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Diffusion in Laminar vs Turbulent flows

Posted 31 lug 2015, 18:16 GMT-4 Fluid & Heat, Computational Fluid Dynamics (CFD), Chemical Reaction Engineering, Modeling Tools & Definitions, Parameters, Variables, & Functions 1 Reply

Mark Schulte
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I am modeling a falling film which absorbs a gas. I am interested in how the solute travels normal to the flow. The Laminar flow is a simple solution. However, I am investigating conditions which will likely make the falling film turbulent. I expect that the turbulence will increase the solute transport normal to the bulk flow field, but am not seeing that in my solutions. Can anyone point me to resources about or describe how COMSOL handles the enhancement of diffusion by turbulence?

Any help is much appreciated.

Regards, Mark

(I am using 4.2a, Transport of Diluted species, and the k-epsilon model for turbulence.)
1 Reply Last Post 25 set 2015, 23:29 GMT-4
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Hello Mark Schulte

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Yingjie Ma
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Posted: 9 years ago 25 set 2015, 23:29 GMT-4
If it's tubulent, according to what I knew,the diffusivity should be different from Fick diffudivity. We should introduce tubulent fiffusivity, which produces a new subject called Computational Mass Transfer.
If it's tubulent, according to what I knew,the diffusivity should be different from Fick diffudivity. We should introduce tubulent fiffusivity, which produces a new subject called Computational Mass Transfer.

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