平板通道内填充多孔物块的优化换热分析
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摘要
采用数值模拟的方法,对恒热流壁面平板通道填充多孔物块的流动换热进行了相关研究,分别采用Brinkman-Forchheimer-Darcy流动模型和局部热平衡模型描述多孔介质内的流动和换热,重点研究了多孔物块的填充位置和物块高度对流动换热的影响.结果表明:当多孔物块在纵向上位于通道中心区域时,强化传热效果最好;随着填充多孔物块高度的增加,壁面Num数呈现先增大后减小的趋势,但流动阻力系数却不断增大.
The flow and heat transfer of the Parallel Plate Channel with constant heat-flux walls filled with porous blocks was relevantly studied by the numerical simulation method.By using the BrinkmanForchheimer-Darcy flow model and the local thermal equilibrium model.the flow and heat transfer in porous blocks was described.and the impact of the position of porous blocks and height of porous blocks on the flow and heat transfer was mainly studied.The results show that when porous blocks are longitudinally located in the central part of the channel.the heat transfer is maximized.and that with the increase of the height of porous blocks.the average Nu number on the inside wall increases at first and then decreases.but the flow resistance coefficient continually increases.
The flow and heat transfer of the Parallel Plate Channel with constant heat-flux walls filled with porous blocks was relevantly studied by the numerical simulation method.By using the BrinkmanForchheimer-Darcy flow model and the local thermal equilibrium model.the flow and heat transfer in porous blocks was described.and the impact of the position of porous blocks and height of porous blocks on the flow and heat transfer was mainly studied.The results show that when porous blocks are longitudinally located in the central part of the channel.the heat transfer is maximized.and that with the increase of the height of porous blocks.the average Nu number on the inside wall increases at first and then decreases.but the flow resistance coefficient continually increases.
引文
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[3]Prandtl L,Tietjens O G.Fundamentals of Hydro and Aeromechanics[M].New York:McGraw-Hill,1934.
[4]Tong T W,Sharatchandra M C.Using Porous Inserts Enhance Heat Transfer in Laminar Fully-developped Flows[J].International Communications in Heat and Mass Transfer,1993,20(6):761-770.
[5]张红军,邹正平,叶建,等.多孔材料填充方式对通道传热效果影响的数值研究[J].核动力工程,2011,32(5):83-88.
[6]Pavel B I,Mohamad A A.An Experimental and Numerical Study on Heat Transfer Enhancement for Gas Heat Exchangers Fitted with Porous Media[J].International Journal of Heat and Mass Transfer,2004,47(23):4 939-4 952.
[7]Sung H J,Kim S J,Hyun J M.Forced Convection from an Isolated Heat Source in a Channel with Porous Medium[J].International Journal of Heat and Fluid flow,1995,16(8):527-535.
[8]赵冰超,王良璧.等热流边界条件下扭曲方管内流动与传热特性数值分析[J].甘肃科学学报,2012,24(1):27-30.