Granular Flow, Collisional Cooling and Charged Grains

Details Granular Flow, Collisional Cooling and Charged Grains Granular Flow, Collisional Cooling and Charged Grains

1999-09-14

arxiv.org/abs/cond-mat/9909205v1

Physics

Condensed Matter

Statistical Mechanics

13 pages, 0 figures

Scientific paper

10.1016/S0378-4371(99)00434-3

The non-Newtonian character of granular flow in a vertical pipe is analyzed. The time evolution of the flow velocity and the velocity fluctuations (or granular temperature) is derived. The steady state velocity has a power law dependence on the pipe width with an exponent between 3/4 and 3/2. The flow becomes faster the more efficient the collisional cooling is, provided the density remains low enough. The dependence of collisional cooling on the solid fraction, the restitution coefficient and a possible electric charge of all grains is discussed in detail.

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