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Low SO_2 emission from CFB co-firing MSW and bituminous 认领 引用 被引量：1
1
作者 LUQing-gang LIZhi-wei NAYong-jie BAOShao-lin SUNYun-kai HEJun 《Journal of Environmental Sciences》 SCIE EI CAS 2004年第5期821-824,共4页
Influence of co-firing rate on SO 2 emission from co-firing municipal solid waste(MSW) and bituminous containing high amount of sulfur(1.79%) was studied in a 0.15 MWt circulating fluidized bed(CFB). The temperature s... Influence of co-firing rate on SO 2 emission from co-firing municipal solid waste(MSW) and bituminous containing high amount of sulfur(1.79%) was studied in a 0.15 MWt circulating fluidized bed(CFB). The temperature selected is 1123 K, typical for MSW incineration using CFB. The particle concentration in the dilution zone of the furnace, the alkali metal concentration and sulfate concentration in the recirculating ash and fly ash, and flue gas composition were determined. The results showed that the addition of MSW leads to a significant decrease in SO 2 emission. Concentration of SO 2 in flue gas decreased to 0 with the co-firing rate greater than 51%. This reduction in SO 2 emission is attributed both to the high particle concentration in the dilution zone of the furnace, the high content of alkali metals in the bed material, and to the comparatively high concentration of HCl in flue gas during co-firing of MSW and bituminous. 展开更多
关键词 co-firing municipal solid waste bituminous CFB SO 2
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Multi-Phase Flow and Heat Transfer of a Micro-Pump Thermally Driven by a Multi-Output Pulse Laser 认领 引用 被引量：1
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作者 淮秀兰 唐志伟 +1 位作者 王国祥 王唯威 《Chinese Physics Letters》 SCIE EI CAS 2005年第2期398-401,共4页
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Experimental investigation of bioheat transfer characteristics induced by pulsed-laser irradiation 认领 引用
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作者 XiulanHuai JingYang +2 位作者 BaoziSun XiuliZhang DengyingLiu 《Journal of University of Science and Technology Beijing》 2003年第5期64-68,共5页
An experimental study of bioheat transfer characteristics induced bypulsed-laser irradiation was presented. The heat transfer characteristics of bio-materials, and theinfluences of pulse duration, power density, speci... An experimental study of bioheat transfer characteristics induced bypulsed-laser irradiation was presented. The heat transfer characteristics of bio-materials, and theinfluences of pulse duration, power density, species of bio-materials, thickness and initialmoisture content of bio-materials on heat transfer were studied in details. The experimental resultsindicate that the penetration and absorption of laser in bio-materials are considerable, the heattransfer inside the bio-materials should include the effects of volumetric absorption, pulseduration, power density, bio-materials thickness, and material species have a significant influenceon the temperature variation. 展开更多
关键词 pulsed-laser bio-materials heat transfer characteristic temperaturemeasurement
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Non-classical diffusion model for heat and mass transfer in laser drying 认领 引用
4
作者 XiulanHuai GuoxiangWang +1 位作者 RenqiuJiang BinLi 《Journal of University of Science and Technology Beijing》 2004年第5期455-461,共7页
A numerical analysis of the laser drying process by employing a generalized,Maxwell-Cattaneo equation to treat both heat and mass transfer was presented. Calculations wereperformed to illustrate the non-classical tran... A numerical analysis of the laser drying process by employing a generalized,Maxwell-Cattaneo equation to treat both heat and mass transfer was presented. Calculations wereperformed to illustrate the non-classical transport of heat and moisture. The effect of the heatflux density and the initial moisture content on water removal was also investigated. The resultsindicate that the non-equilibrium mass diffusion plays an important role during the very earlystages of moisture removal, especially at the surface of the medium. Away from the surface, thenon-Fickian model shows a delay in the reduction of the moisture content. The calculation resultsalso show that the initial moisture content of the medium has a considerable effect on waterremoval. 展开更多
关键词 laser drying porous media non-classical diffusion Maxwell-Cattaneoequation
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Electrical Capacitance Tomography Measurement of Flow Patterns and Film Thickness in a Thermosyphon 认领 引用 被引量：4
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作者 JingtaoLI QiCHEN +1 位作者 XiangyuanDONG ShiLIU 《Journal of Thermal Science》 SCIE EI CAS 2005年第1期81-86,共6页
An experimental study was performed to evaluate the suitability of using an electrical capacitance tomography (ECT) system to visualize the flow patterns, and to measure the film thickness of the annular flow in a two... An experimental study was performed to evaluate the suitability of using an electrical capacitance tomography (ECT) system to visualize the flow patterns, and to measure the film thickness of the annular flow in a two-phase closed thermosyphon (TPCT). The performance of the ECT system was examined over a range of flow conditions.The experimental data were compared with the visual observations and existing correlations. Results indicated that the ECT system, with the linear back projection (LBP) algorithm, could be used to give an on-line qualitative image of the flow patterns. The Landweber iteration algorithm with optimal step length was implemented off-line to reconstruct high-resolution images. Then, the images were analyzed to obtain the film thickness of the annular flow. The experimental data compared well with the Nusselt's equation in low vapor velocity range, but showed an increasing deficiency with the increase of vapor velocity. 展开更多
关键词 thermosyphon electrical capacitance tomography film thickness flow pattern.
