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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL INVESTIGATION OF THE ASYMMETRY EFFECTS ON FLOW AROUND A DECENTRALIZED CIRCULAR CYLINDER CONFINED IN A MICROCHANNEL
Submission Author:
Renato Machado Cotta , RJ
Co-Authors:
Bruno Scaramuzza dos Reis, Vinícius Zacharias Martins, Carolina Palma Naveira Cotta, Renato Machado Cotta, Manish Tiwari
Presenter: Bruno Scaramuzza dos Reis
doi://10.26678/ABCM.ENCIT2020.CIT20-0533
Abstract
The study of the flow over confined cylinders in microchannels is important as a method of heat transfer and mixing enhancement at microscales. A numerical investigation on the two-dimensional flow over a circular cylinder asymmetrically confined in a microchannel, based on the finite volume method, is here reported. The work aimed to evaluate the effect on the flow behavior due to the decentralization of the cylinder at blockages up to 0.60. Results for the Strouhal number, mean value of the drag coefficient and root mean square of the lift coefficient are in good agreement with data from the literature. The time-averaged pressure coefficient on the cylinder surface decreases as the cylinder is moved towards the wall, with an intensified effect at lower blockage ratios. The asymmetric confinement of the cylinder with blockage ratios greater than 0.40 causes a suppression of the beating phenomenon and vortex shedding.
Keywords
Flow over circular cylinder, confinement effect, Vortex shedding, pressure coefficient, Microchannel
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