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    題名: Analytical and experimental studies for power-law fluids in double-pass parallel-plate heat exchanger under asymmetric isotherm conditions
    作者: Ho, Chii-Dong;Lin, Gwo-Geng;Lin, Cheng-Yi;Jen, Li-Yang
    關鍵詞: Power-law fluids;conjugated Graetz problems;asymmetric wall condition;double-pass operation;performance improvement
    日期: 2017-03-01
    上傳時間: 2017-03-17 02:10:52 (UTC+8)
    出版者: Elsevier
    摘要: 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.
    關聯: International Journal of Heat and Mass Transfer 106, pp.1242-1250
    DOI: 10.1016/j.ijheatmasstransfer.2016.10.104
    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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