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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >THERMAL MEASUREMENTS IN RECTANGULAR MICROCHANNELS
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THERMAL MEASUREMENTS IN RECTANGULAR MICROCHANNELS

机译：矩形微通道中的热测量

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摘要

This paper reports on an experimental study of heat transfer in high aspect ratio (width/depth), rectangular micro-channels. A single channel with width of 10 mm was cut into polycarbonate spacers of various thicknesses, resulting in channel depths of 128 μm, 263 μm and 521 μm. Heat transfer experiments were performed with a constant heat flux boundary condition applied at the surface of the channel. Experiments conducted for refrigerant R-124 working fluid in the range Re = 300 ― 900 and Pr = 3.6 ― 3.8 showed small or no departure from macro-scale predictions for channels with hydraulic diameters larger than 500 μm. Results for the 80∶1 aspect ratio channel showed a significant departure from theoretical predictions. Experimental values of local Nusselt numbers were approximately 25 percent lower than predicted using macro-scale theory.
机译：本文报道了高纵横比（宽度/深度）矩形微通道传热的实验研究。将宽度为10 mm的单个通道切成各种厚度的聚碳酸酯垫片，从而得到128μm，263μm和521μm的通道深度。传热实验是在通道表面施加恒定的热通量边界条件下进行的。对Re = 300 ― 900和Pr = 3.6〜3.8范围内的制冷剂R-124工作流体进行的实验表明，对于水力直径大于500μm的通道，宏观预测值几乎没有偏差。 80：1长宽比通道的结果显示出与理论预测的显着偏离。局部Nusselt值的实验值比使用宏观理论预测的值低约25％。

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