Quasi-streamwise counter-rotating vortices generated by convergent riblets in flat plate boundary layer

T. Nadesan*, H. Mitsudharmadi, T. S. Lee, S. H. Winoto

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    7 Scopus citations

    Abstract

    Abstract: Flow structures initiated by multiple convergent riblets, arranged in tandem, in the developing laminar boundary layer on a flat plate were qualitatively studied for a flow velocity of 1.5 m/s by means of smoke wire flow visualization. Two different configurations with varying pitch, 3 and 1.5 mm, and a constant height 3 mm, had been considered. Results depict the development of mushroom-like counter-rotating vortices accompanied by symmetrically distributed small-scale co-rotating vortices and subsequent breakdown of the structures. Though the variation of pitch indicates similar flow structures, the point of breakdown of the structures was found to vary significantly. The probable reasons for the breakdown of the structures have also been discussed.

    Original languageEnglish (US)
    Pages (from-to)319-325
    Number of pages7
    JournalJournal of Visualization
    Volume17
    Issue number4
    DOIs
    StatePublished - Oct 18 2014

    Bibliographical note

    Publisher Copyright:
    © 2014, The Visualization Society of Japan.

    Keywords

    • Convergent riblets
    • Flat plate boundary layer
    • Passive devices
    • Streamwise counter-rotating vortices

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electrical and Electronic Engineering

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