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研究生:范惠菱
研究生(外文):Hui-Ling Fan
論文名稱:氣懸粒子核化過程之數值模擬
指導教授:陳正平陳正平引用關係
指導教授(外文):J. P. Chen
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:大氣科學研究所
學門:自然科學學門
學類:大氣科學學類
論文種類:學術論文
論文出版年:1999
畢業學年度:87
語文別:中文
論文頁數:132
中文關鍵詞:核化
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僅靠單一種類分子的核化,需要在相當大的過飽和狀況下才能達到有效的核化速率,這在實際大氣中不太可能發生。若考慮雙(多)組分的情況下,則此核化過程在相對濕度、相對酸度均小於100%的狀況下就能發生。即在一般大氣條件下,新粒子的產生主要是經由雙(多)組分核化過程。而在計算新粒子生成的核化速率上所需要的核化參數在溫度變化上也已做良好的處理,模式結果顯示,在相對濕度和相對酸度愈大且溫度愈低時,核化速率愈大。
並將此雙組分核化理論應用在汽車污染排放上,考慮H2SO4-H2O的核化。同時並提出假說,認為經由汽車引擎的高溫燃燒會蒸發大氣中原有的氣懸粒子,釋放出核化所需要的酸氣,不需要經由空氣中的光化學作用而生成。模式中首先考慮廢氣傳導冷卻和混合冷卻這兩種狀況,並分別考慮核化消耗與否,結果均顯示新粒子的生成經由排放廢氣和周圍空氣的混合冷卻就能生成,此假設並有加熱管實驗和引擎溫度足以蒸發氣懸粒子之調查以資佐證。
此研究已對氣懸粒子的核化過程做一完整模擬,且已建立一個雙組份核化速率模式,可計算出任何溫度下,各相對濕度與相對酸度的核化速率。在空氣污染日漸嚴重和汽機車、飛機數量日漸增加的情況下,其應用的價值十分高,因此此初步的核化過程模擬可說十分重要。

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