Kinzel, Matthias ; Holzner, Markus ; Lüthi, Beat ; Tropea, Cameron ; Kinzelbach, Wolfgang ; Oberlack, Martin (2008)
Scaling Laws of Turbulent Diffusion - An Experimental Validation.
14th International Symposium on Applications of Laser Techniques to Fluid Mechanics. Lisbon, Portugal (7-10 July, 2008)
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
From Lie-group (symmetry) analysis of the multi-point correlation equation Oberlack and Guenther Fluid Dyn. Res. 33, 453-476 (2003) found three different solutions for the diffusion of shear-free turbulence: (i) a heat equation like solution when the turbulence diffuses freely into the adjacent calm fluid, (ii) a deceleration wave like solution when there is an upper bound for the integral length scale and (iii) a finite domain solution for the case when rotation is applied to the system. This paper deals with the experimental validation of the theory. We use an oscillating grid to generate turbulence in a water tank and PIV (Particle Image Velocimetry) to determine the two-dimensional velocity and out-of-plane vorticity components. The whole setup is placed on a rotating table. After the forcing is initiated, a turbulent layer develops that is separated from the initially irrotational fluid by a sharp interface, the so-called turbulent/nonturbulent interface (TNTI). The turbulent region grows in time through entrainment of surrounding fluid. We measure the propagation of the TNTI and find good agreement with the theoretical prediction for all three cases.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2008 |
| Autor(en): | Kinzel, Matthias ; Holzner, Markus ; Lüthi, Beat ; Tropea, Cameron ; Kinzelbach, Wolfgang ; Oberlack, Martin |
| Art des Eintrags: | Bibliographie |
| Titel: | Scaling Laws of Turbulent Diffusion - An Experimental Validation |
| Sprache: | Englisch |
| Publikationsjahr: | 2008 |
| Buchtitel: | 14th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, 7-10 July, 2008 |
| Veranstaltungstitel: | 14th International Symposium on Applications of Laser Techniques to Fluid Mechanics |
| Veranstaltungsort: | Lisbon, Portugal |
| Veranstaltungsdatum: | 7-10 July, 2008 |
| Kurzbeschreibung (Abstract): | From Lie-group (symmetry) analysis of the multi-point correlation equation Oberlack and Guenther Fluid Dyn. Res. 33, 453-476 (2003) found three different solutions for the diffusion of shear-free turbulence: (i) a heat equation like solution when the turbulence diffuses freely into the adjacent calm fluid, (ii) a deceleration wave like solution when there is an upper bound for the integral length scale and (iii) a finite domain solution for the case when rotation is applied to the system. This paper deals with the experimental validation of the theory. We use an oscillating grid to generate turbulence in a water tank and PIV (Particle Image Velocimetry) to determine the two-dimensional velocity and out-of-plane vorticity components. The whole setup is placed on a rotating table. After the forcing is initiated, a turbulent layer develops that is separated from the initially irrotational fluid by a sharp interface, the so-called turbulent/nonturbulent interface (TNTI). The turbulent region grows in time through entrainment of surrounding fluid. We measure the propagation of the TNTI and find good agreement with the theoretical prediction for all three cases. |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau > Fachgebiet für Strömungsdynamik (fdy) 16 Fachbereich Maschinenbau |
| Hinterlegungsdatum: | 02 Sep 2011 13:15 |
| Letzte Änderung: | 17 Feb 2014 08:46 |
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