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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/110012

    Title: Analytical and experimental studies for power-law fluids in a double-pass parallel-plate heat exchanger under asymmetric isotherm conditions
    Authors: Ho, Chii-Dong;Lin, Gwo-Geng;Lin, Cheng-Yi;Jen, Li-Yang
    Keywords: Power-law fluids;conjugated Graetz problems;asymmetric wall condition;double-pass operation;performance improvement
    Date: 2017-03-01
    Issue Date: 2017-03-17 02:10:52 (UTC+8)
    Publisher: Elsevier
    Abstract: The double-pass parallel-plate heat exchanger under asymmetric isotherm conditions referred to conjugated Graetz problem was proposed to enhance the thermal performance and investigated theoretically and experimentally. The analytical solutions were obtained using the separation of variables, superposition principle and an orthogonal expansion technique in terms of power series. The dependence of the average Nusselt number on the Graetz number and power-law index was formulated in a simplified expression. The theoretical predictions show that the power-law fluids in such a double-pass operation come up with the considerable heat-transfer efficiency improvement as compared with those in an open conduit (without an impermeable resistless sheet inserted), especially when the double-pass device was operated in larger Graetz numbers. This work shows that the good agreement was obtained between the experimental results and theoretical predictions. The effects of the ratio of asymmetric wall temperatures, impermeable-sheet position and power-law index on the device performance enhancement and power consumption increment have also been presented.
    Relation: International Journal of Heat and Mass Transfer 106, pp.1242-1250
    DOI: 10.1016/j.ijheatmasstransfer.2016.10.104
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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