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    Leidenfrost vapour layer moderation of the drag crisis and trajectories of superhydrophobic and hydrophilic spheres falling in water

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    Type
    Article
    Authors
    Vakarelski, Ivan Uriev cc
    Chan, Derek Y. C. cc
    Thoroddsen, Sigurdur T cc
    KAUST Department
    Clean Combustion Research Center
    High-Speed Fluids Imaging Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2014
    Permanent link to this record
    http://hdl.handle.net/10754/563225
    
    Metadata
    Show full item record
    Abstract
    We investigate the dynamic effects of a Leidenfrost vapour layer sustained on the surface of heated steel spheres during free fall in water. We find that a stable vapour layer sustained on the textured superhydrophobic surface of spheres falling through 95 °C water can reduce the hydrodynamic drag by up to 75% and stabilize the sphere trajectory for the Reynolds number between 104 and 106, spanning the drag crisis in the absence of the vapour layer. For hydrophilic spheres under the same conditions, the transition to drag reduction and trajectory stability occurs abruptly at a temperature different from the static Leidenfrost point. The observed drag reduction effects are attributed to the disruption of the viscous boundary layer by the vapour layer whose thickness depends on the water temperature. Both the drag reduction and the trajectory stabilization effects are expected to have significant implications for development of sustainable vapour layer based technologies. © the Partner Organisations 2014.
    Citation
    Vakarelski, I. U., Chan, D. Y. C., & Thoroddsen, S. T. (2014). Leidenfrost vapour layer moderation of the drag crisis and trajectories of superhydrophobic and hydrophilic spheres falling in water. Soft Matter, 10(31), 5662–5668. doi:10.1039/c4sm00368c
    Sponsors
    We acknowledge G. D. Li from the KAUST Solar and Photovoltaics Research Center for assisting in the water tank and heater device design, and the KAUST Machine Workshop for the support in setting the experiments. This work is support in part by an Australian Research Council Discovery Project Grant to DYCC.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    Soft Matter
    DOI
    10.1039/c4sm00368c
    PubMed ID
    24849267
    ae974a485f413a2113503eed53cd6c53
    10.1039/c4sm00368c
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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