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題名 | Uniform Transpiration Effect on Coupled Heat and Mass Transfer in Mixed Convection About a Vertical Cylinder in Porous Media: the Entire Regime=飽和多孔性介質內均勻噴吸流效應對混合對流流經垂直圓柱體熱與質量傳遞之影響:整個範圍 |
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作者 | 易國安; | 書刊名 | 中國機械工程學刊 |
卷期 | 20:1 1999.02[民88.02] |
頁次 | 頁81-86 |
分類號 | 447.553 |
關鍵詞 | 飽和多孔性介質; 噴吸流效應; 混合對流; 垂直圓柱體熱; 質量傳遞; 邊界層分析; Transpiration effect; Heat and mass transfer; Porous media; |
語文 | 英文(English) |
中文摘要 | 本文使用邊界層分析以探討在飽和多孔性介質內,噴吸流效應對混合對流流經垂 直圓柱體熱與質量傳遞之影響。圓柱表面均維持等溫度與濃度。先使用變數轉換再以凱勒盒 子法解此非相似方程式。 局部 Nusselt 數與 Sherwood 數均因吸入(噴出)流效應而增加 (減少)。增加浮力比 N 與曲率參數ξ則增強局部 Nusselt 數與 Sherwood 數。此外,增 加路易士數則減少(增大)局部熱(質)傳遞率。 |
英文摘要 | A boundary layer analysis is used to investigate the effect of uniform transpiration velocity on the heat and mass transfer characteristics of mixed convection about a vertical cylinder in saturated porous media under the coupled effects of thermal and mass diffusion. The surface is maintained at uniform wall temperature and concentration. The non-similar governing equations are obtained by using a suitable transformation and solved by Keller-box method. The local Nusselt number and the local Shewood number increase (decrease) due to the effect of suction (blowing). Increasing the buoyancy ratio N and curvature parameter ξ enhances the local Nusselt number and the local Sherwood number. Furthermore, increasing the Lewis number decreases (increases) the local heat (mass) transfer rate. |
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