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題 名 | Mixed-Convection Film Condensation on a Horizontal Elliptical Tube with Variable Wall Temperature=水平橢圓管具變化溫度效應下之混合對流膜狀凝結熱傳 |
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作 者 | 楊勝安; 許昭和; | 書刊名 | 中國機械工程學刊 |
卷 期 | 20:4 1999.08[民88.08] |
頁 次 | 頁373-384 |
分類號 | 446.11 |
關鍵詞 | 水平橢圓管; 溫度效應; 混合對流; 膜狀凝結; 熱傳; Film condensation; Elliptical tube; Mixed convection; Nonisothermal wall; |
語 文 | 英文(English) |
中文摘要 | 本文係理論解析自然與強制混合對流條件下,由於液--汽界面汽體黏剪力,壓力 梯度, 與管面變化溫度等效應同時作用下,各種離心率 (e) 之水平橢圓管上膜狀凝結液的 流動與熱傳特性,對於等溫管面上之自然對流膜狀凝結,其平均熱傳係數可經由本文結果簡 化獲得與早期文獻相同的數值, 即 e=0 水平圓管以及 e=1.0, 垂直平板分別為: Nu(Ja/Ra)=0.728; Nu(Ja/Ra)=0.943 至於強制對流膜狀凝結,由於位勢流與表面張力同時 產生之壓力梯度效應,其平均熱傳係數隨橢圓管之離心率值增加而變大。同時, 橢圓管壁上 溫度變化效應對平均熱傳係數之影響亦為本文討論重點。 |
英文摘要 | An analytical study of the simultaneous effects of interfacial vapor shear, pressure gradient and non-isothermal wall temperature variation on condensate film flow and heat transfer characteristics from horizontal elliptical tubes with various eccentricities, e, for conditions of free and forced convection has been performed. For free convection film condensation on an isothermal wall, the present result for dimensionless mean heat transfer coefficient reduces to the same form, Nu(Ja/Ra), whose value is 0.728 for e=0 (circular tube) and 0.943 for e=1.0 (vertical plate), as derived in the earlier work. For forced convection film condensation, the dimensionless mean heat transfer coefficient, NuRe, increases with eccentricity under the effects of pressure gradient due to potential flow and surface tension. The dependence of condensation heat transfer coefficient on the effect of non-isothermal wall temperature variation is also discussed. |
本系統中英文摘要資訊取自各篇刊載內容。