The convective heat transfer behavior of a heated cylinder located near a plane surface

Abstract

An experimental apparatus which will allow the study of the influence of ground effects on a heated cylinder placed in a crossflow of air was designed and constructed. The effects of a wall on the heat transfer characteristics of a heated cylinder were investigated at a Reynolds number of 153,000 for cylinder to wall spacings ranging from d/r = 0.0 to d/r = 5.33 (maximum), where d = gap width , and r = cylinder radius. Pressure coefficients were obtained at five degree intervals around the cylinder for each experiment. Experimental results obtained for d/r - 0.0 agreed well with previously reported investigations of a cylinder attached to a wall. Results obtained for d/r = 5.33 agreed well with previous work done with free cylinders. Experiments conducted at intermediate values of d/r resulted in minimum and maximum average Nusselt numbers, suggesting that gap spacing may exert a strong influence on the behavior of the flow field.