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    Characterization of counter-rotating streamwise vortices in flat rectangular channel with one-sided wavy wall

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    Type
    Article
    Authors
    Bouremel, Yann
    Mitsudharmadi, Hatsari cc
    Budiman, Alexander C.
    Winoto, Sonny H.
    KAUST Department
    Clean Combustion Research Center
    Date
    2016-11-01
    Online Publication Date
    2016-11-01
    Print Publication Date
    2017-04
    Permanent link to this record
    http://hdl.handle.net/10754/622181
    
    Metadata
    Show full item record
    Abstract
    Particle Image Velocimetry (PIV) has been used to characterize the evolution of counter-rotating streamwise vortices in a rectangular channel with one sided wavy surface. The vortices were created by a uniform set of saw-tooth carved over the leading edge of a flat plate at the entrance of a flat rectangular channel with one-sided wavy wall. PIV measurements were taken over the spanwise and streamwise planes at different locations and at Reynolds number of 2500. Two other Reynolds numbers of 2885 and 3333 have also been considered for quantification purpose. Pairs of counter-rotating streamwise vortices have been shown experimentally to be centred along the spanwise direction at the saw-tooth valley where the vorticity ωz=0ωz=0. It has also been found that the vorticity ωzωz of the pairs of counter-rotating vortices decreases along the streamwise direction, and increases with the Reynolds number. Moreover, different quantifications of such counter-rotating vortices have been discussed such as their size, boundary layer, velocity profile and vorticity. The current study shows that the mixing due to the wall shear stress of counter-rotating streamwise vortices as well as their averaged viscous dissipation rate of kinetic energy decrease over flat and adverse pressure gradient surfaces while increasing over favourable pressure gradient surfaces. Finally, it was also demonstrated that the main direction of stretching is orientated at around 45° with the main flow direction.
    Citation
    Bouremel Y, Mitsudharmadi H, Budiman AC, Winoto SH (2017) Characterization of counter-rotating streamwise vortices in flat rectangular channel with one-sided wavy wall. Experimental Thermal and Fluid Science 82: 75–82. Available: http://dx.doi.org/10.1016/j.expthermflusci.2016.10.034.
    Sponsors
    The authors express their appreciation to Mr. Lucius Sim and Mr. M.N. Adha b Jamaludin for their help in setting up the experimental rig and in collecting the experimental data.
    Publisher
    Elsevier BV
    Journal
    Experimental Thermal and Fluid Science
    DOI
    10.1016/j.expthermflusci.2016.10.034
    Additional Links
    http://dx.doi.org/10.1016/j.expthermflusci.2016.10.034
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.expthermflusci.2016.10.034
    Scopus Count
    Collections
    Articles; Clean Combustion Research Center

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