本實驗主要目的為針對高功率LED 的散熱需求，探討利用噴霧冷卻方式來進行散熱的性能分析。本實驗利用壓電陶瓷材質製成的超音波微孔霧化片來建立一噴霧冷卻系統，本系統使用霧化片陣列( 3 × 2 )來對24 顆( 6 × 4 )高功率LED 進行散熱實驗，選用3 種不同瓦數(1 W、3 W、5 W)的LED 來進行測試，總輸入功率分別為24、72 及120 W，工作流體為去離子水(DI water)，探討不同孔徑(dj = 7、35 μm)的霧化片在不同噴霧距離(z = 10、20、30、40、50 mm)下的性能差異，本實驗利用熱電偶量測LED 封裝底部散熱座溫度，再利用LED 熱阻推算出LED 晶片溫度，並透過微質點影像測速系統(μPIV)觀測腔體內的噴霧流場，藉此分析流場變化對於散熱性能的影響。

By focusing on the cooling requirement of high power LED, the study aims to explore the spray cooling method and analyze its cooling performance. The ultrasonic micro-nozzle plate made of piezoelectric ceramic material was used in this experiment in order to establish a spray cooling system. The nozzle plate array (3 × 2) was used to carry out a cooling test for 24 LEDs with high power (6 × 4). Three different watts (1 W, 3 W, 5 W) of LED were tested, the total input power was 24W, 72W and 120 W, respectively, and the working medium was DI water. The goal is to understand the variance in performance caused by nozzle plates of different nozzle diameters (dj = 7, 35 μm) in varied nozzle distances (z = 10, 20, 30, 40, 50 mm). The experiment used thermocouples to measure the slug temperature of LED. By applying thermal resistnace to the LED to calculate its chip temperature, and using micrometer resolution particle image velocimetry (μPIV) to observe the spray flowfield inside the LED chamber, this study analyzes the influence of flowfield change on cooling performance.

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...........................................................................2
1-3 噴霧冷卻發展之背景...............................................................3
1-4 文獻回顧...................................................................................4
1-5 研究目的...................................................................................8
第二章　實驗系統與設備......................................................................13
2-1　微質點影像測速儀系統.........................................................13
2-2　超音波微孔霧化片.................................................................14
2-3 溫度量測系統..........................................................................15
2-4 其他實驗週邊設備..................................................................15
第三章　實驗方法及步驟.................................................................... ..24
3-1 微型噴霧系統設計與製作......................................................24
3-2 μPIV量測系統建立及原理....................................................26
3-3 LED熱阻量測步驟.................................................................27
3-4 實驗量測參數..........................................................................28
第四章　理論分析...................................................................................36
4-1 熱傳分析與計算......................................................................36
4-2 結點溫度量測原理..................................................................38
4-3 冷卻系統熱阻計算..................................................................41
第五章　誤差分析...................................................................................46
第六章　結果與討論...............................................................................50
6-1 腔體內μPIV流場分析............................................................50
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...............................................................................85
7-1 結論..........................................................................................85
7-2 建議與改進..............................................................................86
參考文獻...................................................................................................87
附錄 A......................................................................................................94

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