Numerical study on heat transfer characteristics near sidewall of impingement/effusion cooling system

While many studies have investigated the heat transfer characteristics of the impingement surface in jet array impingement, limited attention has been given to the heat transfer near the sidewall in impingement/effusion cooling systems. Moreover, predictive correlations for the average Nusselt number on both the impingement surface and the sidewall in impingement/effusion cooling systems remain scarce. In this study, the influences of the hole pitch, the distance between the jet hole and the sidewall, the distance between the jet and impingement plates, and the Reynolds number based on the jet hole diameter on the heat transfer characteristics near the sidewall in an impingement/effusion cooling system were numerically examined. A total of 114 three-dimensional unit cell simulations were performed. The results indicated that the wall jet on the sidewall plays a crucial role in the Nusselt number distribution on the sidewall, similar to the impinging jet on the impingement surface. Additionally, new correlations aimed at predicting the average Nusselt numbers near the sidewall were presented for impingement/effusion cooling systems.