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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/104533

    Title: Recycle Effect on Heat Transfer Enhancement in Double-Pass Heat Exchangers under Asymmetric Isotherm Conditions
    Authors: Chii-Dong Ho;Yi-Chin Chen;Li-Pang Lin
    Keywords: Asymmetric isotherm conditions;Conjugated Graetz problems;Heat transfer;Performance improvement;External recycle
    Date: 2015-10
    Issue Date: 2016-01-06 11:01:24 (UTC+8)
    Publisher: Pergamon Press
    Abstract: The mathematical formulation of a heat transfer flow problem in the recycling parallel-plate heat exchanger under asymmetric wall temperatures was developed theoretically with ignoring axial conduction, and the analytical solution was obtained using a superposition principle and an orthogonal expansion technique in extended power series. The influences of the design parameters of the impermeable-sheet position (∆), and the operating parameters of the Graetz number (Gz), wall temperature ratio (σ) and recycle ratio (R) are examined. Significant heat transfer improvement is obtainable by employing double-pass devices instead of using single-pass ones for a larger Graetz number system. A technical feasibility of the new double-pass device was investigated in terms of the Nusselt number and device performance improvement under the effect of wall temperature ratios.
    Relation: International Communications in Heat and Mass Transfer 67, pp.109–113
    DOI: 10.1016/j.icheatmasstransfer.2015.07.011
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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