Heat transfer from a circular cylinder due to a slot jet impingement

Mass transfer coefficients and fluid flow patterns were determined experimentally for a circular cylinder situated in a crossflow of an impinging slot jet. The effect of offset whereby the cylinder axis is displaced from the symmetry plane of the jet was examined. The effects of the jet generating nozzle width, the cylinder to nozzle separation distance, the offset distance, and the Reynolds number are investigated. Numerical solutions are obtained for a laminar jet. A set of low Reynolds number experiments was performed to compare with the numerical results. Flow visualization experiments show that the jet impinges on the cylinder even when it is in the offset positions, and that the impingement angle increases with increasing Reynolds number and with increasing offset, but decreases with increasing cylinder to nozzle separation distance. Results indicate that the Sherwood number decreases with increasing offset and with increasing the cylinder to nozzle separation distance, but it increases, at a given Reynolds number, with increasing the nozzle width.