臺灣博碩士論文加值系統

本研究將模擬不固定鰭片體積與固定鰭片體積下不同參數調變後鰭片對於高功率白光LED燈具之散熱情形，文中探討了不固定鰭片體積下調變鰭片數目、鰭片長度、鰭片高度與鰭片厚度，而固定鰭片體積下有兩種做法，其中之一是改變不同長厚比(L/T)，如L/W=2.025、L/W =2.5、L/W=3.025與L/W=3.6等情形，另一種方式是變換不同的鰭片形狀，如Top triangle與Bottom triangle，又其Top triangle之散熱能力又優於Bottom triangle。

本研究中最後也指出調變完不固定鰭片體積之參數能降低高功率白光LED燈具10.05%的溫度，至於調變完固定鰭片體積之參數甚至能降低高功率白光LED燈具17.23%的溫度。

This thesis simulating the high power white light LED lamp under two conditions, which are volume-unfixed fins and volume-fixed fins. By changing the different parameters, we hope to improve its performance. There are different fin numbers, fin length, fin height and fin thickness under volume-unfixed fins method. There are different L/T ratio like L/T = 2.025, L/T = 2.5, L/T = 3.025, L/T = 3.6 and different fin shapes like top triangle and bottom triangle under volume-fixed fins method, and the ability of thermal dissipate of top triangle shape is better than bottom triangle shape.

Finally, this study has pointed out that there is 10.05% temperature decrease under volume-unfixed fins method, and there is 17.23% temperature decrease under volume-fixed fins method.

中文摘要--------------------------------------------------------------------------- i
Abstract --------------------------------------------------------------------------- ii
誌謝 --------------------------------------------------------------------------- iii
目錄 --------------------------------------------------------------------------- iv
表目錄 --------------------------------------------------------------------------- vi
圖目錄 --------------------------------------------------------------------------- vii
符號說明---------------------------------------------------------------------------- x
第一章 緒論--------------------------------------------------------------------- 1
1.1 前言--------------------------------------------------------------------- 1
1.2 研究動機--------------------------------------------------------------- 2
第二章 原理介紹--------------------------------------------------------------- 3
2.1 LED發光原理--------------------------------------------------------- 3
2.2 熱傳原理--------------------------------------------------------------- 5
2.2.1 熱傳導傳遞(conduction heat transfer)------------------------------ 5
2.2.2 熱對流傳遞(convection heat transfer)---------------------------- 6
2.2.3 熱輻射傳遞(radiation heat transfer)------------------------------ 7
2.3 流體運動的描述----------------------------------------------------- 8
2.3.1 層流與紊流------------------------------------------------------------ 8
2.4 接面溫度---------------------------------------------------------------- 9
2.5 色溫---------------------------------------------------------------------- 10
2.6 封裝材料---------------------------------------------------------------- 11
2.7 封裝材料的熱膨脹係數-------------------------------------------- 12
第三章 理論基礎---------------------------------------------------------------- 13
3.1 物理模型--------------------------------------------------------------- 13
3.2 數學模型--------------------------------------------------------------- 13
3.2.1 The Boussinesq Model----------------------------------------------- 13
3.2.2 理論假設-------------------------------------------------------------- 14
3.2.3 統御方程式----------------------------------------------------------- 14
3.2.4 層流流場--------------------------------------------------------------- 15
3.2.5 邊界條件-------------------------------------------------------------- 15
3.2.6 初始條件--------------------------------------------------------------- 16
3.3 數值方法------------------------------------------------------------- 16
3.4 網格種類-------------------------------------------------------------- 17
第四章 熱流之模型建立與分析------------------------------------------- 19
4.1 模擬軟體簡介------------------------------------------------------- 19
4.2 模型建立-------------------------------------------------------------- 20
4.3 網格測式-------------------------------------------------------------- 22
4.4 模擬流程-------------------------------------------------------------- 24
4.5 不同體積下改變鰭片數目、長度、高度、厚度對溫度的變化------27
4.5.1 不同鰭片數對溫度的變化------------------------------------------ 27
4.5.2 不同鰭片長度數對溫度的變化-------------------------------------- 30
4.5.3 不同鰭片高度對溫度的變化------------------------------------ 32
4.5.4 不同鰭片厚度對溫度的變化------------------------------------ 35
4.6 固定體積之鰭片在不同形狀下與溫度的關係-------------- 38
4.6.1 L/T =2.025、L/T =2.5、L/T =3.025、L/T =3.6 ----------------- 38
4.6.2 Top Triangle and Bottom Triangle---------------------------------- 41
4.7 綜合比較-------------------------------------------------------------- 43
第五章 結論與未來展望------------------------------------------------------ 44
5.1 結論---------------------------------------------------------------------- 44
5.2 未來展望---------------------------------------------------------------- 45
參考文獻 ---------------------------------------------------------------- 46

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