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  • Heat transfer enhancement by recirculating flow within liquid plugs in microchannels

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    85205_1.pdf (774.1Kb)
    Author(s)
    Che, Zhizhao
    Wong, Teck Neng
    Nam-Trung, Nguyen
    Griffith University Author(s)
    Nguyen, Nam-Trung
    Year published
    2012
    Metadata
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    Abstract
    Plug flow can significantly enhance heat transfer in microchannels as compared to single phase flow. Using an analytical model of flow field, heat transfer in plug flow is investigated. The constant-surface-temperature boundary condition is considered. Three stages of the heat transfer in plugs are identified: (i) development of thermal boundary layer; (ii) advection of heated/fresh fluid in the plug; and (iii) thermally fully developed flow. Due to the transport of heated fluid and fresh fluid within the plug by the recirculating flow, oscillations of the Nusselt number at high Peclet numbers are observed and explained. The ...
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    Plug flow can significantly enhance heat transfer in microchannels as compared to single phase flow. Using an analytical model of flow field, heat transfer in plug flow is investigated. The constant-surface-temperature boundary condition is considered. Three stages of the heat transfer in plugs are identified: (i) development of thermal boundary layer; (ii) advection of heated/fresh fluid in the plug; and (iii) thermally fully developed flow. Due to the transport of heated fluid and fresh fluid within the plug by the recirculating flow, oscillations of the Nusselt number at high Peclet numbers are observed and explained. The effects of the Peclet number and the plug length on the heat transfer process are evaluated. The results show that short plugs are preferable to long plugs since short plugs result in high Nusselt numbers and high heat transfer indices.
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    Journal Title
    International Journal of Heat and Mass Transfer
    Volume
    55
    Issue
    7-8
    DOI
    https://doi.org/10.1016/j.ijheatmasstransfer.2011.11.050
    Copyright Statement
    © 2012 Elsevier Inc. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Mathematical sciences
    Physical sciences
    Engineering
    Microelectromechanical systems (MEMS)
    Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics)
    Experimental methods in fluid flow, heat and mass transfer
    Publication URI
    http://hdl.handle.net/10072/53048
    Collection
    • Journal articles

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