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首页> 外文期刊>Journal of nanoscience and nanotechnology >The Numerical Simulation of Liquid-Vapor Stratified Flow in Horizontal Metal-Foam Tubes
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The Numerical Simulation of Liquid-Vapor Stratified Flow in Horizontal Metal-Foam Tubes

机译：水平金属泡沫管液汽分层流动的数值模拟

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摘要

In this paper, a boiling stratified flow model in a metal-foam tube is proposed. First, based on Branuer non-equilibrium gas-liquid interface model, a force balance on the gas-liquid interface in metal-foam is calculated. The shape of the interface of upper gas phase and lower liquid phase in metal foam tube is obtained. As for the lower liquid phase, the energy conservation equations of liquid and metal foam are formulated, which account for porosity and fiber diameter of foam on the basis of non-local thermal equilibrium model (NTEM), respectively. Therefore, a profile of temperature difference between liquid and metal foam can be obtained. For the upper gas phase, an empirical correlation developed by other researchers is utilized to obtain temperature difference between gas phase and solid wall. In addition, the variation of the Reynolds number with increasing mass quality along the flow direction is acquired. Ultimately, an average circumference heat transfer coefficient is calculated. The results of circumference heat transfer coefficient agree well with available experimental data, showing the prediction of the proposed stratified flow model is feasible. The reason resulting in discrepancies between the prediction and experiment data is also illustrated.
机译：本文提出了金属泡沫管内沸腾分层流动模型。首先，基于布劳纳非平衡气液界面模型，计算了金属泡沫中气液界面上的力平衡。得到了金属泡沫管中上气相和下液相的界面形状。对于较低的液相，制定了液体和金属泡沫的能量守恒方程，分别基于非局部热平衡模型（NTEM）考虑了泡沫的孔隙率和纤维直径。因此，可以获得液体和金属泡沫之间的温度差的分布。对于上部气相，利用其他研究人员开发的经验相关性来获得气相和固体壁之间的温差。另外，获得了沿着流向随着质量质量增加的雷诺数的变化。最终，计算出平均圆周传热系数。圆周传热系数的计算结果与已有的实验数据吻合良好，表明所提出的分层流模型的预测是可行的。还说明了导致预测数据与实验数据之间差异的原因。

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