(4)A study of flow interference and heat transfer between two-cylinders at different orientations
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Shardul Vikram Singh, Praneeti Mitra, Pankaj Kumar∗
Department of Mechanical Engineering, College of Engineering & Technology, SRM Institute of Science and Technology, Kattankulathur 603203, India
Received 5 June 2020; received in revised form 31 December 2020; accepted 1 January 2021
Available online 3 January 2021
Abstract
A numerical investigation is carried out for the different orientations of a circular cylinder where the upstream cylinder moves with
varying angles α = 0˚, 30˚, 45˚, 60˚, 90˚ with respect to the downstream cylinder in a fixed position at a gap ratio (L/D) of 3 where L is the
distance from centre to centre between cylinders and D is the diameter of the cylinder. Reynolds number (Re), is based on cylinder diameter,
is kept constant at 200 for all the cases with air as the working medium. The vortex shedding formation is analysed when the vortices from
the upwind cylinder interact with the downwind cylinder and give impressive flow patterns. It is observed that the drag and lift coefficients
increase for both the cylinders with change in angular position. Strouhal number is calculated with the help of Fast Fourier transformation
(FFT) of vorticity magnitude and evaluated for each case. It is observed that the effect of upwind cylinder on downwind cylinder is significant
for α = 30˚, 45˚, 60˚ orientation cases and vortex shedding frequency increases for these cases. Further, the investigation is extending on the
laminar forced convection heat transfer performance and variation of Nusselt number for the cylinders. Maximum heat transfer is observed
for the downwind cylinder at α = 45˚. In contrast, the local Nusselt number does not vary much for the cylinders except for the downwind
cylinder at α = 0˚.
© 2021 Shanghai Jiaotong University. Published by Elsevier B.V.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Keywords: Tandem cylinder; Vortex shedding; Nusselt number; Strouhal number.