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The flow and heat transfer characteristics of twin turbulent slot jets   impinging on planar smooth and rough surfaces are examined using a   computational fluid dynamics model. The interaction between jets lowers the   heat transfer performance of each jet in the zone where the wall jets   collide. A single jet performs better than the equivalent twin jet. The   average heat transfer under twin jets which are injected alternately so that   each one of the pair of jets behaves like a single jet, is found to be better   than twin jets issuing simultaneously. It is proposed that alternating jet   flows in the twin jet arrangement is a simple novel way to enhance thermal   performance of jet pairs. Along with parametric studies of the key flow and   geometric parameters, effects of large temperature differences between the   jet air and the target surface being heated, and model roughness of the   target surface are also evaluated. Interestingly, roughness can lower the   heat transfer performance in the impingement zone as the fluid can get   trapped in the valleys in the rough surface

A computational study of heat transfer under twin turbulent slot jets impinging on planar smooth and rough surfaces