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    Numerical investigation of fluid flow and heat transfer under high heat flux using rectangular micro-channels

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    Type
    Article
    Authors
    Mansoor, Mohammad M. cc
    Wong, Kokcheong
    Siddique, Mansoor M.
    KAUST Department
    Physical Sciences and Engineering (PSE) Division
    Mechanical Engineering Program
    Date
    2012-02
    Permanent link to this record
    http://hdl.handle.net/10754/562080
    
    Metadata
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    Abstract
    A 3D-conjugate numerical investigation was conducted to predict heat transfer characteristics in a rectangular cross-sectional micro-channel employing simultaneously developing single-phase flows. The numerical code was validated by comparison with previous experimental and numerical results for the same micro-channel dimensions and classical correlations based on conventional sized channels. High heat fluxes up to 130W/cm 2 were applied to investigate micro-channel thermal characteristics. The entire computational domain was discretized using a 120×160×100 grid for the micro-channel with an aspect ratio of (α=4.56) and examined for Reynolds numbers in the laminar range (Re 500-2000) using FLUENT. De-ionized water served as the cooling fluid while the micro-channel substrate used was made of copper. Validation results were found to be in good agreement with previous experimental and numerical data [1] with an average deviation of less than 4.2%. As the applied heat flux increased, an increase in heat transfer coefficient values was observed. Also, the Reynolds number required for transition from single-phase fluid to two-phase was found to increase. A correlation is proposed for the results of average Nusselt numbers for the heat transfer characteristics in micro-channels with simultaneously developing, single-phase flows. © 2011 Elsevier Ltd.
    Publisher
    Elsevier BV
    Journal
    International Communications in Heat and Mass Transfer
    ISSN
    07351933
    DOI
    10.1016/j.icheatmasstransfer.2011.12.002
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.icheatmasstransfer.2011.12.002
    Scopus Count
    Collections
    Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program

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