Water exit dynamics of buoyant spheres, 2016

Abstract: Buoyant spheres released below the free surface can rise well above the surface in a phenomenon known as pop-up. Contrary to intuition, increasing the release depth sometimes results in a lower pop-up height. We present the pop-up height of rising buoyant spheres over a range of release depths (1–12.5 diameters) and Reynolds numbers (4×104 [...]

November 2nd, 2016|2016, Publications|

Error propagation dynamics of PIV-based pressure field calculations: How well does the pressure Poisson solver perform inherently?, 2016

Abstract: Obtaining pressure field data from particle image velocimetry (PIV) is an attractive technique in fluid dynamics due to its noninvasive nature. The application of this technique generally involves integrating the pressure gradient or solving the pressure Poisson equation using a velocity field measured with PIV. However, very little research has been done [...]

July 22nd, 2016|2016, Publications|

The upside-down water collection system of Syntrichia caninervis, 2016

Abstract: Desert plants possess highly evolved water conservation and transport systems, from the root structures that maximize absorption of scarce ground water1,2,3,4,5, to the minimization of leaf surface area6 to enhance water retention. Recent attention has focused on leaf structures that are adapted to collect water and promote nucleation from humid air7,8,9. Syntrichia [...]

July 22nd, 2016|2016, Publications|

Crown sealing and buckling instability during water entry of spheres, 2016

Abstract: We present new observations from an experimental investigation of the classical problem of the crown splash and sealing phenomena observed during the impact of spheres onto quiescent liquid pools. In the experiments, a 6 m tall vacuum chamber was used to provide the required ambient conditions from atmospheric pressure down to 1/16th of [...]

July 22nd, 2016|2016, Publications|

The effect of ambient pressure on ejecta sheets from free-surface ablation, 2016

Abstract: We present observations from an experimental study of the ablation of a free liquid surface promoted by a focused laser pulse, causing a rapid discharge of liquid in the form of a very thin conical-shaped sheet. In order to capture the dynamics, we employ a state-of-the-art ultra-high-speed video camera capable of capturing [...]

July 22nd, 2016|2016, Publications|

Elastic spheres walk on water, 2016

Abstract: Incited by public fascination and engineering application, water-skipping of rigid stones and spheres has received considerable study. While these objects can be coaxed to ricochet, elastic spheres demonstrate superior water-skipping ability, but little is known about the effect of large material compliance on water impact physics. Here we show that upon water [...]

July 22nd, 2016|2016, Publications|