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    題名: Improvement in Performance of Multi-Pass Laminar Counterflow Heat Exchangers with External Refluxes
    作者: Ho, Chii-dong;Yeh, Ho-ming;Tsai, Yu-chuan
    貢獻者: 淡江大學化學工程與材料工程學系
    日期: 2002-08
    上傳時間: 2009-11-04 15:53:48 (UTC+8)
    出版者: Kidlington: Pergamon Press
    摘要: A study on improvement in performance of multi-pass rectangular heat exchangers with uniform wall temperature and with external refluxes has been carried out under counterflow operations. An orthogonal expansion technique for solving such a conjugated Graetz problem is developed and applied to investigate a substantially improving heat transfer. A description of the average Nusselt number and the outlet dimensionless temperature is given. It is shown that for asymptotic average Nusselt numbers exit in counterflow as in single-flow operations. Numerical values of asymptotic average Nusselt numbers are reported for a wide range of Graetz numbers. Comparisons of analytical results are made with single-flow operations of the same size (without sheets inserted and without recycle). Considerable improvement in the heat transfer rate for large Graetz numbers is obtainable by introducing the recycle-effect concept in designing such double-pass operations. The effect of sheet location on the enhancement of heat transfer efficiency as well as on the increment of power consumption has been also discussed.
    關聯: International Journal of Heat and Mass Transfer 45(17), pp.3529-3547
    DOI: 10.1016/S0017-9310(02)00070-4
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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