Jump to main content
Jump to site search

Issue 31, 2014
Previous Article Next Article

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

Author affiliations

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.

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

Back to tab navigation

Supplementary files

Publication details

The article was received on 16 Feb 2014, accepted on 09 Apr 2014 and first published on 09 Apr 2014


Article type: Paper
DOI: 10.1039/C4SM00368C
Author version
available:
Download author version (PDF)
Citation: Soft Matter, 2014,10, 5662-5668
  •   Request permissions

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

    I. U. Vakarelski, D. Y. C. Chan and S. T. Thoroddsen, Soft Matter, 2014, 10, 5662
    DOI: 10.1039/C4SM00368C

Search articles by author

Spotlight

Advertisements