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題 名 | Natural Convective Heat Transfer in Rectangular Enclosures with a Cold Source=具冷源之矩形封閉空間自然對流熱傳遞 |
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作 者 | 蔡瑞益; 陳冠宇; 梁龍驥; | 書刊名 | 中原學報 |
卷 期 | 29:1 2001.03[民90.03] |
頁 次 | 頁63-68 |
分類號 | 335.2 |
關鍵詞 | 自然對流; 紐雪爾常數; 修正的雷萊數; Natural convection; Nusselt number; Modified Rayleigh number; |
語 文 | 英文(English) |
中文摘要 | 本文研究具冷源之二維矩形封閉空間內自然對流熱傳遞現象,其流場和溫度場之動量與能量方程式以PHOENICS CFD套裝軟體之K-ε紊流模型結合壁函數 計算;另冷源倒之邊界值條件以較低溫度設定,另外三面高溫側則設定總熱傳遞系數為常數,所得的結果包括不同長寬比之速度分佈與溫度分佈,及組雪爾數 與修正雷萊數之關係式。其關係式為Nu= 0.141Rao.212 (AR)O.362(h W/kf)o.到其中lx109<=<=lxlOll ,1.0到位 2.0 '與1W/m2KshslOW/m2K。 |
英文摘要 | A study of natural convective heat transfer in a two-dimensional rectangular enc10sure with a cold source is reported. PHOENICS CFD software package is used to solve the conser vation of momentum equation and energy equation by using K-εturbulence model associated with wa11 functions. The cold source side is taken as the low temperature, whereas the overa11 heat transfer coefficient to be constant is taken as the high temperature boundary condition at the other three sides. The results inc1ude the distributions of flow velocity and temperature in the enc10sure under different aspect ratios, and a correlation of the relationship of mean Nusselt number and modified Rayleigh number. When lx109<=Ra<=1x1011, 1.0<=AR~2.0and 1 W/ m2K<=H<10W/m2K, the relation is Nu = 0.141Rao2(AR)0.362(hW/kl.)343. |
本系統中英文摘要資訊取自各篇刊載內容。