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首页> 外文期刊>Heat transfer >Prediction of flow and heat transfer through a microtube filled with bidisperse porous medium under local thermal nonequilibrium condition
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Prediction of flow and heat transfer through a microtube filled with bidisperse porous medium under local thermal nonequilibrium condition

机译：在局部热非平衡条件下通过充满双分散多孔介质的微管的流动和热传递的预测

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摘要

In this paper, the thermal and hydrodynamic solutions of a microtube filled with bidisperse porous medium (BDPM) under the local thermal nonequilibrium (LTNE) condition are presented. Considering the LTNE condition, the energy equations have been numerically solved. The rarefaction effects are considered for Knudsen numbers ranging from 0 to 0.1; therefore, first-order boundary condition is applied on the wall. The temperature distribution of each phase is examined with respect to the involved parameters in the BDPM system. For the first time, the Nusselt number ratio (NRDP) is introduced to study the influence of Darcy number on the Nusselt number more precisely. Also, the effect of different thermophysical parameters on the Nusselt number is studied. The advantage of BDPM system over monodisperse porous medium (MDPM) structure is examined through the heat transfer performance parameter. The findings exhibit a good agreement with the literature. Also, the LTNE condition produces more realistic results in comparison to local thermal equilibrium assumption. On the whole, although implementing the BDPM enhances the heat transfer rate compared with the MDPM, it does not improve the thermal hydrodynamic performance significantly.
机译：本文提出了在局部热不平衡（LTNE）条件下填充双分散多孔介质（BDPM）的微管的热力学和流体力学解决方案。考虑到LTNE条件，已经对能量方程进行了数值求解。考虑努氏数在0到0.1之间的稀疏效应。因此，一阶边界条件应用于墙。相对于BDPM系统中涉及的参数检查每个相的温度分布。首次引入了Nusselt数比（NRDP），以更精确地研究Darcy数对Nusselt数的影响。此外，研究了不同热物理参数对努塞尔数的影响。通过传热性能参数检查了BDPM系统相对于单分散多孔介质（MDPM）结构的优势。这些发现与文献显示出很好的一致性。而且，与局部热平衡假设相比，LTNE条件产生了更实际的结果。总体而言，尽管与MDPM相比，实施BDPM可以提高传热速率，但并不能显着改善热流体动力学性能。

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