三角形微流道對流熱傳之模擬分析

Numerical simulations of forced convection in triangular microchannels

許育榮(Yu-Rong Shyu)

指導教授 ： 鄧治東

中原大學/工學院/機械工程研究所/碩士(2005年)

https://doi.org/10.6840/cycu200500624

摘要

本研究係以數值分析軟體CFDRC程式進行單相流體於低雷諾數下流經三角形微流道之流場與溫度場行為探討，並比較模擬值、實驗值、古典理論值及參考文獻值之差異性。其中三角形微流道水力直徑範圍介於52 μm至207 μm之間，雷諾數分佈範圍自2至60，工作流體採去離子水，分析結果顯示fRe模擬值與古典理論值相比較，其差異在10﹪之內，且前者之值皆低於後者；而fRe模擬值與實驗值相比較，其差異在6﹪之內。此外紐賽數之模擬值則低於Wu與Cheng之文獻經驗值，誤差在30﹪之內；流體溫度於微流道內係隨入口至出口距離呈非線性之趨勢而增，流體之流率大小則影響入口溫度及整體溫度場分佈。

關鍵字

單相流體 ； 紐賽數 ； CFDRC分析軟體 ； 三角形微流道 ； 壓降

並列摘要

This study investigated the behaviors of flow and temperature fields for single-phase low Reynolds number fluid flowing through triangular microchannels, using numerical analysis tool – CFDRC. In addition, comparisons were made among the results obtained from numerical simulations, experimental data, conventional correlations, and those in the literature.

The hydraulic diameters used in this study were in the range between 57 μm and 207 μm; the Reynolds numbers, 2 to 60. Deionized water was used as the working fluid. The results obtained indicated that the numerically obtained values of fRe were below and within 10% of the fRe values obtained from the conventional correlation for the macro fluidic system, while the fRe values obtained from numerical analyses were within 6% of the experimental data obtained for the triangular microchannels.

In addition, the Nusselt numbers obtained from numerical analysis were within 30% of those values obtained from the correlation by Wu and Cheng. Furthermore, it was observed that the temperature of the fluid inside the microchannels increases non-linearly as the distance from the entrance along the axial direction of the flow increases; the fluid flow rates have an impact on the entrance temperature and the overall temperature distribution.

並列關鍵字

Single-phase fluid ； Triangular microchannels ； CFDRC analytic software ； Pressure drops ； Nusselt numbers

參考文獻

[25] Personal communication with J.C. Chu, Thermo-Analysis Group, Department of mechanical Engineering, Chung Yuan Christian University, June 2005.

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for VLSI,” IEEE Electron Device Lett., EDL-2, pp. 126-129.(1981)

[4] P. Wu and W. A. Little, “Measurement of friction factors for the flow of gases in very fine channel heat exchangers used for microminiature Joule-Thomson refrigerators,” Cryogenics, No. 5, Vol. 23, pp. 273-277. (1983)