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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/108161

    Title: Theoretical and experimental studies of flux enhancement with roughened surface in direct contact membrane distillation desalination
    Authors: Ho, Chii-Dong;Chang, Hsuan;Chang, Cheng-Liang;Huang, Cheng-Hao
    Keywords: Direct contact membrane distillation;Desalination;Heat transfer;Surface roughness;Temperature polarization
    Date: 2013-04-15
    Issue Date: 2016-11-02 02:10:38 (UTC+8)
    Publisher: Amsterdam: Elsevier BV
    Abstract: A new design of direct contact membrane distillation (DCMD) using roughened-surface flow channel for enhancement of heat transfer was proposed for increasing the pure water productivity in saline water desalination. The roughened surface was fabricated using siphonic-blasting with aluminum oxide (Al2O3) sand grains and arc spraying for Ni film coating. Experimental study has demonstrated its feasibility and up to 37% of performance enhancement was obtained for the experimental system. A mathematical model considering heat and mass transfer mechanisms has been developed and incorporated with experimental data for evolving a correlation for a heat transfer coefficient correction factor. The correlation is expressed as relative roughness and can be used for predicting the heat transfer coefficient for roughened-surface channels. Considering the tradeoff between the flux enhancements at the expense of energy consumption, an optimized level of roughness can be determined.
    Relation: Journal of Membrane Science 433, pp.160-166
    DOI: 10.1016/j.memsci.2012.12.044
    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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