Heat transfer enhancement in unsteady laminar flow about a cylinder

摘要

The problem of imposing an in-line velocity perturbation on a uniform flow about a fixed cylinder is studied numerically. A finite volume method using SIMPLEC algorithm is applied on a 0-type body fitted co-located grid. The effect of frequency, amplitude and shape of the velocity perturbation on the lift and drag coefficients and on the Nusselt and Strouhal numbers were studied for the case of Re=1000. It is noticed that lock-on is present and have a pronounced effect on Nu increasing it by 8.3 per cent relative the uniform flow value; but with lower effect on Cd and Cl{sub}(max). Also it is concluded that a sinusoidal perturbation with a frequency SC =0.15 and amplitude A/U=0.2 is a better choice.