Akademik Veri Yönetim Sistemi
HEAT AND MASS TRANSFER, cilt.62, sa.2, 2026 (SCI-Expanded, Scopus)
This study presents an experimental investigation of heat transfer enhancement from different surface configurations under natural and forced convection in a rectangular air duct, with relevance to thermal control approaches in building, landscape and environmental engineering applications. Experiments were conducted using a TecQuipment TD1005 unit to compare the thermal performance of a flat plate, a rectangular fin array, and a cylindrical tube bundle under identical heating and airflow conditions. Surface and base temperatures were measured to determine heat transfer coefficients and Nusselt numbers over a range of airflow velocities and applied heat fluxes. The novelty of this work lies in the direct experimental comparison of finned surfaces with different geometries in a ducted configuration, focusing on the combined effects of surface area modification and airflow under both natural and forced convection. The influence of surface geometry on temperature distribution along the fins was also examined. The results show that finned surfaces significantly outperform the flat plate. Under natural convection, finned configurations enhance heat transfer by approximately 200%, while under forced convection this improvement reaches up to 900%. Results indicate that cylindrical fins provide about 5% higher heat transfer performance than rectangular fins under similar conditions. However, rectangular fins exhibit more uniform temperature distributions and advantages in fabrication and integration. Increasing airflow velocity under forced convection reduces temperature gradients and improves cooling effectiveness. These findings provide quantitative insight into the effects of surface geometry and airflow on convective heat transfer and support the optimization of finned surfaces in thermal management applications.