臺灣博碩士論文加值系統

紅外線穩態熱阻量測法是一套具有高適應性及非接觸式的熱阻量測法，而在量測法中使用到的石墨粉雖能方便量測，但其卻也導致熱源覆蓋的部份溫度會有量不準的問題，因此本論文先藉由有限元素分析法探討石墨層帶來的影響，並根據熱阻的定義，在模擬中取出熱流傳遞方向物體之截面積變化，再以線性擬合的方式歸納出一個函數形式，用以推算物體表面最熱點溫度，最後進行實驗並與模擬結果做相互驗證。

Measurement of thermal resistance with infrared at steady state is a high adaptive and non-contact measuring method for thermal resistance. However, the graphite layer is convenient for measuring method, but it also brings out a problem that causes the temperature error on the heat source area. Therefore, in this research, finite element analysis (FEA) method is used to discuss temperature error from graphite layer. Accor-
ding to definition of thermal resistance, finding the effective cross-
sectional area along heat transfer propagation direction and using linear fitting to find a functional form which is used to calculate the highest temperature on the surface of sample. At last, performing experiment confirm simulation result.

摘要 I
Abstract. II
致謝 III
圖目錄 VI
表目錄 X
第一章 緒論 1
1-1前言 1
1-2研究動機 4
第二章 基礎理論 6
2-1引言 6
2-2發光二極體發熱原理 6
2-3熱傳遞基本理論 7
2-3-1熱傳導 8
2-3-2熱對流 11
2-3-3熱輻射 12
2-4熱阻 13
第三章 模擬分析 17
3-1有限元素分析流程 17
3-2模擬模型建立與探討石墨層造成的影響 18
3-3模擬結果及數學式推導 22
3-3-1有效熱傳導面積在不同熱源半徑下比較 25
3-3-2以數學式表示有效熱傳導面積隨位置的變化 27
3-4案例分析 31
3-4-1熱絕緣與自然對流比較 31
3-4-2雙點熱源 33
第四章 實驗結果與分析 36
4-1實驗架構及流程 36
4-2實驗結果與誤差分析 39
第五章 結論與未來展望 55
5-1結論 55
5-2未來展望 56
參考文獻 57

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