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首页> 外文期刊>Journal of visualization >Thermal and flow characteristics of evaporating capillary pore flows ranging from 10-mm to 10-mu m diameter
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Thermal and flow characteristics of evaporating capillary pore flows ranging from 10-mm to 10-mu m diameter

机译:蒸发的毛细管孔的热和流量特性,直径范围为10mm至10μm

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摘要

Flow and thermal characteristics are studied for capillary pore cavities with free surfaces ranging from 10-mm to 10-mum diameter. Also the effect of micro gravity is investigated. A standard finite volume method (FVM), in association with the well-established boundary-fitted coordinate transformation (BFCT), is used to numerically solve the governing equations for primitive scalar variables of velocity components, pressure and temperature. Calculation results show that the convection-driven circulation and the thermocapillary phoresis effect dominate the flow and thermal fields of larger pores, bigger than 1.0-mm diameter. With decreasing pore diameter, the flow circulation diminishes and the interfacial evaporation dominates to establish nearly stratified flow patterns parallel to the pore wall. Micro-scale capillary pores, less than 1.0-mm diameter, show no flow circulation with almost horizontally stratified temperature fields. Micro gravity condition shifts this transition which is from convection-driven to interfacial flow dominated flow regime to bigger pore diameter.
机译:研究了自由表面直径在10毫米至10毫米范围内的毛细孔腔的流动特性和热特性。还研究了微重力的影响。标准的有限体积法(FVM)与完善的边界拟合坐标变换(BFCT)一起用于数值求解速度分量,压力和温度的原始标量变量的控制方程。计算结果表明,对流驱动的循环和热毛细管电泳效应主导着直径大于1.0毫米的较大孔的流动和热场。随着孔径的减小,流循环减少,界面蒸发起主导作用,建立了几乎平行于孔壁的分层流型。直径小于1.0毫米的微尺度毛细孔在几乎水平分层的温度场下没有流动循环。微重力条件将这种过渡从对流驱动转换为以界面流动为主的流动状态,然后转变为更大的孔径。

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