Velocity distribution and the effect of wall roughness in granular Poiseuille flow

by: KC Vijayakumar, Meheboob Alam

Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), Vol. 75, No. 5. (2007)

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From event-driven simulations of a gravity-driven channel flow of inelastic hard disks, we show that the velocity distribution function remains close to a Gaussian for a wide range densities (even when the Knudsen number is of order 1) if the walls are smooth and the particle collisions are nearly elastic. For dense flows, a transition from a Gaussian to a power-law distribution for the high-velocity tails occurs with increasing dissipation in the center of the channel, irrespective of wall roughness. For a rough wall, the near-wall distribution functions are distinctly different from those in the bulk, even in the quasielastic limit.

@article{citeulike:2883352, abstract = {From event-driven simulations of a gravity-driven channel flow of inelastic hard disks, we show that the velocity distribution function remains close to a Gaussian for a wide range densities (even when the Knudsen number is of order 1) if the walls are smooth and the particle collisions are nearly elastic. For dense flows, a transition from a Gaussian to a power-law distribution for the high-velocity tails occurs with increasing dissipation in the center of the channel, irrespective of wall roughness. For a rough wall, the near-wall distribution functions are distinctly different from those in the bulk, even in the quasielastic limit.}, author = {Vijayakumar, K. C. and Alam, Meheboob }, citeulike-article-id = {2883352}, doi = {10.1103/PhysRevE.75.051306}, journal = {Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)}, keywords = {2007, boundary, distribution, flow, grains, pre, velocity}, number = {5}, posted-at = {2008-06-11 17:11:44}, priority = {2}, publisher = {APS}, title = {Velocity distribution and the effect of wall roughness in granular Poiseuille flow}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PLEEE8000075000005051306000001\&idtype=cvips\&gifs=yes}, volume = {75}, year = {2007} }

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TY - JOUR ID - citeulike:2883352 L3 - citeulike-article-id:2883352 TI - Velocity distribution and the effect of wall roughness in granular Poiseuille flow JF - Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) VL - 75 IS - 5 PB - APS N2 - From event-driven simulations of a gravity-driven channel flow of inelastic hard disks, we show that the velocity distribution function remains close to a Gaussian for a wide range densities (even when the Knudsen number is of order 1) if the walls are smooth and the particle collisions are nearly elastic. For dense flows, a transition from a Gaussian to a power-law distribution for the high-velocity tails occurs with increasing dissipation in the center of the channel, irrespective of wall roughness. For a rough wall, the near-wall distribution functions are distinctly different from those in the bulk, even in the quasielastic limit. KW - 2007 KW - boundary KW - distribution KW - flow KW - grains KW - pre KW - velocity AU - Vijayakumar, KC AU - Alam, Meheboob PY - 2007/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLEEE8000075000005051306000001&idtype=cvips&gifs=yes ER -

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