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首页> 外文期刊>Journal of Heat Transfer >The Role of the Shear Work in Microtube Convective Heat Transfer: A Comparative Study
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The Role of the Shear Work in Microtube Convective Heat Transfer: A Comparative Study

机译：剪切工作在微管对流换热中的作用：比较研究

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摘要

Convective heat transfer of a thermally developing rarefied gas flow in a microtube with boundary shear work, viscous dissipation, and axial conduction is analyzed numerically for both constant wall temperature (CWT) and constant wall heat flux (CHF) boundary conditions. Analytical solutions for the fully developed flow conditions including the boundary shear work are also derived. The proper thermal boundary condition considering the sliding friction at the wall for the CHF case is implemented. The sliding friction is also included in the calculation of the wall heat flux for the CWT case. A comparative study is performed to quantify the effect of the shear work on heat transfer in the entrance-and the fully developed-regions for both gas cooling and heating. Results are presented in both graphical and tabular forms for a range of problem parameters. The results show that the effect of shear work on heat transfer is considerable and it increases with increasing both the Knudsen number and Brinkman number. Neglecting the shear work in a microtube slip flow leads to over- or underestimating the Nusselt number considerably. In particular, for the CWT case with fully developed conditions, the contribution of the shear work to heat transfer can be around 45% in the vicinity of the upper limit of the slip flow regime, regardless of how small the nonzero Brinkman number can be.
机译：在恒定壁温（CWT）和恒定壁热通量（CHF）边界条件下，对具有边界剪切功，粘性耗散和轴向传导的微管中热发展的稀薄气流的对流传热进行了数值分析。还导出了包括边界剪切功在内的充分发展的流动条件的解析解。在考虑到CHF情况下，考虑壁的滑动摩擦，实现了适当的热边界条件。滑动摩擦力也包括在CWT情况下壁热通量的计算中。进行了一项比较研究，以量化剪切功对气体冷却和加热的入口区域和完全发达区域中的热传递的影响。结果以图形和表格形式显示了一系列问题参数。结果表明，剪切功对热传递的影响相当大，并且随着努氏数和布林克曼数的增加而增加。忽略微管滑流中的剪切功会导致高估或低估Nusselt数。特别是，对于具有充分发展条件的CWT情况，无论非零布林克曼数有多小，在滑流状态上限附近，剪切功对热传递的贡献都可以达到45％左右。

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