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Title: DNS of differential thermal and mass diffusions in free turbulent shear flows
Authors: Zhou, K
Xiao, M
Jiang, X
Chan, TL 
Keywords: Differential diffusion
Free turbulent shear flows
Issue Date: 2015
Publisher: Elsevier
Source: Procedia engineering, 2015, v. 126, p. 113-117 How to cite?
Journal: Procedia engineering 
Abstract: The diffusion of scalars in turbulent flows is the combined effect of the molecular diffusion and the turbulent diffusion, and the latter usually dominates. We investigated the diffusion of scalars with different diffusivities through two canonical free turbulent shear flows, i.e., the mixing layer and the homogeneous isotropic flow, by means of direct numerical simulation (DNS). In the mixing layer, the molecular diffusion has a big impact on the diffusion of scalars in the laminar region where the scalar gradient is high. In the turbulent region, the molecular diffusion has a negligible effect on the diffusion. In the homogeneous isotropic flow, the higher molecular diffusivity strengths the dispersion of scalars of relatively smaller values. However, the molecular diffusion exhibits a counter effect on the scalar diffusion for the relatively larger value. This work is intended to figure out the feasibility of the assumption that the thermal and mass diffusions of a contaminated content are equal, in other words, unit Lewis number assumption, which is often adopted.
Description: 7th International Conference on Fluid Mechanics, ICFM 2015, 24-27 May 2015
EISSN: 1877-7058
DOI: 10.1016/j.proeng.2015.11.189
Rights: © 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (
Peer-review under responsibility of the Chinese Society of Theoretical and Applied Mechanics (CSTAM)
The following publication Zhou, K., Xiao, M., Jiang, X. & Chan, T. L. (2015). DNS of differential thermal and mass diffusions in free turbulent shear flows. Procedia engineering, 2015, 126, 113-117 is available at
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