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Influence of gravity on a granular Maxwell’s demon experiment


Isert, N; Maass, C C; Aegerter, C M (2009). Influence of gravity on a granular Maxwell’s demon experiment. European Physical Journal E - Soft Matter and Biological Physics, 28(2):205-210.

Abstract

In the usual description of the granular Maxwell’s demon experiment, where phase separation occurs due to an instability in the densities, the control parameter scales linearly with gravity. In this paper we investigate this scaling experimentally using the properties of diamagnetic particles in strong magnetic-field gradients to reduce and even balance gravitation. We find that phase separation occurs even at vanishingly small gravitational accelerations as is predicted by other theories. This is due to the fact that granular samples tend to form clusters as a result of the inelasticity of the particle collisions. Combining the heat balance of the driven granular gas with the cooling rate and thus the appearance of clustering, we are able to describe the crossover between the limiting cases.

Abstract

In the usual description of the granular Maxwell’s demon experiment, where phase separation occurs due to an instability in the densities, the control parameter scales linearly with gravity. In this paper we investigate this scaling experimentally using the properties of diamagnetic particles in strong magnetic-field gradients to reduce and even balance gravitation. We find that phase separation occurs even at vanishingly small gravitational accelerations as is predicted by other theories. This is due to the fact that granular samples tend to form clusters as a result of the inelasticity of the particle collisions. Combining the heat balance of the driven granular gas with the cooling rate and thus the appearance of clustering, we are able to describe the crossover between the limiting cases.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2009
Deposited On:22 Jan 2010 13:56
Last Modified:05 Apr 2016 13:48
Publisher:Springer
ISSN:1292-8941
Publisher DOI:https://doi.org/10.1140/epje/i2008-10403-7

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