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題 名 | Numerical Investigation on Laminar and Turbulent Flow Characteristics in Bifurcating Lung Airways=肺部分岔氣管內層流與紊流流場特性之數值研究 |
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作 者 | 葛自祥; 葉憲璋; | 書刊名 | 龍華科技大學學報 |
卷 期 | 18 民94.06 |
頁 次 | 頁27-35 |
分類號 | 361.191 |
關鍵詞 | 呼吸氣流; 三層次分岔流; 二次流; 數值方法; Inspiratory flow; Three-generation lung airway; Secondary vortices; Numerical methods; |
語 文 | 英文(English) |
中文摘要 | 本文係利用數值模擬方式探討肺部分岔氣管內層流與紊流流場特性之差異。針對氣管入口雷諾數為500, 1000(屬層流範圍)及3000(屬紊流範圍)等三個事例,進行計算分析。研究結果發現,當氣管入口雷諾數不同時,對氣管內之分岔氣流速度之均勻度、二次流結構與強度,以及分岔流之質量流率分佈等流場特性,皆有十分顯著之影響。對這些流場特性差異性之了解,對進一步之研究與相關之應用,具有重要之參考價值。 |
英文摘要 | The inspiratory flow fields in a three-generation lung airway are investigated by numerical methods in the present paper. Three simulated cases of Reynolds number 500, 1500 (laminar flow) and 3000 (turbulent flow) are computed. The different flow characteristics of laminar and turbulent flows are compared and emphasized in the paper. The results show that the important flow features in the airways, including uniformity of velocity distributions, the strength of secondary vortices, and the mass flow rate in the bifurcations, are considerably influenced by the inlet Reynolds number. The understanding of the flow characteristics provided in the present paper is worthwhile for the further study and the relevant applications in the lung airways. |
本系統中英文摘要資訊取自各篇刊載內容。