Turbulence collapses at a threshold particle loading in a dilute particle-gas suspension

Kumaran, V and Muramulla, NSP and Tyagi, A and Goswami, PS (2019) Turbulence collapses at a threshold particle loading in a dilute particle-gas suspension. In: EPL, 128 (6).

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Abstract

Direct Numerical Simulations (DNS) of the flow of a particle-gas suspension in a channel have been carried out to examine the turbulence attenuation due to particles. As the volume fraction is increased in the range 0-3.5 � 10-3, there is a discontinuous decrease in the turbulent velocity fluctuations at a critical volume fraction. The turbulent energy production rate decreases by an order of magnitude, accompanied by a much smaller increase in the energy dissipation due to particle drag, resulting in a decrease in the total energy dissipation. In contrast to the current understanding, the results show that turbulence attenuation is a discontinuous process, and is due to a disruption of the turbulent energy production mechanism, and not due to the increased dissipation due to the particles. .

Item Type:	Journal Article
Publication:	EPL
Publisher:	Institute of Physics Publishing
Additional Information:	The copyright of this article belongs to Institute of Physics Publishing
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	11 Aug 2020 10:14
Last Modified:	11 Aug 2020 10:14
URI:	http://eprints.iisc.ac.in/id/eprint/64924

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