Abstract :
The influence of a counter-rotating vortical gust pair is numerically
investigated on a streamlined laminar flow and forced convection heat
transfer around a steadily rotating two-dimensional circular cylinder.
Reynolds number is kept to a fixed value of 100 based on cylinder diameter
(D). The working fluid used is water having a fixed Prandtl number of 7. The
non-dimensional rotation rate is altered within the vortex shedding regime
i.e. 0≤α≤1.5 in the steps of 0.25. The numerical results were computed via
commercially accessible CFD software package FLUENT®. The governing
flow equations are continuity, momentum, and energy equations have been
resolved via constant wall temperature (CWT) boundary condition. The
numerical outcomes are computed illustrating the variation in the lift
coefficient, Strouhal number, average and local Nusselt number, vorticity
and temperature contours around the isothermal rotating cylinder. The
influence of the vortical gust is observed to stretch the shear layer in a
typical manner. The vortical gust can be treated as an additional heat
transfer suppression technique in conjunction with rotation for a circular
cylinder.
Keyword :
vortical gust, laminar flow, vortex shedding regime, rotating cylinder, heat transfer suppression