HEAT TRANSFER AND CROSSFLOW INVESTIGATIONS FOR JET IMPINGEMENT COOLING APPLICATIONS

Jet impingement is widely used in different cooling applications. The accumulation of crossflow as the spent air migrates downstream causes a decay in the overall cooling performance. This study aims to mitigate the undesirable crossflow effects by attaching the so-called-crossflow diverters. Cylindrical, rectangular, and ribbed diverter shapes are numerically studied within a 25-jet array for a range of Rej of up to 10,000. Diverter heights of 3 mm (QL), 6 mm (HL), and 9 mm (TQL), as a percentage of jet-to-target spacing (12 mm) are considered with a constant heat flux condition. Results show an increased Nu from 6.6% to 12%. However, the associated friction factor is also increased by 9.9% – 24.3% on average compared to the baseline model. Consequently, results show a net enhancement of up to 5.2%, 3.1%, and 3.8% for cylindrical, rectangular, and ribbed-type diverters, respectively according to the heat transfer performance parameter (η). ©2024 Abdel Rahman Salem, Ibrahim Soliman, and Ryoichi S. Amano.