Akademik Veri Yönetim Sistemi
HEAT AND MASS TRANSFER/WAERME- UND STOFFUEBERTRAGUNG, cilt.62, sa.52, ss.1-22, 2026 (SCI-Expanded, Scopus)
In this study, the enhancement of mixed convection heat transfer and the flow structures around obstacles in triple and quadruple obstacle number channels containing triangular head geometry obstacle elements with constant heat flux were numerically investigated using Al2O3-water nanofluid, and the results were compared with those of water. The triple series is arranged with one in the upper left, one in the lower left, and one on the right, while the quadruple series is arranged in pairs symmetrically opposite each other in the vertical plate channel. The numerical examination was carried out by solving the continuity, momentum, and energy equations in a steady, laminar, and two-dimensional flow using the AnsysFluent software. Ansys-Fluent workbench was conducted to solve the mixed convection heat transfer in the duct. The “Second Order Upwind” method was performed for discretising momentum equations due to its superior accuracy and stability. While the gravity force was modelled downwards in the vertically positioned duct, the effect of the buoyancy force was also taken into account. To direct the flow to the warmed triangular head obstacle elements within the channel, f low director fins were placed on the upper inlet surfaces of the channel at 30o and 60o angles. Except for the obstacle elements, all surfaces of the channel and the flow directors are adiabatic. The results of the work were compared with those from experimental and numerical studies in the literature. It was determined that for the warmed obstacle on the upper left of the triple triangular head obstacle serie, Num number is 12.76% higher than the object on the right side in the channel with 60o angled fin and using Al2O3-water nanofluid for the numbers of Re = 1000 and Ri*=150. In addition, it was found that for Re = 1000 and Ri*=150, the PEC value in the 60o angle triple triangular head obstacle serie channel using nanofluid is 8.87% higher than that in the quadruple. In a channel using water with a 30° fin angle, increasing the Ri value from 100 to 150 for Re = 500 causes a 1.23% increase in pressure losses in a triple triangular head obstacle serie, while this increase is 2.21% for a quadruple triangular head obstacle serie.