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    Natural convection in square enclosure induced by inner circular cylinder with time-periodic pulsating temperature

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    Type
    Article
    Authors
    Huang, Zhu
    Zhang, Wei cc
    Xi, Guang
    KAUST Department
    Mechanical Engineering Program
    Physical Sciences and Engineering (PSE) Division
    Date
    2015-03
    Permanent link to this record
    http://hdl.handle.net/10754/566139
    
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    Abstract
    The periodic unsteady natural convection flow and heat transfer in a square enclosure containing a concentric circular cylinder is numerically studied. The temperature of the inner circular cylinder fluctuates periodically with time at higher averaged value while the temperature of the enclosure keeps lower constant, and the natural convection is driven by the temperature difference. The two-dimensional natural convection is simulated with high accuracy temporal spectral method and local radial basis functions method. The Rayleigh number is studied in the range 103 ≤ Ra ≤ 106, the temperature pulsating period ranges from 0.01 to 100 and the temperature pulsating amplitudes are a = 0.5, 1.0 and 1.5. Numerical results reveal that the fluid flow and heat transfer is strongly dependent on the pulsating temperature of inner cylinder. Comparing with the steady state natural convection, the heat transfer is enhanced generally for the time-periodic unsteady natural convection, and the local maximum heat transfer rate is observed for Ra = 105 and 106. Moreover, the phenomenon of backward heat transfer is discussed quantitatively. Also, the influence of pulsating temperature on the unsteady fluid flow and heat transfer are discussed and analyzed.
    Publisher
    Elsevier BV
    Journal
    International Journal of Heat and Mass Transfer
    ISSN
    00179310
    DOI
    10.1016/j.ijheatmasstransfer.2014.11.044
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ijheatmasstransfer.2014.11.044
    Scopus Count
    Collections
    Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program

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