against the effectiveness-number of transfer units method showed average deviations of 4.4%for the novel louvered fin with two combined holes and 9.5%for conventional configurations,confirming the accuracy of the method.Further application to two-phase refrigerant scenarios using experimental data demonstrated the robustness of the method and its suitability for practical design and optimization of LFFTHXs.The approach not only improves the feasibility of thermal analysis in industrial applications but also provides a foundation for future research into more efficient heat exchanger designs. 展开更多
关键词 Convective heat transfer Louvered fins Flat tube heat exchanger Thermal performance Numerical model
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NACA Airfoils as Proposal for Heat Sink Fins: Optimization Investigation 认领 引用
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作者 J.Luis Luviano-Ortiz Julio Cesar Rodriguez-Mosqueda +2 位作者 Salvador Botello-Aceves Yanan Camaraza-Medina Abel Hernandez-Guerrero 《Frontiers in Heat and Mass Transfer》 EI CAS 2025年第4期1165-1183,共19页
This work presents a simulation analysis using a multi-objective evolutionary algorithm for the thermo-hydraulic behavior of staggered heat sinks whose fins have NACA 0040 airfoil profile.The results were compared wit... This work presents a simulation analysis using a multi-objective evolutionary algorithm for the thermo-hydraulic behavior of staggered heat sinks whose fins have NACA 0040 airfoil profile.The results were compared with a conventional pin fin heat sink with a circular profile.This study searched for the best thermo-hydraulic performance by translational and rotational positioning of the fins.It is worth mentioning that this work was carried out in two stages.In the first stage,the thermo-hydraulic behavior of the heat sink was studied moving the location of the upper array above the X-axis from to 2.25 mm and above the Y-axis from to 1.275 mm.The second stage examined-2.25-1.55the effects of fin rotation considering the results found in stage 1.However,in this second stage,both arrays were free to rotate.For the upper array,the rotation range was-25°to 25° and for the lower array the rotation range was-15° to 15°.It is worth mentioning that both stages were analyzed for a single Reynolds(Re)number value of 13,000.The optimization results using the multi-objective evolutionary algorithm showed that compared to a NACA 0040 heat sink with fixed,unrotated original configuration(C0),the NACA 0040 heat sink with any Position Configuration(PC)did not significantly improve the heat transfer.Then,the results found in the second stage showed that the effect of the rotation of both sets did not influence the increase in pressure drop.However,it was found that with the Optimal Position and Rotation Configuration(PRCoptimal),which is the optimized array from Stage 1(position)then optimized by rotation,there is a slightly higher Performance Evaluation Criterion(PEC)compared to the original C0 configuration by 7%.Finally,the proposed NACA 0040 heat sink with the optimal rotation and position setting(PRCoptimal)was found to have a PEC of 9%compared to a conventional pin fin heat sink. 展开更多
关键词 NACA airfoil fins optimization simulation multiphysics performance evaluation criterion(PEC)
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Lift fin stabilizers based on data fusion with wavelet denoising technology 认领 引用 被引量：1
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作者 Yanhua LIANG Kai XUE Hongzhang JIN 《控制理论与应用（英文版）》 2010年第4期485-490,共6页
Fin stabilizers with fin-lift feedback control can shield the mapping error of calculation between the fin angle and fin lift force,which is in the fin stabilizer with fin-angle feedback control.In practice,there are ... Fin stabilizers with fin-lift feedback control can shield the mapping error of calculation between the fin angle and fin lift force,which is in the fin stabilizer with fin-angle feedback control.In practice,there are some technical difficulties in lift fin stabilizers,such as lift force detection and lift force sensor installation,so it cannot achieve the good antirolling performance.Therefore,a fin stabilizer system with fin-lift/fin-angle integrated control is brought forward.Data fusion based on wavelet denoising technology is employed in the system,which combines lift with fin angle local information from two sensors with different frequency ranges in order to eliminate redundant and contradictory information,and using complementary information to obtain the relative integrity of the lift force signal.The system model is established in this paper,and the fusion signal and the antirolling performance of this model are simulated respectively.The result shows that the control system can meet the antirolling need in different sea situations. 展开更多
关键词 Fin-angle feedback control Fin-lift feedback control Wavelet denoising Data fusion Fin stabilizers
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Effect of Fin Spacing on Frost Growth and Airflow Dynamics in ASHP Evaporators 认领 引用
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作者 Zhengqing Zhang Xiaojun Yuan Hui Wu 《Fluid Dynamics & Materials Processing》 EI 2025年第12期2927-2943,共17页
Frost accumulation on the evaporator fins of air source heat pumps(ASHPs)severely degrades heat transfer performance and overall system efficiency.To address this,the present study employs computational fluid dynamics... Frost accumulation on the evaporator fins of air source heat pumps(ASHPs)severely degrades heat transfer performance and overall system efficiency.To address this,the present study employs computational fluid dynamics(CFD)to investigate how fin spacing influences frosting behavior,emphasizing the coupled evolution of frost thickness,density,airflow,and temperature distribution within fin channels.Results reveal that fin spacing is a key parameter governing both the extent and rate of frost growth.Wider fin spacing enhances frost accumulation,with a final frost mass of 6.41 g at 12 mm,about 71.8%higher than at 4 mm.In contrast,narrower spacing suppresses frost formation by accelerating airflow.The frost layer exhibits a distinct two-stage growth pattern:at 12 mm spacing,the early-stage average thickness growth rate reaches 0.021 mm/min,nearly 4.3 times that at 4 mm.Frost density follows similar initial trends across different spacings but diverges later due to thermal resistance and airflow variations. 展开更多
关键词 Frosting behavior air-source heat pump evaporators fin spacing cold surface
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基于LSTM的FINS协议模糊测试用例生成方法 认领 引用
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作者 顾俊杰 虞闯 +1 位作者 陶耀东 孙永超 《科学技术创新》 2025年第7期44-47,共4页
采用传统模糊测试框架进行FINS协议的测试用例生成和测试结果反馈时,存在协议测试效率低下问题,测试准确度不高以及漏洞的发现时间长的问题。因长短期记忆(Long Short-Term Memory,LSTM)网络可以更好地捕捉时序数据中的长期依赖关系,所... 采用传统模糊测试框架进行FINS协议的测试用例生成和测试结果反馈时,存在协议测试效率低下问题,测试准确度不高以及漏洞的发现时间长的问题。因长短期记忆(Long Short-Term Memory,LSTM)网络可以更好地捕捉时序数据中的长期依赖关系,所以本文提出一种基于LSTM的FINS协议模糊测试用例生成方法。通过学习FINS协议中的特征位,生成符合协议基本规范的测试用例,减少无效测试时间。本实验对于不同字段进行模糊处理,实验结果表明,优化后的有效测试用例占比相较于之前提升了24%。 展开更多
关键词 长短期记忆神经网络 FINS协议 模糊测试 漏洞挖掘
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