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題 名 | 兩垂直平板間充滿非達西多孔性介質之混合對流分析 |
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作 者 | 王家麟; 張錦裕; | 書刊名 | 力學 |
卷 期 | 10:2 1994.06[民83.06] |
頁 次 | 頁131-143 |
分類號 | 440.137 |
關鍵詞 | 多孔性介質; 非達西效應; 混合對流; Porous medium; Non-darcy effeccs; Mixed convection; |
語 文 | 中文(Chinese) |
中文摘要 | 本文考慮非達西效應(non-Darcy effect),包括對流項,邊界,慣性以及可變 孔隙率和熱逸散( thermal dispersion )效應,對兩垂直平板間充滿多孔性介質之穩態混 合對流之影響。 流場包括進口區( entrance region )到完全發展區( fully developed region )。 討論之參數為葛雷斯荷夫數( Grashof number ),流體之熱傳導係數與多孔 性介質之固體部份的熱傳導係數比值( thermal conductivity ratio )及無因次顆粒直徑 ( dimensionless particle diameter )。 數值方法則採用三次樣線定置法( cubic spline collocation methed )。結果顯示,葛雷斯荷夫數及無因次顆粒直徑之增加造成局 部熱傳係數遞增。流體之熱傳導係數與多孔性介質之固體熱傳導係數的比值增加使熱傳係數 遞增。完全發展流時,無因次顆粒直徑越大變孔隙率所產生之渠道效應越不明顯。 |
英文摘要 | Non-Darcy effects including the influence of convection, boundary, inertia, variable porosity and thermal dispersion on mixed convection from the entrance to fully developed region in a vertical channel filled with porous media are examined. The governing parameters are the Grashof number, thermal conductivity ratio of fluid to the solid of the porous matrix and dimensionless particle diameter. The coupled nonlinear partial differential equation are solved by the cubic splin collocation methed. Results indicate that the local heat transfer rate increases as the Grashof number and dimensionless particle diameter increase. An increase of the conductivity ratio of fluid to the solid of the porous matrix results in an increase of the local heat transfer rate. As the dimensionless particle diameter increases, for a fully developed flow, the wall channelling effect resulted from the variable porosity decreases. |
本系統中英文摘要資訊取自各篇刊載內容。