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頁籤選單縮合
題名 | Filmwise Condensation on a Porous Horizontal Elliptical Tube with Uniform Suction Velocity=具均勻壁吸流速之多孔隙水平橢圓管上膜狀凝結 |
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作者 | 楊勝安; 許昭和; | 書刊名 | 高雄科學技術學院學報 |
卷期 | 28 1998.12[民87.12] |
頁次 | 頁139-153 |
分類號 | 472.22 |
關鍵詞 | 水平橢圓管; 多孔隙壁; 吸流; 層流膜狀凝結; Horizontal elliptical tube; Porous wall; Suction; Laminar film condensation; |
語文 | 英文(English) |
中文摘要 | 本文建立一解析模式以研究具均勻壁吸流之水平櫃圓管上靜止汽體之層流膜狀凝 結。 本文獲得各種不同參數:剖面積之離心率 e,壁吸流參數 Sw 和表面張力效應的 Bond 參做之倒數,1/Bo,等所決定橢圓管周圍之局部凝結液膜厚度與熱傳係數。另外,無因次之 平均熱傳係數 Nu(Ja ╱ Ra)1/4 隨 e 與 Sw 增加而增加。 但是, 表面張力效應對 Nu(Ja/Ra) 1/4 的影響幾乎微不足道, 尤其在低值離心率 e 下 (例如: e<0.825; 1/Bo=0.05)。至於無壁吸流特例本文結果簡化成一解析解,即 Nusselt 型解。 |
英文摘要 | A model is developed for the study of laminar, filmwise condensation from quiescent vapors onto a horizontal elliptical tube with uniform suction at its porous wall. The local film thickness and heat transfer coefficient around the elliptical periphery have been obtained for various values of the eccentricity e of the cross section, suction parameter Sw, and the inverse Bond number 1/Bo of the surface tension effect. The dimensionless mean heat transfer coefficient Nu(Ja/Ra)1/4 increases with increaasing e and Sw. But, the effect of surface tension on Nu(Ja/Ra)1/4 is insignificant, especially for small e (e.g. e< 0.825 for 1/Bo=0.05). For the case of no wall suction, the present solution reduces to an analytical result, i.e., a Nusselt-type solution. |
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