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ISSN Online: 2688-7231

ISBN Online: 978-1-56700-524-0

Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
December, 17-20, 2021, IIT Madras, Chennai, India

Drop Impact on inclined superhydrophobic surface

Get access (open in a dialog) DOI: 10.1615/IHMTC-2021.1100
pages 733-738

Abstract

A drop impacting on a inclined superhydrophobic surface yields different and more complex dynamics than on horizontal surfaces. For horizontal superhydrophobic surface, droplet goes through inertia driven lateral spreading, then retraction and at last takes off in the vertical direction. The drop goes through this process while keeping a symmetrically circular shape and the contact time of the drop on the surface is constant and independent of its impact velocity. On the other hand, for drop impact on inclined superhydrophobic surface, the retraction and bouncing dynamics is asymmetric and more complex. The contact time reduction due to the presence of asymmetry for inclined impact is analysed. Numerical simulations are performed by varying inclination angle of the surface (15°, 30°, 45° & 60°) for a normal Weber number (Wen) range of 10 to 80. Present simulations are able to capture the contact time minimization due to inclination of the surface. Distinct regimes of symmetric and asymmetric bouncing are also observed.