Endwall convective heat transfer for bluff bodies

Lei Wang, Mirko Salewski, Bengt Sundén, Andreas Borg, Hans Abrahamsson

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    Abstract

    The endwall heat transfer characteristics of forced flow past bluff bodies have been investigated using liquid crystal thermography (LCT). The bluff body is placed in a rectangular channel with both its ends attached to the endwalls. The Reynolds number varies from 50,000 to 100,000. In this study, a single bluff body and two bluff bodies arranged in tandem are considered. Due to the formation of horseshoe vortices, the heat transfer is enhanced appreciably for both cases. However, for the case of two bluff bodies in tandem, it is found that the presence of the second bluff body decreases the heat transfer as compared to the case of a single bluff body. In addition, the results show that the heat transfer exhibits Reynolds number similarity. For a single bluff body, the Nusselt number profiles collapse well when the data are scaled by Re0.55; for two bluff bodies arranged in tandem, the heat transfer scaling is changed to Re0.51, indicating that the power index of Reynolds number is flow dependent.
    Original languageEnglish
    JournalInternational Communications in Heat and Mass Transfer
    Volume393
    Issue number2
    Pages (from-to)167-173
    ISSN0735-1933
    DOIs
    Publication statusPublished - 2012

    Keywords

    • Heat transfer scaling
    • Bluff bodies
    • Endwall heat transfer
    • LCT

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