研究生: |
連心慧 Lian, Xin-Hui |
---|---|
論文名稱: |
針對不同接觸角在核沸騰上之熱區研究 Hot spot on nucleate boiling with various contact angles. |
指導教授: |
李雄略
Lee, Shong-Leih |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 動力機械工程學系 Department of Power Mechanical Engineering |
論文出版年: | 2010 |
畢業學年度: | 98 |
語文別: | 中文 |
論文頁數: | 62 |
中文關鍵詞: | 二相流 、氣泡 、接觸角 、蒸發速率 |
相關次數: | 點閱:3 下載:0 |
分享至: |
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本研究利用數值方法模擬氣泡在加熱板上之沸騰現象,主要考慮氣泡在不同接觸角度下之氣液二相間的熱傳問題,藉以觀察氣泡和水間的溫度場變化及流線變化趨勢。氣泡在接觸角小於九十度時,自由液面與水平板之間會產生一層水膜,此區的溫度梯度大,因此蒸發速率快,當水被蒸發成水蒸氣則順勢進入氣泡中,促使氣泡成長,體積增加,而但當接觸角大於九十度時,氣泡底部會直接與加熱板接觸,此時容易發生過熱(superheat)現象,使加熱板燒壞(burnout),本文主要模擬氣泡在接觸角三十度及六十五度下之熱傳效率好壞。
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