Abstract
Adding nanoparticles into the base fluid and oscillating the target surface are two passive and active techniques, respectively, for heat transfer enhancement. The aim of this paper is to investigate numerically the concurrent use of alumina/water nanofluid and transverse oscillation in convective heat transfer of a heated circular cylinder. Using computational fluid dynamics, unsteady laminar two-dimensional cross-flow for low Reynolds numbers is examined. The governing equations including continuity, momentum and thermal energy are solved by the standard finite volume method. The maximum volume fraction of nanofluid is 3%, while Reynolds numbers are between 100 and 200. The thermophysical properties are assumed to be temperature dependent. The heat transfer and drag coefficients are computed in lock-on regime where the frequency of vortex shedding and applied frequency to the cylinder is equal. Obtained results show that for heat transfer enhancement in cross-flow in the range of studied parameters, using alumina/water nanofluid is more effective than the oscillation of cylinder.
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