| Issue |
EPL
Volume 128, Number 6, December 2019
|
|
|---|---|---|
| Article Number | 64001 | |
| Number of page(s) | 7 | |
| Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/128/64001 | |
| Published online | 05 February 2020 | |
Turbulence collapses at a threshold particle loading in a dilute particle-gas suspension
1 Department of Chemical Engineering, Indian Institute of Science - Bangalore 560 012, India
2 Department of Chemical Engineering, Indian Institute of Technology Bombay - Mumbai 400 076, India
Received: 19 August 2019
Accepted: 20 December 2019
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 
, 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.
PACS: 47.55.Kf – Particle-laden flows / 47.27.E- – Turbulence simulation and modeling
© EPLA, 2020
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