Supersonic Air Flow due to Solid-Liquid Impact
Fluid Dynamics
2010-01-21 v2 Atmospheric and Oceanic Physics
Abstract
A solid object impacting on liquid creates a liquid jet due to the collapse of the impact cavity. Using visualization experiments with smoke particles and multiscale simulations we show that in addition a high-speed air-jet is pushed out of the cavity. Despite an impact velocity of only 1 m/s, this air-jet attains \emph{supersonic} speeds already when the cavity is slightly larger than 1 mm in diameter. The structure of the air flow resembles closely that of compressible flow through a nozzle -- with the key difference that here the "nozzle" is a \emph{liquid} cavity shrinking rapidly in time.
Keywords
Cite
@article{arxiv.0909.3777,
title = {Supersonic Air Flow due to Solid-Liquid Impact},
author = {Stephan Gekle and Ivo Peters and Jose Manuel Gordillo and Devaraj van der Meer and Detlef Lohse},
journal= {arXiv preprint arXiv:0909.3777},
year = {2010}
}