Heat transfer correlation for a cross-flow jet impingement on a protruded surface

This study proposed the heat transfer correlation for a surface tted with rectangular ribs by solving the continuity, momentum, energy, and turbulence equations by the nite volume approach. Extensive computations were performed to modify both the duct Reynolds number (ReDh;duct) and the nozzle Reynolds number (ReDh;nz) in the range of 6,000{20,000. The volume fraction () and the Prandtl number (Pr) of the nano uid varied in the range of 0 to 5% and 7.288 to 9.92, respectively. The number of protrusions (n) varied from 1 to 4. The data collected from numerical experimentation were regressed nonlinearly using Levenberg and Marquest (L-M) method to obtain an empirical correlation for the Nusselt number. The Nusselt number predicted from the correlation was compared with its value obtained from the computations. Close agreement between the predicted and computed Nusselt numbers was observed. In terms of heat transfer augmentation, the duct Reynolds number, the nozzle Reynolds number, and the volume fraction of nano uid were found to be some of the signi cant in uencing parameters in heat transfer. © 2020 Sharif University of Technology. All rights reserved.