臺灣博碩士論文加值系統

科技日新月異，處處充滿在我們的生活四周，人們使用電子產品的機會也日漸增多，而公司必須要生產更多電子產品，趕上人們汰換的速度，必須不斷地開發許多技術。
本實驗主要探討孔徑為1.6 mm的二流體噴嘴，經由改變不同的實驗參數，如噴霧高度(H= 40 mm、50 mm、60 mm)、空氣液體質量比(R= 0.145、0.194、0.242、0.259、0.323)及表面溫度(Tw= 25 oC、75 oC、125 oC)，觀察流場及溫度場的變化。
實驗中，加熱系統由銅塊及加熱棒組成，以去離子水做為工作流體，利用微質點影像測速儀 (μPIV) 觀察速度分佈及全像干涉粒徑分析儀 (IPI) 觀察液滴粒徑等流場現象；溫度場量測，使用熱電偶(K-Type)進行冷卻實驗，並透過計算、分析以獲得最佳的臨界熱通量 (Critical Heat flux)。
實驗結果顯示，最佳臨界熱通量及最小的粒徑皆發生在噴霧高度為50 mm、氣液比為0.242。

This experiment mainly discusses the twin-fluid nozzle with the diameter of 1.6 mm by changing different experimental parameters, such as the spray height (H=40 mm, 50 mm, 60 mm), the mass ratio of air to liquid (R = 0.145, 0.194, 0.242, 0.259 , 0.323) and the surface temperature (Tw = 25 oC, 75 oC, 125 oC) to observe the flow field and temperature field.
In the experiment, the heater system consisted of the copper block and heating rods, DI water is used as the working fluid. The velocity distribution is observed by μPIV and the dimension of the particle is observed by IPI; the temperature field measurements, using the thermocouple (K-Type) for the cooling experiment, calculate and analysis to obtain the optimal critical heat flux (CHF).
The experimental results show the optimal critical heat flux and the smallest particle size occurs when the spray height of 50 mm and the gas-liquid ratio of 0.242.

[致謝+i]
[中文摘要+ii]
[ABSTRACT+iii]
[TABLE OF CONTENTS+iv]
[LIST OF TABLES+vi]
[LIST OF FIGURES+vii]
[NOMENCLATURE+ix]
[CHAPTER 1 INTRODUCTION+1]
[1.1 Motivation and background+1]
[1.2 Research purposes+2]
[1.3 Literature review+2]
[CHAPTER 2 EXPERIMENTAL SETUP+17]
[2.1 Optical measurement system+17]
[2.2 Fluid circulation system+19]
[2.3 Heater system+20]
[2.4 Data acquisition system+21]
[2.5 Other equipment+21]
[CHAPTER 3 EXPERIMENTAL PROCEDURE+33]
[3.1 Fluid circulation system+33]
[3.2 Optical measurement system+34]
[3.3 Temperature measurement system+36]
[CHAPTER 4 THEORETICAL ANALYSIS+41]
[4.1 Air to liquid ratio (R)+41]
[4.2 Slip ratio (S)+41]
[4.3 Void fraction (α)+41]
[4.4 Reynolds number (Re)+42]
[4.5 Weber number (We)+42]
[4.6 Heat flux (q")+43]
[4.7 Heat transfer coefficient (h)+43]
[CHAPTER 5 UNCERTAINTY ANALYSIS+45]
[CHAPTER 6 RESULTS AND DISCUSSION+48]
[6.1 μPIV measurements+48]
[6.2 IPI measurements+51]
[6.3 The cooling measurements+52]
[CHAPTER 7 CONCLUSIONS AND RECOMMENDATIONS+83]
[7.1 Conclusions+83]
[7.2 Recommendations+84]
[REFERENCES+85]
[APPENDIX A+90]

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