液體性質與加熱器操作參數對微小加熱器熱汽泡成長行為影響之研究

Abstract

本研究的目的在於應用實驗方法分析汽泡受液體性質、表面親疏水性與操作參數的影響。研究中我們利用攝影機進行現象之可視化，分析藉由改變液體黏滯性、加熱器表面親疏水性，以及功率大小其熱汽泡成長隨時間變化的狀態，並界定使氣泡驅動的可行範圍與以上參數之間的關係；本研究中我們確定一些重要的物理參數，並針對這些物理參數其在不同設定值下，深入探討汽泡之熱力行為。 實驗分析結果顯示在增加液體黏度、不同表面親疏水性均會使汽泡驅動的可行範圍有明顯影響；在不同表面親疏水性中，均會有汽泡生長不穩定現象；在增加液體黏度時會使汽泡體積明顯縮小。在表面親水性時會使熱汽泡頂端高度有明顯的增加，而在表面疏水性時會使熱汽泡汽固界面接觸直徑有明顯的增加。不同表面親疏水性下，改變功率會使體積變化有明顯的影響。

The present study purposes to experimentally examine the influence of liquid properties, hydrophilic conditions, and power on thermal bubble behavior. The CCD camera connected to a video recorder is utilized to visualize thermal bubble formation and growth process, and defined the advisable range for the application of bubble actuation for various viscosity of liquids, hydrophilic conditions, and power. Some significant physical parameters are define, and the thermodynamic behavior of thermal bubble is discussed in detail at various viscosity of liquids, hydrophilic conditions, power and various of the physical parameters. Experimental results show obvious influences of viscosity, hydrophilic conditions on the advisable range for application of bubble actuation. The instability of bubble formation and growth process take place for various hydrophilic conditions. Experimental results show the obvious influences of viscosity, hydrophilic conditions, and power on contact diameter between bubble and surface, height of the thermal bubble, and volume of the thermal bubble.