Tangling clustering of inertial particles in stably stratified turbulence

Details Tangling clustering of inertial particles in stably stratified turbulence Tangling clustering of inertial particles in stably stratified turbulence

2009-11-25

arxiv.org/abs/0911.4814v3

Physics

Fluid Dynamics

16 pages, 4 figures, REVTEX4, revised version

Scientific paper

We have predicted theoretically and detected in laboratory experiments a new type of particle clustering (tangling clustering of inertial particles) in a stably stratified turbulence with imposed mean vertical temperature gradient. In this stratified turbulence a spatial distribution of the mean particle number density is nonuniform due to the phenomenon of turbulent thermal diffusion, that results in formation of a gradient of the mean particle number density, \nabla N, and generation of fluctuations of the particle number density by tangling of the gradient, \nabla N, by velocity fluctuations. The mean temperature gradient, \nabla T, produces the temperature fluctuations by tangling of the gradient, \nabla T, by velocity fluctuations. These fluctuations increase the rate of formation of the particle clusters in small scales. In the laboratory stratified turbulence this tangling clustering is much more effective than a pure inertial clustering that has been observed in isothermal turbulence. In particular, in our experiments in oscillating grid isothermal turbulence in air without imposed mean temperature gradient, the inertial clustering is very weak for solid particles with the diameter 10 microns and Reynolds numbers Re =250. Our theoretical predictions are in a good agreement with the obtained experimental results.

Affiliated with

Also associated with

No associations

Rating

Tangling clustering of inertial particles in stably stratified turbulence 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 Tangling clustering of inertial particles in stably stratified turbulence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tangling clustering of inertial particles in stably stratified turbulence will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-623457