Civil and Environmental Engineering Publications
Experimental study of the turbulent field behind a perforated vortex generator
Document Type
Article
Publication Date
2015
Journal
JOURNAL OF APPLIED MECHANICS AND TECHNICAL PHYSICS
Volume
56
Issue
4
First Page
569
URL with Digital Object Identifier
https://doi.org/10.1134/S0021894415040045
Last Page
579
Abstract
The influence of the wake vortex arising behind a perforated tab on the mixing process in 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 tab and perforation edges.