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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/106115

    Title: Improvement in Performance of Multi-Pass Laminar Counterflow Heat Exchangers with External Refluxes
    Authors: Ho, Chii-Dong;Yeh, Ho-Ming;Tsai, Yu-Chuan
    Contributors: 淡江大學化學工程與材料工程學系
    Date: 2002/08/01
    Issue Date: 2016-04-22 13:20:34 (UTC+8)
    Publisher: Pergamon Press
    Abstract: 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.
    Relation: International Journal of Heat and Mass Transfer 45(17), pp.3529-3547
    DOI: 10.1016/S0017-9310(02)00070-4
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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