Akademik Veri Yönetim Sistemi
Applied Thermal Engineering, cilt.298, 2026 (SCI-Expanded, Scopus)
In this study, the heat transfer characteristics of turbulent impinging swirl jets confined by inclined plates are experimentally investigated. Although impinging swirl jets have been widely studied, the combined effects of confinement and plate inclination on local heat transfer distribution and uniformity have not been sufficiently clarified. Experiments were conducted for inclination angles of θ = 0°, 15°, and 30°, Reynolds numbers of Re = 20,000 and 30,000, inter-plate spacing ratios of H/D = 0.5, 1, and 3, and dimensionless swirl numbers of S = 0.125, 0.26, and 0.52 generated using curved-rod inserts. Surface temperature distributions on the impingement plate were measured using infrared thermography, and corresponding local Nusselt number distributions were obtained. In addition to local heat transfer characteristics, a quantitative assessment of heat transfer uniformity was performed to enable a systematic comparison between different configurations. The results show that Nusselt numbers increase with increasing Reynolds number and decrease with increasing inter-plate spacing. Increasing H/D improves heat transfer uniformity up to H/D = 1, beyond which thermal performance deteriorates. Higher swirl numbers lead to a reduction in peak Nusselt values due to the redistribution of axial momentum, while moderate swirl promotes a more uniform heat transfer distribution. The inclination angle significantly affects the flow structure, and an optimal performance is achieved at θ = 15°, where both heat transfer intensity and uniformity are favorably balanced. Overall, the findings demonstrate that the combined effects of confinement, inclination, and swirl play a critical role in determining the thermal performance of impinging jets. The study provides new insight into the trade-off between heat transfer enhancement and uniformity, and offers practical guidance for the design of confined jet cooling systems.