Volume 128, Number 6, December 2019
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.