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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/65515

    Title: Conjugated heat transfer in double-pass laminar counterflow concentric-tube heat exchangers with sinusoidal wall fluxes
    Authors: Ho, Chii-Dong;Tu, Jr-Wei;Yang, Chih-Ming
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: Sinusoidal heat fluxes;Conjugated Graetz problems;Double-pass operation;Concentric circular heat exchanger
    Date: 2009-01-15
    Issue Date: 2011-10-21 16:32:33 (UTC+8)
    Publisher: Kidlington: Pergamon
    Abstract: An analytical method is proposed to predict the temperature distribution and local Nusselt number for laminar flow in a double-pass countercurrent heat exchanger with sinusoidal heat flux distribution. A design of inserting in parallel an impermeable barrier to divide an open conduit into two subchannels for conducting double-pass operations, resulting in substantially improved the heat transfer rate, has been evaluated theoretically in the fully developed region. Comparison with the theoretical results shows that the heat-transfer efficiency improvement for double-pass concentric circular heat exchangers is generally higher than those in the single-pass operations without an impermeable barrier inserted. The influences of the impermeable-barrier location on the heat-transfer efficiency improvement and power consumption increment, as indicated from theoretical predictions, can be used to determine the economical feasibility in operating double-pass devices.
    Relation: International Journal of Heat and Mass Transfer 52(1-2), pp.45-55
    DOI: 10.1016/j.ijheatmasstransfer.2008.05.036
    Appears in Collections:[化學工程與材料工程學系暨研究所] 期刊論文

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