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首页> 外文期刊>Journal of Thermal Science and Engineering Applications: Transactions of the ASME >Numerical Analysis of Conjugated Convection-Conduction Heat Transfer in a Microtube Gas Flow
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Numerical Analysis of Conjugated Convection-Conduction Heat Transfer in a Microtube Gas Flow

机译：微管气流中共轭对流传热的数值分析

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摘要

Numerical solutions for conjugate heat transfer of a hydro-dynamically fully developed, thermally developing, steady, incompressible laminar gas flow in a microtube with uniform wall heat flux boundary condition are presented. The mathematical model takes into account effects of rarefaction, viscous dissipation, flow work, shear work, and axial conduction in both the wall and the fluid. The effect of the tube wall thickness, the wall-to-fluid thermal conductivity ratio, as well as other factors on heat transfer parameters is investigated, and comparisons with the case of zero wall thickness are presented as appropriate. The results illustrate the significance of heat conduction in the tube wall on convective heat transfer and disclose the significant deviation from those with no conjugated effects. Increasing the wall thickness lowers the local Nusselt number. Increasing the wall-to-fluid thermal conductivity ratio also results in lower Nusselt number. In relatively long and thick microtubes with high wall-to-fluid thermal conductivity ratio, the local Nusselt number exhibits minimum values in the entrance regions and at the end sections due to axial conduction effects. The analysis presented also demonstrate the significance of rarefaction, shear work, axial conduction, as well as the combined viscous dissipation and flow work effects on heat transfer parameters in a microtube gas flow. The combined flow work and viscous dissipation effects on heat transfer parameters are significant and result in a reduction in the Nusselt number. The shear work lowers the Nusselt number when heat is added to the fluid.
机译：提出了具有均匀壁热通量边界条件的微管中水流动态开发，热显影，稳定，不可压缩层气流的缀合物传热的数值溶液。数学模型考虑了稀疏，粘性耗散，流动工作，剪切工作和墙壁和流体轴向传导的影响。管壁厚度，壁 - 流体导热比以及传热参数上的其他因素的效果进行了研究，并且适当地呈现与零壁厚度的情况的比较。结果说明了导管壁上的热传导在对流传热上的意义，并公开了与没有缀合作用的那些的显着偏差。增加墙壁厚度降低了当地的营养数。增加壁到流体的导热比也导致较低的营养数。在具有高壁到流体导热率比的相对长的微管中，由于轴向传导效应，局部NUSEREL号码在入口区域和端部处表现出最小值。提出的分析还证明了稀疏，剪切工作，轴向传导以及组合粘性耗散和流动工作对微管气流中的传热参数的意义。对传热参数的组合流程和粘性耗散效应是显着的，导致营养数减少。当加热到液体时，剪切工作降低了露珠数。

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