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Numerical Simulation of Heat Transfer in a Gas Solid Crossflow Moving Packed Bed Heat Exchanger 认领 引用 被引量：7
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作者 AnyuanLiu YufengDuan 《Journal of Thermal Science》 SCIE CAS 2001年第3期228-232,共5页
The mechanism of heat transfer in a crossflow moving packed bed heat transfer exchanger is analyzed and a two dimensional heat transfer mathematical model has been developed based on the two fluid model (TFM)approach,... The mechanism of heat transfer in a crossflow moving packed bed heat transfer exchanger is analyzed and a two dimensional heat transfer mathematical model has been developed based on the two fluid model (TFM)approach, in which both phases are considered to be continuous and fully interpenetrating.This model is solved by means of numerical method and the results are approximately in agreement with the experimental ones. 展开更多
关键词 numerical simulation heat transfer gas-solid moving packed bed.
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A Feasibility Study on ECT Monitoring of Froth Molding of Polyurethane 认领 引用 被引量：2
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作者 QiCHEN ShiLIU XiangyuanDONG 《Journal of Thermal Science》 SCIE EI CAS 2005年第1期92-96,共5页
This paper presents our recent experimental investigation on the feasibility of monitoring the froth molding, a special case of solidification process, of polyurethane by using electrical capacitance tomography. The m... This paper presents our recent experimental investigation on the feasibility of monitoring the froth molding, a special case of solidification process, of polyurethane by using electrical capacitance tomography. The major challenge is the extremely low solid density of the solidified material during the process due to the very large expansion ratio. Suitable calibration method is sought and adequate image reconstruction algorithm is applied for such a task. Different expansion modes have been observed during experiment and corresponding images reconstructed. This visualization technique clearly revealed the expansion process by a time series of images of the solid density. The test results proved the capability of electrical capacitance tomography in monitoring the expansion of polyurethane. Future ways for improvement are also suggested. 展开更多
关键词 electrical capacitance tomography froth molding.
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DPL Model Analysis of Non-Fourier Heat Conduction Restricted by Continuous Boundary Interface 认领 引用 被引量：1
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作者 JinangFangming LiuDengying 《Journal of Thermal Science》 SCIE CAS 2001年第1期69-73,共5页
Dual-phase lag (DPL) model is used to describe the non-Fourier heat conduction in a finite medium where the boundary at x=0 is heated by a rectangular pulsed energy source and the other boundary is tightly contactal w... Dual-phase lag (DPL) model is used to describe the non-Fourier heat conduction in a finite medium where the boundary at x=0 is heated by a rectangular pulsed energy source and the other boundary is tightly contactal with another medium and satisfies the continuous boundary condition. Numerical solution of thes kind of non-Fourier heat conduction is presented in this paper. The results are compared with those predicted by the hyperbolic heat conduction (HHC) equation. 展开更多
关键词 non-Fourier heat conduction dual-phase lag model numerics solution.
