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    題名: Theoretical and experimental studies of flux enhancementwith roughened surface in direct contact membrane distillation desalination
    作者: Ho, Chii-Dong;Chang, Hsuan;Chang, Cheng-Liang;Huang, Cheng-Hao
    關鍵詞: Direct contact membrane distillation;Desalination;Heat transfer;Surface roughness;Temperature polarization
    日期: 2013-04-15
    上傳時間: 2016-01-06 11:01:15 (UTC+8)
    摘要: 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.
    關聯: Journal of Membrane Science 433, pp.160-166
    DOI: 10.1016/j.memsci.2012.12.044
    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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