Experimental and numerical study on energy dissipation in freely cooling granular gases under microgravity

doi:10.1088/1674-1056/27/8/084501

Abstract

Energy dissipation is one of the most important properties of granular gas, which makes its behavior different from that of molecular gas. In this work we report our investigations on the freely-cooling evolution of granular gas under microgravity in a drop tower experiment, and also conduct the molecular dynamics (MD) simulation for comparison. While our experimental and simulation results support Haff's law that the kinetic energy dissipates with time t as E(t)~(1+t/τ)^-2, we modify τ by taking into account the friction dissipation during collisions, and study the effects of number density and particle size on the collision frequency. From the standard deviation of the measured velocity distributions we also verify the energy dissipation law, which is in agreement with Haff's kinetic energy dissipation.

Keywords: granular gas freely cooling microgravity

Received: 08 April 2018
Revised: 17 April 2018
Accepted manuscript online:

PACS:	45.70.-n	(Granular systems)
	45.70.Mg	(Granular flow: mixing, segregation and stratification)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. U1738120 and 11474326).

Corresponding Authors: Mei-Ying Hou
E-mail: mayhou@iphy.ac.cn

Cite this article:

Wen-Guang Wang(王文广), Mei-Ying Hou(厚美瑛), Ke Chen(陈科), Pei-Dong Yu(虞培东), Matthias Sperl Experimental and numerical study on energy dissipation in freely cooling granular gases under microgravity 2018 Chin. Phys. B 27 084501

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Experimental and numerical study on energy dissipation in freely cooling granular gases under microgravity

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