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Analysis of Cold Flowfield of Multi-Annular Opposed Jets 认领 引用
9
作者 H.F.Zhao G.C.Benelli 《Journal of Thermal Science》 SCIE CAS 1992年第2期135-139,共5页
The technique of the use of multi-annular opposed jets as different from using swirl and bluff body creates an excellent recirculation zone with desired size in a large space.The size of recirculation,the magnitude of... The technique of the use of multi-annular opposed jets as different from using swirl and bluff body creates an excellent recirculation zone with desired size in a large space.The size of recirculation,the magnitude of reverse velocity and turbulence intensity are much greater than those formed by bluff body.Factors affecting the flowfield include the velocity ratio of the opposed jets to the primary air J,the diameter and construction of the opposed jet ring,secondary air velocity and configuration,and confined or unconfined flow condition and so on.This method is a promising way for flame stabilization in combustion technology. 展开更多
关键词 multi-annular opposed jets cold flowfield
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Passive Control of Transonic Flow Fields with Shock Wave Using Non-equilibrium Condensation and Porous Wall 认领 引用 被引量：2
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作者 MasanoriTanaka Shigerumatsuo +3 位作者 ToshiakiSetoguchi Kenjikaneko Heuy-DongKim ShenYu 《Journal of Thermal Science》 SCIE EI CAS 2003年第2期126-131,共6页
When non-equilibrium condensation occurs in a supersonic flow field, the flow is affected by the latent heat released. In the present study, in order to control the transonic flow field with shock wave, a condensing f... When non-equilibrium condensation occurs in a supersonic flow field, the flow is affected by the latent heat released. In the present study, in order to control the transonic flow field with shock wave, a condensing flow was produced by an expansion of moist air on a circular bump model and shock waves were occurred in the supersonic parts of the fields. Furthermore, the additional passive technique of shock / boundary layer interaction using the porous wall with a cavity underneath was adopted in this flow field. The effects of these methods on the shock wave characteristics were investigated numerically and experimentally. The result obtained showed that the total pressure loss in the flow fields might be effectively reduced by the suitable combination between non-equilibrium condensation and the position of porous wall. 展开更多
关键词 compressible flow non-equilibrium condensation boundary layer flow control.
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Investigation of Enhanced Boiling Heat Transfer from Porous Surfaces 认领 引用 被引量：1
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作者 LinZhiping MaTongze 《Journal of Thermal Science》 SCIE CAS 1994年第4期250-256,共7页
Experimental investigations of boiling heat transfer from porous suffaces at atmospheric pressure were performed. The porous surfaces are plain tubes covered with metal screens, V-shaped groove tubes covered with scre... Experimental investigations of boiling heat transfer from porous suffaces at atmospheric pressure were performed. The porous surfaces are plain tubes covered with metal screens, V-shaped groove tubes covered with screens, plain tubes sintered with screens, and V-shaped groove tubes sintered with screens.The experimental results show that siatering metal screens around spiral V-shaped groove tubes can greatly improve the boiling heat transfer. The boiling hysteresis was observed in the experiment. This paper discusses the mechanism of the boiling heat transfer horn those kinds of porous surfaces stated above. 展开更多
关键词 enhanced heat transfer nucleate pool boiling film boiling critical heat flux boiling hysteresis.
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An Investigation of the Swirling Flow and Heat Transfer in a Duct 认领 引用 被引量：1
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作者 TuJianping GuWeizao 《Journal of Thermal Science》 SCIE CAS 1992年第1期19-23,共5页
This paper presents the results of experiments and numerical simulation of the turbulent swirling flow and heat transfer in a duct.The calculated results are in good agreement with data obtained by measurements.It is ... This paper presents the results of experiments and numerical simulation of the turbulent swirling flow and heat transfer in a duct.The calculated results are in good agreement with data obtained by measurements.It is found that the swirling flow promotes heat transfer to the wall of the duct;the swirl numbers are dependent upon the vane exit angles of the swirler,distance from the swirler and the duct Reynolds number.But the decay of swirling flow in streamwise direction is related to local Reynolds numbers and is independent of the swirler exit angle.The swirl flow characteristics presented in this paper may be used for engineering purposes. 展开更多
关键词 swirling flow duct flow heat transfer numerical simulation.
