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J. Fluid Mech. (1993). vol. 251, pp. 299-313 Copyright Q 1993 Cambridge University Press
 

Summary: J. Fluid Mech. (1993). vol. 251, pp. 299-313
Copyright Q 1993 Cambridge University Press
299
Shear-induced particle diffusion and longitudinal
velocity fluctuations in a granular-flow mixing layer
By S. S. HSIAU A N D M. L. HUNT
Division of Engineering and Applied Science, California Institute of Technology, Pasadena,
CA 91125, USA
(Received 14 November 1991 and in revised form 8 November 1992)
In flows of granular material, collisions between individual particles result in the
movement of particles in directions transverse to the bulk motion. If the particles were
distinguishable, a macroscopic overview of the transverse motions of the particles
would resemble a self-diffusionof molecules as occurs in a gas. The present granular-
flow study includes measurements of the self-diffusion process, and of the
corresponding profiles of the average velocity and of the streamwisecomponent of the
fluctuating velocity. The experimental facility consists of a vertical channel fed by an
entrance hopper that is divided by a splitter plate. Using differently-coloured but
otherwise identical glass spheres to visualize the diffusion process, the flow resembles
a classic mixing-layer experiment. Unlike molecular motions, the local particle
movements result from shearing of the flow; hence, the diffusion experiments were

  

Source: Adolphs, Ralph - Psychology and Neuroscience, California Institute of Technology

 

Collections: Biology and Medicine