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題名 | 壁面熱傳導效應對微極流體沿垂直中空圓柱自然對流的影響=Effect of Wall Conduction on Natural Convection Flow of Micropolar Fluids Over a Vertical Slender Hollow Circular Cylinder |
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作者姓名(中文) | 張振龍; | 書刊名 | 修平學報 |
卷期 | 1 2000.09[民89.09] |
頁次 | 頁45-62 |
分類號 | 335.21 |
關鍵詞 | 微極流體; 共軛熱傳; 固液介面溫度; 局部熱傳率; Micropolar fluids; Conjugate heat transfer; Interfacial temperature; Local heat transfer rate; |
語文 | 中文(Chinese) |
中文摘要 | 本文針對垂直細長中空圓柱管壁熱傳導效應對微極流體之流動及熱傳特性的影響 , 做一番深入之探討。 數值計算, 採用三次樣線定置法( Cubic Spline Collocation Method )來求解,為求結果之準確性,計算所得之數值與相對應狀況的文獻相比較, 並獲 得十分吻合之結果。 結果顯示:微極流體參數⊿及共軛熱傳參數 P 的增加, 會導致壁面摩擦參數、局部熱傳率 及介面溫度分佈等的降低。當普朗特數 Pr 增大時,固液介面溫度變化及局部熱傳率會增加 ,但壁面摩擦參數會降低。 總而言之,微極流體相較於牛頓流體,在壁面摩擦係數及壁面熱傳率上,會有較低的值,而 在固液介面溫度上卻具有較高的值。 |
英文摘要 | The effects of heat conduction of slender hollow cylinder on convective heat transfer of micropolar fluids have been analyzed in detial. In this thesis, the resulting nonlinear differential equations of the problems are solved numerically by using the cubic spline collocation method. These results are also compared numerically with the corresponding previous paper, and found in a good agreement. Results show that an increase of in the micropolar material parameter ⊿, or the conjugate heat transfer parameter �d leads to lower skin friction factor, local heat transfer rate and interfacial temperature. The larger values of the Prandtl number yield the higher the interfacial temperature variation and the local heat transfer rate at wall, and the lower values of the skin friction coefficient. Moreover, in comparison to a Newtonian fluid, the micropolar fluid is found to have smaller the skin friction factor and the local heat transfer rate, and a higher interfacial temperature. |
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