A spin on cavity formation during water entry of hydrophobic and hydrophilic spheres
Author(s)Truscott, Tadd T.; Techet, Alexandra H.
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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.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering
Physics of Fluids
American Institute of Physics
Truscott, Tadd T., and Alexandra H. Techet. “A spin on cavity formation during water entry of hydrophobic and hydrophilic spheres.” Physics of Fluids 21 (2009): 121703.© 2009 American Institute of Physics.
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