Velocity distributions of granular gases with drag and with long-range interactions.
We study velocity statistics of electrostatically driven granular gases. For two different experiments, (i) nonmagnetic particles in a viscous fluid and (ii) magnetic particles in air, the velocity distribution is non-Maxwellian, and its high-energy tail is exponential, P(upsilon) approximately exp(-/upsilon/). This behavior is consistent with the kinetic theory of driven dissipative particles. For particles immersed in a fluid, viscous damping is responsible for the exponential tail, while for magnetic particles, long-range interactions cause the exponential tail. We conclude that velocity statistics of dissipative gases are sensitive to the fluid environment and to the form of the particle interaction.
Kohlstedt
K
K
Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.
Snezhko
A
A
Sapozhnikov
M V
MV
Aranson
I S
IS
Olafsen
J S
JS
Ben-Naim
E
E
D000392:Air Movements; D000393:Air Pollutants / Q000737:chemistry*; D035843:Biomedical Research; D005740:Gases / Q000737:chemistry*; D007700:Kinetics; D008280:Magnetics; D008560:Membrane Fluidity; D010316:Particle Size; D016008:Statistical Distributions; D013816:Thermodynamics
D000393:Air Pollutants; D005740:Gases