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題 名 | Mixed Convection Heat and Mass Transfer in Vertical Rectangular Ducts=垂直矩形管混合對流熱質傳分析 |
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作 者 | 呂有豐; 李冠宗; | 書刊名 | 亞東工業專科學校學報 |
卷 期 | 17 1997.06[民86.06] |
頁 次 | 頁(2)1-(2)25 |
分類號 | 335.24 |
關鍵詞 | 垂直矩形管; 混合對流熱質傳; |
語 文 | 英文(English) |
中文摘要 | 本研究係探討垂直矩形管多孔壁薄膜蒸發對混合對流熱質傳影響,文中考慮濕壁 面溫度自 40 ℃至 60 ℃, 入口空氣相對濕度為 10,50 或 90 %, 及雷諾數為 1000 或 2000。研究結果顯示熱浮力與溶解擴散浮力對流體流動,熱與質傳均有顯著影響。由於濕壁 面之薄膜蒸發的質傳增強壁面之熱傳效應,此外,壁面之熱傳係由薄膜蒸發之潛熱傳遞所主 導。 |
英文摘要 | The present study deals with the numerical prediction of mixed convection and mass transfer in a vertical rectangular duct with film evaporation along the porous wall. Boussinesq approximation is invoked to take into account buoyancy effect induced by thermal and mass diffusion. Computations are made here for wetted wall temperature Tw=40 ℃ and 60 ℃, relative humidity of moist air at inlet ∮ =10,50 and 90%, and through-flow Reynolds number Re=1000 and 2000. The numerical results, including the developments of velocity, temperature, Nusselt number, Sherwood number, and friction factor, are presented. predicted results show that the influences of combined buoyancy force of thermal and solutal diffusion on the flow, heat and mass transfer are significant. Due to the film evaporation along the wetted wall, the mass transfer is found to enhance the heat transfer rate along the wetted wall. Additionally, the results disclose that the heat transfer along the wetted wall is predominated by the latent heat transfer connected with film vaporization. |
本系統中英文摘要資訊取自各篇刊載內容。