Physics – Fluid Dynamics
Scientific paper
2008-04-17
Physics
Fluid Dynamics
13 pages, 9 figures, RevTex4 macros
Scientific paper
10.1088/1742-5468/2008/07/P07018
The mixing effectiveness, i.e., the enhancement of molecular diffusion, of a flow can be quantified in terms of the suppression of concentration variance of a passive scalar sustained by steady sources and sinks. The mixing enhancement defined this way is the ratio of the RMS fluctuations of the scalar mixed by molecular diffusion alone to the (statistically steady-state) RMS fluctuations of the scalar density in the presence of stirring. This measure of the effectiveness of the stirring is naturally related to the enhancement factor of the equivalent eddy diffusivity over molecular diffusion, and depends on the Peclet number. It was recently noted that the maximum possible mixing enhancement at a given Peclet number depends as well on the structure of the sources and sinks. That is, the mixing efficiency, the effective diffusivity, or the eddy diffusion of a flow generally depends on the sources and sinks of whatever is being stirred. Here we present the results of particle-based simulations quantitatively confirming the source-sink dependence of the mixing enhancement as a function of Peclet number for a model flow.
Doering Charles R.
Eckhardt Bruno
Okabe Takahide
Thiffeault Jean-Luc
No associations
LandOfFree
Mixing effectiveness depends on the source-sink structure: Simulation results does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mixing effectiveness depends on the source-sink structure: Simulation results, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mixing effectiveness depends on the source-sink structure: Simulation results will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-506958