A FINITE-DIFFERENCE CALCULATION OF FORCED CONVECTIVE HEAT-TRANSFER FROM AN OSCILLATING CYLINDER

A finite difference calculation of forced convective heat transfer fro m an oscillating cylinder is carried out using vorticity, stream funct ion and temperature as the dependent variables. The non-dimensionalize d vorticity transport and energy equations in a non-inertial frame att ached to the cylinder, are solved in a rectangular grid, based on a lo g-polar coordinate system. The effects of cylinder oscillation in the in-line and transverse directions, on the time dependent average Nusse lt number and the Nusselt number distribution on the cylinder surface are investigated for a Reynolds number of 200. Some of the numerical p redictions are compared with experimental data available in the litera ture. In the case of the stationary cylinder, the average Nusselt numb er was found to oscillate at twice the natural shedding frequency. The heat transfer rate from the oscillating cylinder increases with the i ncreasing velocity amplitude. In the case of transverse oscillation. t he location of maximum local Nusselt number was found to oscillate bet ween the upper and lower surface of the cylinder. Contour maps of vort icity, stream line and isotherms are presented and the physical aspect s of the flow field are discussed.