Just a stone's throw forms a supersonic jet
in [Physics]
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From: Sam Wormley on 16 Jan 2010 00:57 Just a stone's throw forms a supersonic jet http://www.sciencenews.org/view/generic/id/54965/title/Just_a_stones_throw_forms_a_supersonic_jet Objects hitting water can move air at the speed of sound.
From: Uncle Al on 16 Jan 2010 11:08 Sam Wormley wrote: > > Just a stone's throw forms a supersonic jet > http://www.sciencenews.org/view/generic/id/54965/title/Just_a_stones_throw_forms_a_supersonic_jet > Objects hitting water can move air at the speed of sound. http://physics.aps.org/articles/v3/4 Even the scholarly article evidences a major omission: Pump the system under vacuum to with vigorous stirring to degas the fluid, then seal. Now perform the experiment. With only solvent vapor present there will be no air cushion when liquid surfaces collide. Rather than bounce and slosh there will be energetic cavitation. Collision and collapse will be spectacular. One would then control viscosity with anhydrous ethylene glycol and glycerin rather than water and glycerine, to get the vapor pressure down. The standard fluid for sonic cavitation is concentrated sulfuric acid - but of course that is handled by chemists. One would not trust a physicist with a bottle of glacial acetic acid (dissolves skin to a fare-thee-well). -- Uncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/qz4.htm
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