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題 名 | Evaporation of Water Film in an Enclosure Filled with a Porous Medium=水膜蒸發在充滿多孔性介質的空間中之熱質傳現象 |
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作 者 | 傅武雄; 柯文旺; | 書刊名 | 中國工程學刊 |
卷 期 | 22:3 1999.05[民88.05] |
頁 次 | 頁325-339 |
分類號 | 440.137 |
關鍵詞 | 蒸發; 多孔性介質; 潛熱; 顯熱; Evaporation; Porous medium; Latent heat; Sensible heat; |
語 文 | 英文(English) |
中文摘要 | 本研究以數值方法探討在一個多孔性介質中由自然對流所引發之熱、質傳現象。 為增強熱傳效率,在加熱壁面加上水膜,並且考慮潛熱和顯熱熱傳。數值方法應用SIMPLEC 法來解Darcy-Brinkman-Forchheimer model的統御方程式,等熱通量、孔隙率與銅粒粒徑 為計算參數。結果顯示水膜蒸發降溫的效應明顯、在高Darcy-Rayleigh數、潛熱熱傳扮演 降溫的重要角色。在Darcy-Rayleigh數小於4,平均Nusselt數約為2.5;在Darcy-Rayleigh 數介於4和4469之間,平均Nusselt數和Darcy-Rayleigh數在對數坐標中呈線性關係。 |
英文摘要 | A double diffusive natural Convection in an enclosure filled with a porous medium is investigated numerically. To enhance the heat transfer rate of a heat wall, the heat wall is wetted with a thin water film, then sensible and latent heat transfer occur simultaneously. The Darcy-Brinkman-Forchheimer model is used and the factors of heat flux, porosity and diameter of bead are taken into consideration. The SIMPLEC method with iterative processes is adopted to solve the governing equations. The results show that the effect of evaporation on the heat transfer rate is apparent, and the latent heat transfer plays an important role in the high Darcy-Rayleigh number situations. The averaged Nusselt number Nu is approximately 2.5 when Ra<4. In the range of 4<Ra~<4469, the relationship of the averaged Nusselt number with the Darcy-Rayleigh number is linear in logarithmic scale. |
本系統中英文摘要資訊取自各篇刊載內容。