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Understanding of turbulence modulation and particle response in a particle-laden jet from direct numerical simulations

Published online by Cambridge University Press:  13 October 2022

Hua Zhou Open the ORCID record for Hua Zhou [Opens in a new window] ,
Evatt R. Hawkes ,
Timothy C.W. Lau ,
Rey Chin Open the ORCID record for Rey Chin [Opens in a new window] ,
Graham J. Nathan  and
Haiou Wang Open the ORCID record for Haiou Wang [Opens in a new window]
Hua Zhou*
Affiliation:
School of Mechanical and Manufacturing Engineering, The University of New South Wales (UNSW), Sydney, NSW 2052, Australia
Evatt R. Hawkes
Affiliation:
School of Mechanical and Manufacturing Engineering, The University of New South Wales (UNSW), Sydney, NSW 2052, Australia
Timothy C.W. Lau
Affiliation:
Center for Energy Technology, School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia UniSA STEM, The University of South Australia, Adelaide, SA 5095, Australia
Rey Chin
Affiliation:
Center for Energy Technology, School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia
Graham J. Nathan
Affiliation:
Center for Energy Technology, School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia
Haiou Wang
Affiliation:
School of Mechanical and Manufacturing Engineering, The University of New South Wales (UNSW), Sydney, NSW 2052, Australia
*
†Email address for correspondence: [email protected]
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Abstract

Point-particle direct numerical simulations have been employed to quantify the turbulence modulation and particle responses in a turbulent particle-laden jet in the two-way coupled regime with an inlet Reynolds number based on bulk velocity and jet diameter $({D_j})$ of ~10 000. The investigation focuses on three cases with inlet bulk Stokes numbers of 0.3, 1.4 and 11.2. Special care is taken to account for the particle–gas slip velocity and non-uniform particle concentrations at the nozzle outlet, enabling a reasonable prediction of particle velocity and concentration fields. Turbulence modulation is quantified by the variation of the gas-phase turbulent kinetic energy (TKE). The presence of the particle phase is found to damp the gas-phase TKE in the near-field region within $5{D_j}$ from the inlet but subsequently increases the TKE in the intermediate region of (5–20)Dj. An analysis of the gas-phase TKE transport equation reveals that the direct impact of the particle phase is to dissipate TKE via the particle-induced source term. However, the finite inertia of the particle phase affects the gas-phase velocity gradients, which indirectly affects the TKE production and dissipation, leading to the observed TKE attenuation and enhancement. Particle response to the gas-phase flow is quantified. Particles are found to exhibit notably stronger response to the gas-phase axial velocity than to the radial velocity. A new dimensionless figure is presented that collapses both the axial and radial components of the particle response as a function of the local Stokes number based on their respective integral length scales.

JFM classification

Multiphase and Particle-laden Flows: Particle/fluid flow Wakes/Jets: Jets Turbulent Flows: Turbulence simulation
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 950 , 10 November 2022 , A3
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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