flow field and heat transfer on the base surface of a finite circular cylinder in crossflow

this work deals with an experimental analysis of the flow field downstream of a finite circular cylinder and of the convective heat transfer coefficient over the wall the cylinder is mounted on. the influence of the cylinder aspect ratio ar and of the reynolds number re are investigated. heat transfer measurements are performed by using infrared thermography along with the heated thin foil heat flux sensor, at four values of re (4,000, 8,000, 16,000 and 32,000) and four values of ar (1, 2, 4 and 8), while flow field measurements are carried out in the cylinder wake at re = 16,000 by means of piv and stereo piv for ar = 2 and 8. the average flow field and the coherent structures are investigated in order to understand their influence on the heat transfer topology and enhancement. some correlations for the heat transfer enhancement are also presented.