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| | The writer's name is Christy. My day job is an invoicing officer but I've already utilized for an additional one. My wife and I live in Kentucky. The favorite pastime for him and his kids is to play lacross and he would never give it up.<br><br>Look into my web site; free psychic reading ([http://cartoonkorea.com/ce002/1093612 click through the next website page]) |
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| '''Preferential concentration''' is the tendency of dense particles in a turbulent fluid to cluster in regions of high strain (low vorticity) due to their inertia. The extent by which particles cluster is determined by the [[Stokes number]], defined as <math>St = tau_p / tau_f = (rho_p * d^2 * epsilon^{1/2}) / (18 * rho_f * nu^{3/2})</math>, where <math>tau_p</math> and <math>tau_f</math> are the timescales for the particle and fluid respectively; note that <math>rho_p</math> and <math>rho_f</math> are the mass densities of the fluid and the particle, respectively, <math>nu</math> is the kinematic viscosity of the fluid, and <math>epsilon</math> is the kinetic energy dissipation rate of the turbulence. Maximum preferential concentration occurs at Stokes ~ 1. Particles with <math>St << 1</math> follow fluid streamlines and particles with <math>St >> 1</math> do not respond significantly to the fluid within the times the fluid motions are coherent. | |
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| Systems that can be strongly influenced by the dynamics of preferential concentration are aerosol production of fine powders, spray, emulsifier, and crystallization reactors, pneumatic devices, cloud droplet formation, aerosol transport in the upper atmosphere, and even planet formation from [[protoplanetary nebula]].
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| [[Category:Turbulence]]
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Latest revision as of 20:45, 2 September 2014
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