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首页> 外文期刊>International Journal of Heat and Fluid Flow >Heat transfer characteristics of developing gaseous slip-flow in rectangular microchannels with variable physical properties
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Heat transfer characteristics of developing gaseous slip-flow in rectangular microchannels with variable physical properties

机译：具有可变物理特性的矩形微通道中正在发展的气态滑流的传热特性

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摘要

The effects of variable physical properties on the flow and heat transfer characteristics of simultaneously developing slip-flow in rectangular microchannels with constant wall temperature are numerically investigated. A colocated finite-volume method is used in order to solve the mass, momentum and energy equations in their most general form. Various channel aspect ratios are studied at different Knudsen numbers. Simulations indicate that the constant physical property assumption can result in under/over-prediction of the local friction and heat transfer coefficients depending on the problem configuration. Density and thermo-physical property variations have significant effects on predicting flow and heat transfer characteristics in the developing and fully-developed regions. The degree of discrepancy varies for different cases depending on Knudsen number, aspect ratio and the temperature difference between the channel inlet and the wall. The results suggest that even low temperature differences can alter the friction and heat transfer coefficients considerably.
机译：数值研究了可变物理特性对在壁温恒定的矩形微通道中同时发展的滑流的流动和传热特性的影响。为了解决质量，动量和能量方程的最一般形式，使用了共置有限体积方法。在不同的Knudsen数下研究了各种通道的宽高比。仿真表明，恒定的物理属性假设可能会导致根据问题配置对局部摩擦系数和传热系数的预测不足/过高。密度和热物理性质的变化对预测发展中和充分发达地区的流动和传热特性有重要影响。差异程度在不同情况下会有所不同，具体取决于Knudsen数，纵横比和通道入口与壁之间的温差。结果表明，即使温度差很小，也会显着改变摩擦系数和传热系数。

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