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王秋旺, Q. W. Wang, W. Q. Tao, Z. Lin, T. T. Chow
Journal of Heat Transfer FEBRUARY 2000, Vol. 122/171,-0001,():
-1年11月30日
Natural convection in a cubic inclined enclosure with three isolated plates was investigated experimentally. The influences of the plates' spacing, the inclination angles of the enclosure, and the Rayleigh number on the heat transfer of the plate group were obtained. It was found that under a fixed Rayleigh number, there is a plate spacing at which the heat transfer rate of the three plates is approximately the same for the horizontal plate group. Under the range of Rayleigh numbers considered, the heat transfer rate of the plate group is less than that of the natural convection of the plate group in infinite space. The heat transfer rate of the plates increases with the plate inclined angle tilting from θ=90 deg to θ=0 deg, with the most steep increase occurring in the range of θ=90 deg to 45 deg. A global correlation of the heat transfer results for all the inclination between 0 deg and 60 deg can be obtained as Nul,m=0.5360 (Ra1cos) 0.25 with a spread of ±8.9 percent.
Enclosure Flows,, Experimental,, Heat Transfer,, Natural Convection,, Steady
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【期刊论文】Simulation of rarefied gas flow and heat transfer in microchannels
王秋旺, WANG Xian, WANG Qiuwang, TAO Wenquan & ZHENG Ping
SCIENCE IN CHINA (Series E) June 2002 Vol. 45 No.3,-0001,():
-1年11月30日
Analysis and simulation of rarefied nitrogen gas flow and heat transfer were performed with the Knusden number ranging from O.05 to 1.O, using the direct simulation of Monte Carlo (DSMC) method, The influences of the Kn number and the aspect ratio on the gas temperature and wall heat flux in the microchannels were studied parametrically. The total and local heat fluxes of the microchannel walls varying with the channel inlet velocities were also investigated in detail. It was found that the Kn number and the aspect ratio greatly influence the heat transfer performance of microchan-nels, and both the channel inlet and outlet have higher heat fluxes while the heat flux in the middle part of channels is very low. It is also found that the inlet free stream flow velocity has small affect on the wall total heat flux while it changes the distribution of local heat flux.
microchannel,, Kn number., DSMC,, fluid flow and heat transfer.,
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王秋旺, Huang Jun, Wang Q.W. and Tao W.Q.
Engineering Computations, Vol. 19 No.3, 2002, pp. 327-345.,-0001,():
-1年11月30日
A computational study of convective heat transfer for turbulent flows in multi-channel, narrow-gap fuel element has been carried out, using a general marching procedure. The fluid distribution adjustment among seven annular-sector channels is based on the assumption of the same pressure drop in these passages. It was found that the inlet velocities of the bilateral channels are lower than these of the middles, and the axial local heat transfer coefficients for the seven channels do not approach the fully developed constant value. At each cross section, the periphery temperature distribution is not uniform, while the local temperature distribution along axial coordinate is of sinuous type with the peak at x=0.7-0.8m. At the same Reynolds number, the averaged Nusselt numbers of water in Channel 1 and Channel 7 are higher than those in the middles. The maximum surface temperature increases almost linearly with the inlet water temperature, whereas it decreases almost asymptotically with the inlet average velocity.
Turbulent flow,, Heat transfer
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【期刊论文】DSMC simulation of low-speed gas flow and heat transfer in 2D rectangular micro-channel
王秋旺, He Qun wu and Wang Qiuwang, Wang Xian, Luo Laiqin
Progress in Computational Fluid Dynamics, Vol. 5, Nos. 3/4/5, 2005,-0001,():
-1年11月30日
Effective boundary condition is one of the most critical problems in the computation of micro-channel flows with direct simulation Monte-Carlo (DSMC) method. In the present work, the implementation of DSMC with specified pressure boundary condition (PBC) was discussed in detail. The variations of gaseous local pressure, temperature and number density of the particles caused by the temperature difference between channel walls and gas were presented. It was found that with the increase of both gaseous compressibility and rarefaction, the pressure distribution along micro-channel became more nonlinear. Heat transfer occurred almost only at channel inlet and outlet, and the average wall heat flux increased almost linearly to the inlet-to-outlet pressure ratio. The computational results also showed that PBC was more suitable for the simulation of micro-channel flow problems than the conventional velocity boundary condition (VBC).
DSMC, micro-channel low-speed gas flow, pressure boundary condition (, PBC), , velocity boundary condition (, VBC), .,
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王秋旺, 梁红侠, 彭波涛, 罗来勤, 丰镇平
工程热物理学报,2004,25(4):688~690,-0001,():
-1年11月30日
采用高效紧凑式换热器是近年来微型燃气轮机发展取得成功的关键技术之一。本文在燃机参数给定情况下,通过对三种换热表面进行热力计算和分析,结果表明,CC原表面在紧凑式换热器中具有较强的应用潜力。此外,还就温差对压损的影响及燃气旁通量对回热度的影响进行了研究。
微型燃气轮机, 换热器, 原表面, 回热循环
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