Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
COMPUTATIONAL ANALYSIS OF VORTEX SHEDDING PAST A PIN FIN CONFINED IN A MICROCHANNEL
Submission Author:
Philippe Rollemberg d'Egmont , RJ
Co-Authors:
Philippe Rollemberg d'Egmont, Vinícius Zacharias Martins, Carolina Palma Naveira Cotta, Fernando Pereira Duda, Renato Machado Cotta
Presenter: Philippe Rollemberg d'Egmont
doi://10.26678/ABCM.COBEM2017.COB17-2161
Abstract
The study of fluid flow over confined obstacles in a microchannel is relevant for a variety of microfluidic applications such as microreactors, micromixers, electronics cooling, etc. A numerical study based on the finite volume method has been conducted to investigate the flow behavior through a microchannel with a cylindrical micropin insert. Two different configurations were investigated, first, the symmetry condition was used on the channel's lateral walls, and second, the no-slip condition was used on the channel's walls, which accounts for a confinement situation. The results of the vortex shedding behavior, as well as the confinement effect due to the channel’s stationary walls on Strouhal number and drag coefficient, were analyzed and a good agreement with the literature was observed. As the lateral confinement effect increases, the Strouhal number goes up significantly as well. Furthermore, the increase of microchannel bottom/up walls confinement acts as a buffer, favoring the formation of two fixed and symmetrical vortices behind the cylinder and it shows a suppression of the vortex shedding or, it even prevents the oscillatory flow behind the cylinder. Finally, a comparison with experimental results was performed, and the same behavior of the vortex shedding, including the suppression, was observed, also showing a good agreement with the proposed model and respective numerical simulation.
Keywords
Vortex shedding, 3D numerical simulation, Microchannel
