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Microchannels enhanced by porous materials: Heat transfer enhancement or pressure drop increment?

机译：多孔材料增强的微通道：传热增强还是压降增加？

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摘要

The analytical heat transfer performance study (i.e. HTP, introduced as the ratio of the heat transfer rate enhancement to the pressure drop increment) for microchannels enhanced by a porous material is performed. The Darcy-Brinkman equation of motion and the two-energy equation model for heat transfer within the porous material (i.e. the local thermal non-equilibrium condition, LTNE) are used to find the Poiseuille (Po) and Nusselt (Nu) numbers in the slip-flow regime (i.e. when the Knudsen number, kn, < 0.1). To cover a wide range of heat exchangers, effects of hydrodynamical characteristics of the porous material (i.e. porosity, phi, and Darcy number, Da), the effective thermal conductivity ratio (k), the interphase convective heat exchange between the two phases (Bi), the velocity-slip and temperature jump coefficients (alpha and beta), the dimensionless thermal resistance of the walls (R-w), and the internal heat generations within the solid and fluid phases of the porous material (omega(f) and omega(s)) are considered. HTP maps are presented for a wide variation range of all pertinent parameters to design or to select a micro-heat exchanger according to the heat transfer enhancement with respect to the pressure drop cost. Results reveal that the HTP may effectively be increased by inserting rarefied porous inserts. The present analysis suggests the implementation of porous inserts within flow passages especially when 0.001 < Kn < 0.1 (the slip-flow regime). (C) 2015 Elsevier Ltd. All rights reserved.
机译：对由多孔材料增强的微通道进行了分析性传热性能研究（即HTP，以传热速率增强与压降增量之比的形式引入）。使用Darcy-Brinkman运动方程和多孔材料内部传热的两能量方程模型（即局部热非平衡条件LTNE）来查找多孔材料中的Poiseuille（Po）和Nusselt（Nu）数。滑流状态（即当克努森数kn <0.1时）。为了涵盖广泛的热交换器，多孔材料的流体动力学特性（即孔隙率，phi和达西数Da），有效导热系数（k），两相之间的相间对流换热（Bi ），速度滑移系数和温度跳跃系数（alpha和beta），壁的无量纲热阻（Rw）以及多孔材料的固相和液相内的内部发热（omega（f）和omega（ s））。提供了针对所有相关参数的较大变化范围的HTP映射，以根据相对于压降成本的传热增强来设计或选择微型热交换器。结果表明，通过插入稀疏多孔插入物可以有效提高HTP。目前的分析表明，在流动通道内应采用多孔插入物，特别是当0.001

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