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Passive Control of Steady Condensation Shock Wave 认领 引用 被引量：1
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作者 ShigeruMatsuo ShenYu 《Journal of Thermal Science》 SCIE CAS 2000年第4期293-298,共6页
When condensation occurs in supersonic flow fields, the flow is affected by the latent heat released, and if the heat released exceeds a certain quantity, a condensation shock wave will occur There are many papers for... When condensation occurs in supersonic flow fields, the flow is affected by the latent heat released, and if the heat released exceeds a certain quantity, a condensation shock wave will occur There are many papers for the passive control of shock-boundary layer interaction using the porous wall with a plenum underneath on the application of the technique to transonic airfoil flows. In the present study, this passive technique is applied to the control of a steady condensation shock wave generated in a supersonic nozzle. In order to clarify the effect of the passive shockboundary layer control on condensation shock, Navier-Stokes equations were solved numerically using a 3rd-order MUSCL type TVD finite-difference scheme with a second-order fractional-step for time integration. As a result, the simulated flow fields were compared with experimental data in good agreement and the aspect of the flow field has been clarified. 展开更多
关键词 condensation shock wave passive control moist air numerical simulation.
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An Approximate Model of Microchannel Cooling 认领 引用
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作者 ShipingYu MingdaoXin 《Journal of Thermal Science》 SCIE CAS 1994年第4期243-249,共7页
Forced convective heat transfer in micro-rectangular channels can be described by a group of twodimensional differential equations. These equations take the conduction in microchannel wb along the direction of flow of... Forced convective heat transfer in micro-rectangular channels can be described by a group of twodimensional differential equations. These equations take the conduction in microchannel wb along the direction of flow of coolants into account, which are more generalized than those which neglect the conduction. For the same reason, they are suitable particularly for gases-cooled microchannels.With only numerical solution to the equations till today, an approximate analytic solution is derived here. From this solution, a rather simple formula can be introduced bober, by which the differences between considering the conduction and neglecting it are easily found. In addition, the rcasonableness of the classical fin method is also discussed. An experimental example of air-cooled microchannels is illustrated. 展开更多
关键词 forced convection microchannel heat trarefer approximate model anaiytic solution.
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Investigation of Boiling Heat Transfer of Binary Mixture from Vertical Tube Embedded in Porous Media 认领 引用
15
作者 HailongMo TongzeMa 《Journal of Thermal Science》 SCIE CAS 1996年第3期190-195,共6页
Ethanol-water binary mixtures with 7 different mole fractions of ethanol ranging from 0 to 1 were adopted as testing liquids in the experiment. The vertical heating tube was inserted in porous matrix composed of five ... Ethanol-water binary mixtures with 7 different mole fractions of ethanol ranging from 0 to 1 were adopted as testing liquids in the experiment. The vertical heating tube was inserted in porous matrix composed of five well sorted glass beads whose diameters range from 0.5 to 4.3 mm. Due to the effect of composition, the trend of combination of vapor bubbles was reduced, resulting in the increase of peak heat flux of binary mixture. With the increase of ethanol mole fraction, 0.5 mm diameter bead had lower value of peak heat flux, while for pure liquid the critical state is difficult to appear. With given diameter of glass bead, there existed an optimum value of mole fraction of ethanol, which was decreased with the increase of bead diameter. A dimensionless heat transfer coefficient was predicted through the introduction of a dimensionless parameter of porous matrix, which agreed with the experimental results satisfactorily. 展开更多
关键词 binary mixture dimensionless heat transfer coeffcient porous media
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A Prediction Model for Condensation on Single Horizontal Rectangular Fin Tube 认领 引用
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作者 LiuXijuan MaTongze 《Journal of Thermal Science》 SCIE CAS 1997年第1期27-34,共8页
A model was established to predict condensation heat transfer coefficient on horizontal rectangular-finned tube. Drop-Off zone at the tube bottom was considered and determined, the known Honda(and owen) expression of ... A model was established to predict condensation heat transfer coefficient on horizontal rectangular-finned tube. Drop-Off zone at the tube bottom was considered and determined, the known Honda(and owen) expression of retention angle was also modified as a result of considering drop-off zone.Heat flux on fin tips in the unflooded region, fin fianks, fin spacings and fin tips in the flooded regionwere analyzed respectively. Condensation on fin tips is emphasized by considering the variation of filmthickness along circumference as well as horizootally. Fin efficiency was considered in calculation. Theprediction results were compared with several researchers’ experimental data for three kinds of workingfluids on seven different tube geometries and for various temperature differences. These data underabout 60 test conditions were predicted with discrepancy of ±10%. Prediction by the present modelfor steam and R-113 condensation were compared with previous models. 展开更多
