Numerical Study of Hydrodynamic and Thermal Characteristics in a Rectangular Grooved Duct with Circular Obstacles at Different Positions
Keywords:
Rectangular grooved duct, Circular obstacles, Heat transfer, Turbulent flow, Friction factorAbstract
This study numerically evaluated the impact of the positions of circular obstacles on hydraulic and thermal characteristics in a rectangular grooved channel. Numerical study was solved by the ANSYS Fluent solver. In the study, circular obstacles were placed in the rectangular grooved channel in three different positions (Case 1, Case 2, and Case 3), and the findings were compared to the grooved duct without circular obstacles (Case 0). The walls of the grooved duct were kept at 350 K. The working fluid is air. The study was conducted for different Reynolds numbers (2000 ≤ Re ≤ 10000). The numerical findings were validated with previous study results. The simulation results indicated that the velocity and thermal fields were significantly affected by Reynolds number, position of the circular obstacles, and the geometry of the channel. According to the results, while less pressure drop occurred at the Case 3, the highest pressure drop and heat transfer were obtained at the Case 1. Convection heat transfer improved 1.78 times at Case1 and Re=10000 compared to the Case 0. For all the flow cases, the Nusselt number and the pressure loss increased with the Reynolds number. Thermo-hydraulic performance values decreased with Reynolds number due to the increase in friction factor.
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