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Velocity fluctuations of initially stratified sedimenting spheres

by: Shang Y Tee, PJ Mucha, MP Brenner, DA Weitz
Physics of Fluids, Vol. 19, No. 11. (2007)

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1. Stratification: volume fraction gradient PIV: shift small parts of images to find their velocities at the maximum fit, which is great if you have blur images.

2. Fig.2 indicate how stratification influcence the flucatuation. The bigger the gradient is, the quicker for denser particle groups to find the proper height for them. Many previous experiments about flucatuations didn't consider the influcence of the gradient, which turns out to be important here

3. Fig.3 : No matter what direction of the velocity, they all are affected by large gradients.

4. Sedimentation and fluidazation Sedimentation is just letting particles settling down Fluidization is pumping fluid up and make particles stablized.



Reviewed by dchen - 2008-03-27 02:10:57

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