Physics of elastic spheres skipping on water, 2013

Abstract: It is well known that one can skip a stone across the wa- ter surface, but less well known that a ball can also be skipped on water. The Waboba?R is an elastic ball used in a game of aquatic keep away in which players pass the ball by skipping it [...]

October 9th, 2015|2013, Publications|

Rebound and jet formation of a fluid-filled sphere, 2012

Abstract: This study investigates the impact dynamics of hollow elastic spheres partially filled with fluid. Unlike an empty sphere, the internal fluid mitigates some of the rebound through an impulse driven exchange of energy wherein the fluid forms a jet inside the sphere. Surprisingly, this occurs on the second rebound or when [...]

October 9th, 2015|2012, Publications|

Holy balls! Balls that walk on water, 2012

Abstract: Not available. Citation and Link: Truscott, T.T., Wright, M.M., Langley, K.R., & Belden. J., “Holy balls! Balls that walk on water.” Physics of Fluids, 24, 091103; DOI: 10.1063/1.4746071, September 2012.

October 9th, 2015|2012, Publications|

Unsteady forces on spheres during free-surface water entry, 2012

Abstract We present a study of the forces during free-surface water entry of spheres of varying masses, diameters, and surface treatments. Previous studies have shown that the formation of a subsurface air cavity by a falling sphere is conditional upon impact speed and surface treatment. This study focuses on the forces experienced [...]

October 9th, 2015|2012, Publications|

Three-dimensional bubble field resolution using synthetic aperture imaging: application to a plunging jet, 2012

Abstract: A methodology for resolving three-dimensional (3D) bubble fields using 3D synthetic aperture imaging (SA imaging) is developed and applied to the bubbly flows induced by a turbulent circular plunging jet. 3D SA imaging involves capturing entirely in-focus images in an array of cameras with multiple viewpoints, then reprojecting the images into [...]

October 9th, 2015|2012, Publications|

Water entry of spinning hydrophobic and hydrophilic spheres, 2011

Abstract: An experimental investigation of the trajectories, forces and cavity formation behind spinning hydrophobic and hydrophilic spheres is presented. Several cases are also presented for non-spinning spheres which are half hydrophobic and half hydrophilic. Data from high speed imaging are processed using advanced data techniques to gain accurate position, velocity and acceleration [...]

October 7th, 2015|2011, Publications|

Three-dimensional synthetic aperture particle imaging velocimetry, 2010

Abstract: We present a new method for resolving three-dimensional (3D) fluid velocity fields using a technique called synthetic aperture particle image velocimetry (SAPIV). By fusing methods from the imaging community pertaining to light field imaging with concepts that drive experimental fluid mechanics, SAPIV overcomes many of the inherent challenges of 3D particle image velocimetry [...]

October 7th, 2015|2010, Publications|

Oil droplet in alcohol, 2010

Abstract: Not available. Citation and Link: La Foy, R.R., Belden, J., Truscott, T.T., Shih, A.M. & Techet, A.H., Oil droplet in alcohol, Physics of Fluids, 22, 032102, DOI: 10.1063/1.3483217, September 2010.

October 7th, 2015|2010, Publications|

The water entry of decelerating spheres, 2010

Abstract: We present the results of a combined experimental and theoretical investigation of the vertical impact of low-density spheres on a watersurface. Particular attention is given to characterizing the sphere dynamics and the influence of its deceleration on the shape of the resulting air cavity. A theoretical model is developed which yields [...]

October 7th, 2015|2010, Publications|

A spin on cavity formation during water entry of hydrophobic and hydrophilic spheres, 2009

Abstract: 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 surfacestaticwetting angle, below which air cavities no longer form. We show that transverse spin alters the spheres surface velocity distribution to straddle [...]

October 7th, 2015|2009, Publications|