Akademik Veri Yönetim Sistemi
9th CHT-24, ICHMT International Symposium on Advances in Computational Heat Transfer, İstanbul, Türkiye, 26 - 30 Mayıs 2024, ss.529-541
Jet impingement could provide the highest possible heat transfer rates in cooling/heating with air. Hence, there is a wide range of application areas in thermal management using impinging jets. By using various surface modifications on the impingement plate, due to the increase in turbulence intensity and surface area, the thermal performance of impinging jets could be enhanced. In addition, impinging jets are affected by various parameters such as nozzle diameter, jet-to-plate distance, nozzle geometry, jet arrangement, and the geometry and arrangement of protrusions on the impingement surface. Additionally, protrusions on the plate can significantly increase heat transfer by affecting the laminar boundary layer transition to the turbulent boundary layer. The main goal of this study was to show a comparison of heat transfer of impinging jets on smooth surfaces and surfaces with cylindrical protrusions. Therefore, a computational study has been conducted for model with a single entry and a single exit, bounded by three sides and multiple impinging jets has been used. Simulations have been done for Re=9000-32500 and a fin height of 2.5 mm under constant nozzle-to-plate spacing. The validation with experimental data from the literature showed a well agreement. It was observed that a significant increase could be obtained with the addition of cylindrical fins compared to smooth surface at higher Reynolds number.