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題 名 | Bubble Stability and Homogeneous Nucleation(2)--Bubble Nuclartion=均質成核與氣泡穩定性(2)--氣泡之成核 |
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作 者 | 張士傑; | 書刊名 | 明志工專學報 |
卷 期 | 27 1995.05[民84.05] |
頁 次 | 頁47-62 |
分類號 | 341.3453 |
關鍵詞 | 氣泡核; 穩定性; Nucleus; Stability; |
語 文 | 英文(English) |
中文摘要 | 本文藉各種不同指數係數之熱力過程,研究三類氣泡在液體中之穩定性。研究結果顯示:(1)所有純蒸汽之氣泡皆僅能處於不穩定之平衡。(2)所有純理想氣體氣泡之平衡皆屬於穩定平衡。(3)在同一溫度下,每個混合氣之氣泡皆有大小兩個平衡球積並形成門檻區。其中小球積氣之平衡為穩定平衡,而大球積氣泡之平衡為不穩定平衡。(4)在相同氣泡球積下,蒸汽氣泡核與混合氣氣泡核之最高容忍超飽和溫度,後者比前者減少1/3倍。本文研究結果可應用於孔蝕,氣泡成核,與沸騰現象之定性分析。 |
英文摘要 | The stability of a bubble in a liquid with/without undissolved gas was studied in this paper. Using given indexes of heating processes, the stability of the bubbles and the states for bubble nucleation were analyzed. The results show that: (1) All pure vapor bubbles at equilibrium points are unstable. (2) All pure ideal-gas bubbles at equilibrium points are stable. (3) Each vapor-gas mixture bubble may have two equilibrium points forming a threshold region (depending on the bubble temperature), with a stable equilibrium point at the small root and an unstable equilibrium point at the large root. (4) The maximum tolerant supersaturation is reduced by one-third when the nuclei of vapor bubbles are replaced by the nuclei of vapor-gas mixture bubbles with the same size as the former. The results are important to cavitation, bubble nucleation, and boiling processes. |
本系統中英文摘要資訊取自各篇刊載內容。