熱泳與熱輻射對拉伸壁面熱質傳遞之研究

Effects of Thermophoresis and Radiation on Heat and Mass Transfer for Flow over a Streching Surface

游登義(TENG-YI YU)

指導教授 ： 蔡瑞益

中原大學/工學院/機械工程研究所/碩士(2010年)

https://doi.org/10.6840/cycu201000545

摘要

本文探討當受到熱泳及熱輻射效應影響時，對暫態拉伸表面的熱質傳遞現象。本文為不可壓縮、穩態和二維層流之平板對稱流的模型，其統御方程式包括動量、能量及濃度場方程式。將統御方程式經過無因次化相似轉換過程後，數值計算方面以Runge-Kutta積分法配合射擊法求解。結果包含了不同暫態參數 、熱輻射參數 、及熱泳參數 之流場、溫度場及濃度場分布。

結果可以發現，速度會隨著暫態參數的增加而降低。熱傳率則隨著暫態參數和熱輻射參數的增加而增大。當壁面溫度大於外在溫度時，濃度將隨著溫度梯度增大而向外界擴散。

關鍵字

拉伸壁 ； 熱輻射 ； 熱泳

並列摘要

A study of the effect of thermophoresis and radiation field on heat and mass transfer from an unsteady stretching surface is reported. In this study, the air flow was modeled as two dimensional, incompressible and steady-state laminar flow. The similarity transformation and numerical technique are used to solve governing equations include mass, momentum, energy and concerntration. The solutions are obtained by Runge-Kutta integration method and shooting method. The results include velocity profiles, temperature and concentration distributions for different , and .
Results showed that the velocity profiles were found to be reduced by increasing values of the unsteadiness parameter . The heat transfer rate is increased with increasing and . The effects of thermophoresis were predicted to be particularity important for concentration blowing away a hot surface at a given temperature gradient.

並列關鍵字

Thermophoresis ； Radiation ； Streching Surface

參考文獻

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