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    Combined Effect of Mixed Convection and Surface Radiation Heat Transfer for Thermally Developing Flow in Vertical Channels

    Access Status
    Fulltext not available
    Authors
    Ganesan, Rajamohan
    Narayanaswamy, Ramesh
    Perumal, Kumar
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Ganesan, R. and Narayanaswamy, R. and Perumal, K. 2017. Combined Effect of Mixed Convection and Surface Radiation Heat Transfer for Thermally Developing Flow in Vertical Channels. Heat Transfer Engineering. 39 (1): pp. 27-39.
    Source Title
    Heat Transfer Engineering
    DOI
    10.1080/01457632.2017.1280281
    ISSN
    0145-7632
    School
    Curtin Sarawak
    URI
    http://hdl.handle.net/20.500.11937/53156
    Collection
    • Curtin Research Publications
    Abstract

    Combined effect of laminar flow mixed convection and surface radiation heat transfer for thermally developing airflow in a vertical channel heated from a side has been experimentally examined with different thermal and geometric parameters. The channel boundary is made of two isothermal walls and two adiabatic walls, the isothermal parallel wall is heated uniformly and the opposite cold wall temperature is maintained equal to the inlet conditions. The heated wall temperature ranged from 55 to 100°C, Reynolds number ranged from 800 to 2900 and the heat flux was varied from 250 to 870 W/m2. To cover the wide range of Reynolds numbers, two aspect ratios of square and rectangular section were used. Surface radiation from the internal walls is considered through two emissivities i.e. 0.05 and 0.85, to represent weak and strong radiation effects, respectively. From the experiments, surface temperature and Nusselt number distributions of convection and radiation heat transfer are obtained for different heat flux values. Flow structure inside the channel is visualized to observe the flow pattern. The results show the combined effect of laminar flow mixed convection and surface radiation on the total heat transfer rate within the channel. The accumulating buoyancy force and airflow moves together vertically in the upward direction to give significant heat transfer enhancement in the vertical orientation of the channel.

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