1. Experimental study of the turbulent field behind a perforated vortex generator
- Author
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Dominique Della Valle, Hassan Peerhossaini, Ali Al Shaer, Thierry Lemenand, Charbel Habchi, Notre Dame University-Louaize [Lebanon] (NDU), Laboratoire Angevin de Recherche en Ingénierie des Systèmes (LARIS), and Université d'Angers (UA)
- Subjects
Materials science ,FLOW ,020209 energy ,Perforation (oil well) ,turbulence power spectra ,02 engineering and technology ,Vortex generator ,01 natural sciences ,010305 fluids & plasmas ,Physics::Fluid Dynamics ,laser Doppler velocimetry ,[SPI]Engineering Sciences [physics] ,Optics ,Materials Science and Engineering ,HEAT-TRANSFER ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Wake turbulence ,VORTICES ,Wind tunnel ,vorticity ,turbulent kinetic energy ,business.industry ,Mechanical Engineering ,TAB ,Mechanics ,Vorticity ,Condensed Matter Physics ,STATISTICS ,Vortex ,Shear (sheet metal) ,Mechanics of Materials ,Turbulence kinetic energy ,business - Abstract
International audience; The influence of the wake vortex arising behind a perforated tab on the mixing processin heat exchangers and chemical reactors is analyzed. The preliminary step of this study, i.e., investigation of the turbulent field generated by a single perforated tab, is presented here. For this aim, laser Doppler velocimetry measurements are conducted downstream from a perforated trapezoidal vortex generator placed in a wind tunnel. It is shown that two shear layers are generated by the tab. The first shear layer is located at the upper edge of the tab, and the other is ejected from the perforation edges. These shear layers are characterized by high turbulent kinetic energy levels, which are profitable for meso-mixing enhancement. Finally, a spectral study shows that the turbulent macro-scale is nearly the same for typical locations in the shear layers shed from the taband perforation edges.
- Published
- 2015
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