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首页> 外文期刊>International Journal of Heat and Mass Transfer >Rarefaction and dissipation effects on transport phenomena associated with an immiscible two-phase flow within a shaft-housing micro configuration
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Rarefaction and dissipation effects on transport phenomena associated with an immiscible two-phase flow within a shaft-housing micro configuration

机译：在竖井式壳体微结构中，回流和耗散对与不相溶的两相流有关的传输现象的影响

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摘要

A parametric analytical study is performed to investigate the mechanism of fluid flow and heat transfer associated with an immiscible gas-liquid flow within a shaft-housing micro configuration. The incompressible Navier-Stokes-Fourier (NSF) equations in the cylindrical polar coordinate reference frame are employed, while simultaneous effects of viscous dissipation and rarefaction phenomenon are taken into account. Two different classical thermal boundary conditions, namely, the Uniform Heat Flux (UHF) and the Constant Wall Temperature (CWT) boundary conditions are considered. Throughout a combination of these boundary conditions three thermal case studies are constructed and then treated separately. Solutions for the velocity and temperature distributions for both liquid and gas phases of each thermal case are obtained. Employing these solutions, major quantities such as shear and temperature reductions at the shaft due to the gas layer and the Nusselt number pertained to the gas and liquid phases are evaluated. Effects of parameters such as the Knudsen and Brinkman numbers as well as the aspect ratio of the annuli on the aforementioned major variables are examined. The results indicate that introducing a gas layer into the micro domain always contributes to decreasing the shear stress at the shaft and consequently, reducing the torque required to initiate the flow, which is absolutely desirable. However, depending on the thermal case considered, this may be accompanied by serious thermal drawbacks like higher temperatures at the shaft surface. It is also found that increasing values of the Knudsen and Brinkman numbers may even deteriorate the situation.
机译：进行了参数分析研究，以研究与轴壳微结构中不溶混的气液流相关的流体流动和传热机理。使用圆柱极坐标参考系中的不可压缩的Navier-Stokes-Fourier（NSF）方程，同时考虑了粘性耗散和稀疏现象的同时影响。考虑了两种不同的经典热边界条件，即均匀热通量（UHF）和恒定壁温（CWT）边界条件。在所有这些边界条件的组合中，构建了三个热学案例研究，然后分别进行了处理。获得了每种热工况下液相和气相的速度和温度分布的解。使用这些解决方案，可以评估大量因素，例如由于气体层和与气相和液相有关的努塞尔数导致的竖井中的剪切和温度降低。研究了诸如Knudsen和Brinkman数之类的参数以及环的长宽比对上述主要变量的影响。结果表明，将气体层引入微区总是有助于减小轴上的剪切应力，因此，减小了启动流动所需的扭矩，这是绝对希望的。但是，根据所考虑的热工况，可能会伴有严重的热缺陷，例如轴表面温度较高。还发现增加Knudsen和Brinkman数的值甚至可能使情况恶化。

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