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In this paper, the fluid flow and heat transfer characteristics of a small rectangular channel fitted with triangular protrusions have been studied in a three-dimensional computational domain. A hybrid cooling strategy employing forced convection air stream with jet impingement on the protruded surface has been numerically studied by solving the conservation equations for mass, momentum, energy as well as turbulent kinetic energy and its dissipation rate in the frame work of finite volume method. The duct and nozzle Reynolds numbers and Prandtl number are varied in the range of 17; 827 Re Dh;duct 53; 480, 5; 135 Re Dh;nz 12; 044 and 0:7 Pr 12, respectively. The effects of the duct Reynolds number, nozzle Reynolds number and Prandtl number on heat transfer rate have been quantified. Extensive numerical computation has also been executed to collect the data for Nusselt number by varying each of the independent parameters. A non-linear regression analysis based on Lvenberg-Marquardt (L-M) method has been used to fit a correlation for Nusselt number utilizing the data captured from CFD analysis. adhana(0123456789().,-volV)FT3 ](0123456789().,-volV)

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 (Re Dh;duct ) and the nozzle Reynolds number (Re Dh;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.

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