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研究生:鄭滄彬
研究生(外文):Tsang-bin Jeng
論文名稱:觀測固液介面與氣泡周圍濃度變化
論文名稱(外文):To observe on a solid-liquid advancing interface and concentration to change around bobbles
指導教授:魏蓬生
學位類別:碩士
校院名稱:國立中山大學
系所名稱:機械與機電工程學系研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:37
中文關鍵詞:固化氣泡濃度
外文關鍵詞:solidificationbobbleconcentration
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本次研究目的是在探討溶有氣體的水在結冰固化過程中,在介面上成長的氣泡成核現象,而這也是模擬固化中的工件上會產生的孔隙。液體的過飽和會導致氣泡產生,這樣的現象在很多領域都會發生,例如熱傳,製造,生化等。在本研究中,除了測量氣泡成核的尺寸,另外也測量固化介面處的氣體濃度。將實驗結果與理論預測相互對照之後,可以瞭解水中的氣體對氣孔尺寸的影響。
Heterogeneous nucleation of bubbles on an advancing solidification front during freezing of water containing a dissolved gas has been experimentally and analytically studied. The formation of bubbles resulting from supersaturation of liquids is commonly encountered in different fields such as heat transfer, manufacturing, and bioscience.In this work, sizes of nucleating bubbles and concentration profiles of dissolved oxygen and carbon dioxide gases in water ahead of the solidification front have been measured.From successful comparisons between the measured and predicted critical radii of nucleating bubbles and distributions of dissolved gas content, phenomena of heterogeneous nuc leation in a binary weak solution during the freezing process are quantitatively confirmed.
謝誌………………………………………………………………… i
目錄………………………………………………………………… ii
摘要………………………………………………………………… iv
英文摘要…………………………………………………………… v
圖目錄……………………………………………………………… vi
表目錄……………………………………………………………… viii
符號說明…………………………………………………………… ix
第一章 緒論
1-1 前言……………………………………………………………… 1
1-2 文獻回顧………………………………………………………… 1
1-3 研究目的………………………………………………………… 5
第二章 理論背景
2-1 固化過程濃度變化之解析……………………………………… 6
2-2 液體內的濃度……………………………………………………10
2-3 均相的結晶成長…………………………………………………13
2-4 異相的結晶成長…………………………………………………16
第三章 實驗設備與步驟
3-1 實驗設備…………………………………………………………21
3-2 實驗步驟…………………………………………………………24
第四章 實驗結果與討論
4-1 實驗結果與討論…………………………………………………25
第五章 結論
5-1 結論………………………………………………………………34
參考文獻………………………………………………………………35
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