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    Experimental study on mixed convection heat transfer in a square duct with varying inclination angles

    Access Status
    Fulltext not available
    Authors
    Rajamohan, G.
    Narayanaswamy, Ramesh
    Kumar, P.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Rajamohan, G. and Narayanaswamy, R. and Kumar, P. 2015. Experimental study on mixed convection heat transfer in a square duct with varying inclination angles. Pertanika Journal of Science and Technology. 23 (1): pp. 141-151.
    Source Title
    Pertanika Journal of Science and Technology
    ISSN
    0128-7680
    School
    Department of Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/34050
    Collection
    • Curtin Research Publications
    Abstract

    This study analysed mixed convection heat transfer for thermally developing flow in a side heated square duct with varying inclination angles. The test section consists of one-side heated isothermal wall and three adiabatic walls. The inclination angle varied from 0° to 20°, with hot wall temperature ranging from 30°C to 100°C, and heat flux ranging from 252 W/m 2 to 872 W/m 2 . Reynolds number was varied from 858 to 1788 and the wall surface emissivity was considered to be 0.05 and 0.85. Flow visualizations were carried out to obtain the flow structure of natural convection and mixed convection for three inclination angles. The variation of surface temperature along the length of the test section was studied to calculate the convective Nusselt number. The result showed that the heat transfer enhancement and convective Nusselt number was significantly affected by the variations of inclination angle, flow velocity, Reynolds number, and the surface radiation. It was also observed that the increase in the inclination angle improved convection rate and hence significantly enhanced heat transfer.

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