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題名 | Combined Heat and Mass Transfer by Laminar Natural Convection in a Vertical Square Duct=垂直方形管內之層流自然對流混合熱質傳分析 |
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作者 | 李冠宗; | 書刊名 | 亞東工業專科學校學報 |
卷期 | 19 1999.06[民88.06] |
頁次 | 頁(4)1-(4)9 |
分類號 | 335.24 |
關鍵詞 | 垂直方形管內; 層流自然對流; 混合熱質傳; |
語文 | 英文(English) |
中文摘要 | 本研究係探討垂直方形管內之層流自然對流混合熱質傳現象,考慮一壁面具等壁 溫/等濃度(UWTUWC)或等熱通量/等質量通量(UHF/UMF)邊界條件。以速度-渦度法解動量、能 量與濃度方程式,分析流量、平均Nusselt number(Nu)與Sherwood number(Sh)對管長、浮 力效應比、Grashof number與Schmidt number之關係,並獲得其通用關係方程式。同時亦 導出於UWT/UWC完全擴展流時之理論解。 |
英文摘要 | The present work investigates numerically the laminar natural convection heat and mass transfer in open vertical square ducts with uniform wall temperature/uniform wall concentration (UWT/UWC) or uniform heat flux/uniform mass flux (UHF/UMF) boundary conditions. The vorticity-velocity formulation is applied to solve for the coupled momentum, energy and concentration equations. Results of dimensionless induced volume rate Q, average Nusselt number Nu and Sherwood number Sh are presented in terms of channel length L, buoyancy ratio N, Grashof number Gr and Schmidt number Sc. Analytical solutions for Q, Nu and Sh for the UWT/UWC case are derived under fully developed condition. In addition, the correlation equations of Q, Nu and Sh for both boundary conditions are also presented. |
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