本實驗在探討以壓電陶瓷材質製成的超音波微孔霧化片(ultrasonic micro-nozzle plate)為核心建立起一套運用於高功率LED散熱上的噴霧冷卻系統；本系統利用單顆霧化片來對4顆(2 × 2) 高功率LED進行散熱，總輸入功率為4 W、12 W及20 W，工作流體為去離子水(DI water)，探討在不同的霧化片孔徑(dj = 7、35 μm)下，對於不同噴霧距離(z = 10、20、30、40、50 mm)的性能差異；透過微質點影像測速儀(μPIV)觀測腔體內的噴霧流場，並以熱電偶(thermocouple)量取LED散熱座的溫度，進而利用LED熱阻推算出LED結點溫度(junction temperature, Tj)，藉此分析噴霧於腔體內流場的變化對於LED散熱的影響，並探討噴霧冷卻方式來進行LED散熱的可行性。

This study aims to explore the use of an ultrasonic micro-nozzle plate, made of piezoelectric ceramic material, as a core material to establish a set of spray cooling system for high power LED. The system uses a single nozzle plate to implement a cooling test for 4 high power LEDs (2 × 2). The total input power was 4 W, 12 W and 20 W, and working medium was DI water. In order to understand the performance variance introduced by utilizing nozzle plates with differing nozzle diameters (dj = 7, 35 μm) across various nozzle exit to test distance (z = 10, 20, 30, 40, 50 mm). By using micrometer resolution particle image velocimetry (μPIV) to observe the spray flowfield inside the chamber, and using thermocouples to measure the temperature of LED slug and thermal resistance was used to calculate the LED junction temperature , Tj, for analyzing the influence of flowfield change spread in chamber on its cooling performance. The possibility of an LED spray cooling system is also explored.

目錄............................................................................................................i
表目錄......................................................................................................iv
圖目錄.......................................................................................................v
符號說明.................................................................................................viii
中文摘要....................................................................................................x
英文摘要...................................................................................................xi
第一章　序論............................................................................................1
1-1 前言...........................................................................................1
1-2 LED溫度特性..........................................................................1
1-3 噴霧冷卻發展之背景...............................................................2
1-4 文獻回顧...................................................................................4
1-5 研究目的...................................................................................8
第二章　實驗系統與設備......................................................................14
2-1　微質點影像測速儀系統..........................................................14
2-2　超音波微孔霧化片..................................................................15
2-3 溫度量測系統.........................................................................16
2-4 其他實驗週邊設備.................................................................16
第三章　實驗方法及步驟......................................................................25
3-1 噴霧冷卻系統設計與製作.....................................................25
3-2 μPIV量測系統建立及原理..................................................27
3-3 LED內部熱阻量測步驟........................................................28
3-4 實驗量測參數.........................................................................29
第四章　理論分析..................................................................................37
4-1 熱傳分析與計算.....................................................................37
4-2 結點溫度量測原理.................................................................39
4-3 冷卻系統熱阻計算.................................................................42
第五章　誤差分析..................................................................................47
第六章　結果與結論..............................................................................51
6-1 腔體內μPIV流場分析..........................................................51
6-2 LED之溫度量測分析............................................................53
6-3 冷卻系統熱阻分析.................................................................56
6-4 綜合分析討論.........................................................................58
第七章　結論與建議..............................................................................86
7-1 結論.........................................................................................86
7-2 建議與改進.............................................................................87
參考文獻..................................................................................................89
附錄 A.....................................................................................................96

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