关键词 condensation finned tube
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Heat and Momentum Transport in Micro-Channels 认领 引用
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作者 SunHongwei GuWeizao 《Journal of Thermal Science》 SCIE CAS 1998年第1期43-48,共6页
Effect of velocity jump and temperature jump on the heat and momentum transfer in micro-domains is discussed in detail. A simulation aided by locally fully developed assumption is developed to ex-plain the experimenta... Effect of velocity jump and temperature jump on the heat and momentum transfer in micro-domains is discussed in detail. A simulation aided by locally fully developed assumption is developed to ex-plain the experimental results different from those predicted by conventional theory. Heat transfer in microrchannels under the uniform heat flux is also analyzed. It is found that velocity-jump and temperature-jump have an opposite innuence and Nusselt number has a greater ralue when the Knud-sen number is very small. With the increasing of Knudsen Number, Nusselt number became smaller than 8.24. 展开更多
关键词 heat and momentum transfer micro-channel
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Study on Characteristics of Different Types of Nozzles for Coal-Water Slurry Atomization 认领 引用 被引量：2
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作者 KunYuan LifangChen 《Journal of Thermal Science》 SCIE CAS 2001年第4期331-335,共5页
Three types of nozzles: a low-pressure multistage nozzle, an effervescent nozzle and a newly developed internal- mixing air-blast nozzle, for atomization of Coal-Water Slurry (CWS) were investigated. Influence of CWS ... Three types of nozzles: a low-pressure multistage nozzle, an effervescent nozzle and a newly developed internal- mixing air-blast nozzle, for atomization of Coal-Water Slurry (CWS) were investigated. Influence of CWS properties including surface tension and apparent viscosity on atomization was studied. Comparisons among the nozzles were carried out in terms of spray droplet mean diameter and fuel output. Versatility of each nozzle was investigated and atomization mechanism of each nozzle was analyzed as well. The results showed that the newly developed internal- mixing air-blast nozzle has high fuel output and small mean droplet size in the spray, but the multistage nozzle has high versatility for handling of low quality CWS. 展开更多
关键词 CWS coal-water slurry atomization nozzle.
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Experimental Study of Twin Pulse Jet Engines for Power Plant Application 认领 引用
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作者 ToshihiroNakano Shigerumatsuo +1 位作者 ToshiakiSetoguchi ShenYu 《Journal of Thermal Science》 SCIE EI CAS 2003年第2期179-184,共6页
The total efficiency of power plants depends on the energy conversion in a combustor and a turbine .Considerably higher energy transfer rates can be obtained from a pulsed combustion.but unsteady flow of a single jet ... The total efficiency of power plants depends on the energy conversion in a combustor and a turbine .Considerably higher energy transfer rates can be obtained from a pulsed combustion.but unsteady flow of a single jet combustor reduces the turbine efficiency.Therefore.two pulse combustors were set in parallel and connected to a settling chamber that supplies a flow with constant pressure to the turbine.The aim of investigations presented here is a demonstration of technical feasibility for industrial applications and to show the benefits obtained from the pulse combustors. 展开更多
关键词 twin pulse combustion compressible flow control.
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Passive Control of Unsteady Condensation Shock Wave 认领 引用
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作者 ToshiakiSetoguchi ShenYu 《Journal of Thermal Science》 SCIE CAS 2000年第4期299-304,共6页
A rapid expansion of moist air or steam in a supersonic nozzle gives rise to nonequilibrium condensation phenomena. Thereby, if the heat released by condensation of water vapour exceeds a certain quantity, the flow wi... A rapid expansion of moist air or steam in a supersonic nozzle gives rise to nonequilibrium condensation phenomena. Thereby, if the heat released by condensation of water vapour exceeds a certain quantity, the flow will become unstable and periodic flow oscillations of the unsteady condensation shock wave will occur. For the passive control of shock-boundary layer interaction using the porous wall with a plenum underneath, many papers have been presented on the application of the technique to transonic airfoil flows. In this paper, the passive technique is applied to three types of oscillations of the unsteady condensation shock wave generated in a supersonic nozzle in order to suppress the unsteady behavior As a result, the effects of number of slits and length of cavity on the aspect of flow field have been clarified numerically using a 3rd-order MUSCL type TVD finite-difference scheme with a second-order fractional-step for time integration. 展开更多
关键词 unsteady condensation shock wave passive control moist am numerical simulation
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