Heat transfer enhancement of multiple impinging slot jets with symmetric exhaust ports and confinement surface protrusions

The present work deals with heat transfer and fluid flow characteristics during laminar multiple impinging slot jets cooling of a flat plate with symmetrical exhaust ports in the confinement surface. Numerical experiments have been carried out for different values of jet Reynolds number, jet-to-plate separation distance, and exhaust port location. Results have been compared with the base case of single slot jet without cross flow. Reduction in the heat transfer rates induced by spent air removal through the symmetric exhaust ports has been found to be significant for a range of geometrical parameters of practical interest. The introduction of confinement surface protrusions, proposed in the present study, has been shown to be effective in reducing the interaction between jet inlet and exhaust flows and enhancing the heat transfer rates. The corresponding increase in pressure drop is practically not significant. The present results and the effectiveness of the configuration proposed in enhancing heat transfer rates are useful for application to practical devices.