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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/117041

    Title: Permeate flux enhancement with roughened-surface flow channel in air gap membrane distillation systems
    Authors: Chii-Dong Ho;Luke Chen;Chun-Hsuan Cheng;Tze-Hao Hsu;Jun-Wei Lim
    Keywords: Air-gap membrane distillation;Desalination;Relative roughness;Permeate flux;Temperature polarization
    Date: 2018-09-28
    Issue Date: 2019-09-17 12:12:58 (UTC+8)
    Publisher: Desalination Publications
    Abstract: A new design of the air-gap membrane distillation (AGMD) system for saline water desalination fabricating roughened-surface flow channel for heat transfer enhancement to produce high-purity water
    was investigated theoretically and experimentally. The theoretical predictions demonstrate that the
    AGMD system with roughened surface on the flow channel accomplishes a better device performance
    in pure water productivity compared with smooth-surface flow channel. The roughened-surface
    channel was fabricated using siphoned blasting with aluminum oxide (Al2
    ) sand grains and arc
    spraying for Ni-film coating. The effect of the relative roughness was correlated with experimental
    data to estimate the heat transfer coefficients. A theoretical model considering both heat and mass
    transfer mechanisms has been developed and solved numerically. The theoretical model predicts
    the permeate flux increased with the inlet volumetric flow rates, inlet saline temperatures and the
    channel roughness. The qualitative and quantitative agreements were found between the numerical
    predictions and the experimental results, and the model was validated with the error analysis and
    the precision index of an individual measurement with the inlet temperature of hot fluid, volumetric
    flow rate and relative roughness as parameters. An 11% permeate flux enhancement was found when
    using roughened-surface flow channel of the AGMD system according to the experimental data. The
    effect of fabricating roughened-surface flow channel on the permeate flux and energy efficiency was
    also evaluated. Correlations of Nusselt number for the smooth channel and channels with fabricating
    roughened-surface flow were obtained using the experimental results and theoretical predictions.
    These correlations indicated that the flow channel using larger relative roughness gives the higher
    permeate flux and energy efficiency than that in the smooth-surface flow channel.
    Relation: Desalination and Water Treatment 136, p.39-48
    DOI: 10.5004/dwt.2018.23235
    Appears in Collections:[水資源及環境工程學系暨研究所] 期刊論文

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