EXAMINATION OF HEAT TRANSFER AND FLOW VISUALIZATION FROM A HEATED TRIANGULAR CYLINDER WITH ATTACHED STAGGERED RIBS MUSAAB K. Rasheed, Salah H Abidoun, Kadhum Audaa Jehhef International Journal of Applied Mechanics and Engineering, 2026 Both numerical and experimental investigations were conducted to study the thermal and flow behavior via natural convection between two vertical walls with a triangular heated cylinder and three staggered plates. The experimental setup featured two vertical adiabatic walls with an aspect ratio of A = 12. Air flowed in from the bottom and exited from the top, which was open to the atmosphere. A horizontally heated triangular cylinder, with a side length of 26 cm, was subjected to constant heat fluxes of 200 W/m², 400 W/m², and 800 W/m². The configurations tested included setups without staggered plates (h = 0.0 cm) and with plates of varying lengths (h = 0.5, 1.0, 1.5, and 2.0 cm) attached to the cavity walls. Numerical simulations were performed using ANSYS FLUENT 2020 to solve the governing equations. The results indicated that the Nusselt number increased with higher Rayleigh numbers, greater heat fluxes, smaller inclination angles, and larger lower surface opening distances. Additionally, incorporating fins of any geometry enhanced the rate of heat transfer. The optimal enhancement in the Nusselt number occurred with ribs, showing increases of 7%, 15%, 38%, and 42% for the cases of h = 0.0 cm, and h = 0.5, 1.0, 1.5, and 2.0 cm, respectively. The experimental data were compared with the numerical results, showing good agreement under identical conditions.
Numerical Investigation of Laminar Flow Structure in U-Bend Duct with Rectangular Heating Source Asmaa Ali Hussein, Mohammed Abood Habib, Faris Ali Badawy, Kadhum Audaa Jehhef International Journal of Heat and Technology, 2025 Thermofluids properties inside the pipe bend with a heat source in the bending section are investigated numerically.In this study, a U-bend pipe with constant diameter and length is utilized for the geometry of 1.5 lengths of inlet and outlet sections and a diameter of 0.5 m equipped with the rectangular heating source with heater width to diameter ratio was w/d=0.06,0.13, 0.21, and 0.26.The heat power input was varied by 100, 200, 400, and 600 W/m 2, and the air flow at Reynolds numbers in the range of 380, 760, 1100, and 1500.The control volume technique was accomplished by ANSYS-Fluent v.2020 to solve a steady, laminar, and fully developed flow with no-slip wall conditions.Air is employed as a working fluid, assuming it is continuous.The continuity equation and the Navier-Stokes equations have been solved.In conclusion, the results showed that the maximum Nu increased by 12, 24, 32, and 45% as used cases of width-to-diameter ratio (w/d = 0.06, 0.13, 0.21, and 0.26) respectively.However, the rate of heat transfer of the source U-tube was augmented by increasing the Reynolds number and the power of the source, and this led to an increase in the Nu was comparable to the coefficient of the heat transfer, and the rate of heat transfer also increased dramatically.
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