梯形縱截面環狀複合材料散熱片列之暫態熱傳分析

Transient Thermal Response of a Composite Trapezoidal Annular Fin Assembly

陳俊明(Jiunn-Ming Chen) ； 賈明益(Ming-I Char)

《農業機械學刊》 1卷2期 (1992/04) Pp. 1-8

https://doi.org/10.30062/JAM.199204.0001

摘要

本文主要在探討梯形縱截面環狀散熱片和支撐壁一散熱片(fin assembly)之暫態熱傳問題。散熱片列外表被覆蓋一層與散熱片不同材質之表面層，其表面熱傳遞係數爲非均勻變化。本文採用有限差分法配合M.S.I.P計算法求得數值解，從而計算散熱片列及表面覆蓋層內之溫度分佈及內壁上熱通量與時間的變化情況。結果顯示針對散熱片列問題作二維溫度場分析是必要的，其與傳統分析散熱片作一維假說之結果不同。此外，當支撐壁厚度增厚，表面覆蓋層厚度減薄，散熱片前緣端之畢歐數增加或支撐壁內面畢歐數減低時，均會造成散熱片組之熱通量增大，加強散熱效果。

關鍵字

散熱片 ； 畢歐數 ； 熱通量

並列摘要

In the present work, the numerical study of the transient thermal response of a composite trapezoidal annular fin assembly is investigated. The fin assembly coated with a face material of different thermal characteristics involving nonuniform convective heat transfer to the enviornment is also examined. Numerical solutions are obtained by using the finite difference method. In order to solve the system of algebraic equations, the modified strongly implicit procedure has been utilized. Therefore, the temperature distribution and the heat flux through the supporting wall are calculated. It is shown that the isothermal lines of the fin assembly are two-dimensional variations. Moreover, the heat flow through the fin assembly increases as the tube thickness increases, the thickness of the face layer decreases, the Biot number B(subscript if) increases, or B(subscript i) decreases.

並列關鍵字

fin ； Biot number ； heat flux