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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/87920

    Title: 具迴流剪稀薄流體於二行程套管加熱器之研究
    Other Titles: An analytical study of the power-law fluids in double-pass concentric circular heat exchanger under external recycle
    Authors: 顧廣凱;Ku, Kaung-Kai
    Contributors: 淡江大學化學工程與材料工程學系碩士班
    Keywords: 格拉茲問題;冪次流體;同心圓管;正交性質;剪稀薄;Graetz problem;Power-law fluid;Concentric Tube;Orthogonal expansion techniques;Shear thinning
    Date: 2012
    Issue Date: 2013-04-13 11:52:17 (UTC+8)
    Abstract: 本研究是將非牛頓流體中具有剪稀薄現象之液體作為工作流體使用於二行程套管加熱器中,而加熱器設計為圓形管加裝一可忽略熱阻之隔板,使之成為一組固定外壁溫度具有迴流裝置之圓柱同心套管熱交換器,此系統所推導出的數學模型是屬於共軛格拉茲問題(conjugated Graetz problem),以分離變數法並利用正交展開方法(orthogonal expansion technique),探討不同的剪稀薄係數與迴流效應於二行程套管間的熱傳效率之影響,其結果與單行程系統比較效率上的改善,也與實驗結果做比較了解理論的準確性。
    Conjugated Graetz problems by considering the heat transfer behavior in power-law fluids flowing through a double-pass concentric circular tube with uniform wall temperature are studied theoretically and solved analytically using an orthogonal expansion technique. The mathematical formulation of such a heat transfer flow problem is developed by assuming fully developed laminar velocity distribution in both inner and annular channels with ignoring axial conduction. The theoretical predictions show that the outlet temperature and Nusselt number decrease with decreasing power-law index. Comparisons between the results obtained from the concentric circular heat exchange and those of a single pass (open conduit) were presented graphically. The effect of power-law index on the heat-transfer efficiency enhancement on the double-pass device has also been discussed.
    Appears in Collections:[化學工程與材料工程學系暨研究所] 學位論文

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