dorsal/arxiv
View SchemaTurbulent thermal diffusion in a multi-fan turbulence generator with the imposed mean temperature gradient
| Authors | A. Eidelman, T. Elperin, N. Kleeorin, I. Rogachevskii, I. Sapir-Katiraie |
|---|---|
| Categories | |
| ArXiv ID | physics/0602175 |
| URL | https://arxiv.org/abs/physics/0602175 |
| DOI | 10.1007/s00348-006-0111-3 |
| Journal | Experiments in Fluids, 2006, v. 40, 744-752 |
Abstract
We studied experimentally the effect of turbulent thermal diffusion in a multi-fan turbulence generator which produces a nearly homogeneous and isotropic flow with a small mean velocity. Using Particle Image Velocimetry and Image Processing techniques we showed that in a turbulent flow with an imposed mean vertical temperature gradient (stably stratified flow) particles accumulate in the regions with the mean temperature minimum. These experiments detected the effect of turbulent thermal diffusion in a multi-fan turbulence generator for relatively high Reynolds numbers. The experimental results are in compliance with the results of the previous experimental studies of turbulent thermal diffusion in oscillating grids turbulence (Buchholz et al. 2004; Eidelman et al. 2004). We demonstrated that turbulent thermal diffusion is an universal phenomenon. It occurs independently of the method of turbulence generation, and the qualitative behavior of particle spatial distribution in these very different turbulent flows is similar. Competition between turbulent fluxes caused by turbulent thermal diffusion and turbulent diffusion determines the formation of particle inhomogeneities.
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"abstract": "We studied experimentally the effect of turbulent thermal diffusion in a\nmulti-fan turbulence generator which produces a nearly homogeneous and\nisotropic flow with a small mean velocity. Using Particle Image Velocimetry and\nImage Processing techniques we showed that in a turbulent flow with an imposed\nmean vertical temperature gradient (stably stratified flow) particles\naccumulate in the regions with the mean temperature minimum. These experiments\ndetected the effect of turbulent thermal diffusion in a multi-fan turbulence\ngenerator for relatively high Reynolds numbers. The experimental results are in\ncompliance with the results of the previous experimental studies of turbulent\nthermal diffusion in oscillating grids turbulence (Buchholz et al. 2004;\nEidelman et al. 2004). We demonstrated that turbulent thermal diffusion is an\nuniversal phenomenon. It occurs independently of the method of turbulence\ngeneration, and the qualitative behavior of particle spatial distribution in\nthese very different turbulent flows is similar. Competition between turbulent\nfluxes caused by turbulent thermal diffusion and turbulent diffusion determines\nthe formation of particle inhomogeneities.",
"arxiv_id": "physics/0602175",
"authors": [
"A. Eidelman",
"T. Elperin",
"N. Kleeorin",
"I. Rogachevskii",
"I. Sapir-Katiraie"
],
"categories": [
"physics.flu-dyn"
],
"doi": "10.1007/s00348-006-0111-3",
"journal_ref": "Experiments in Fluids, 2006, v. 40, 744-752",
"title": "Turbulent thermal diffusion in a multi-fan turbulence generator with the imposed mean temperature gradient",
"url": "https://arxiv.org/abs/physics/0602175"
},
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