This paper investigates the experimental program on the study of heat transfer characteristics in micro-channels. The two test sections used are of 47 and 50 micro-channels in rectangular cross-section of equivalent diameters 387 and 327 μm respectively. Each channel of length 192 mm is fabricated on a 304 stainless steel substrate (230 mm x 160 mm x 1.6 mm) by photo chemical etching process. Covering the top with another plate of 0.5 mm thickness forms the channels by vacuum brazing. Experiments cover laminar region using the fluids ethanol, methanol and an ethanol-methanol mixture. The heat transfer coefficient is evaluated based on the heat carried away by the coolant and an average wall to mean fluid temperature difference. The Nusselt number is correlated through empirical correlations involving Reynolds number and Prandtl number with length parameter, the hydraulic diameter.
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机译：本文研究了研究微通道传热特性的实验程序。所使用的两个测试部分在矩形截面中分别具有47个微通道和50个微通道，等效直径为387和327μm。长度为192 mm的每个通道都是通过光化学蚀刻工艺在304不锈钢基板（230 mm x 160 mm x 1.6 mm）上制造的。用另一块0.5mm厚的板覆盖顶部，通过真空钎焊形成通道。实验使用液体乙醇，甲醇和乙醇-甲醇混合物覆盖了层流区域。传热系数是根据冷却剂带走的热量和平均壁温来估算的，以表示平均流体温度差。通过涉及雷诺数和普朗特数与长度参数（水力直径）的经验相关性来关联努塞尔特数。
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