Surface coating and impact velocity can dramatically affect cavity formation during water entry of spheres. Duez et al [Nat. Phys. 3, 180 (2007)] present a theoretical limit, dependent on impact velocity and surface static wetting angle, below which air cavities no longer form. We show that transverse spin alters the spheres surface velocity distribution to straddle this theoretical limit, resulting in cavity formation over half of the sphere and none on the other half, and yields similar results to the case of a sphere dropped without spin, at the same impact speed, when its surface is half hydrophilic and half hydrophobic.
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Letter| December 31 2009
A spin on cavity formation during water entry of hydrophobic and hydrophilic spheres
Tadd T. Truscott;
Tadd T. Truscott, Alexandra H. Techet; A spin on cavity formation during water entry of hydrophobic and hydrophilic spheres. Physics of Fluids 1 December 2009; 21 (12): 121703. https://doi.org/10.1063/1.3272264
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