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Effect of guide vane on turbulence characteristics for single-phase flow through 90-degree pipe bend
Author(s): Sumit Saha, Nityananda Nandi
Keywords: 90° pipe bend; Bend curvature ratio; Guide vane; k-ω turbulence model; Numerical analysis; Turbulence characteristics.
The present study expresses the turbulent flow characteristics through 90° pipe bend using numerical method by determining the solutions for Reynolds Averaged Navier-Stokes (RANS) expression using k-ω (SST) turbulence model. For that purpose, numerical analysis has been carried out by solving RANS equations using ANSYS fluent, considering incompressible fluid in turbulent flow conditions. Simulations has been carried out for three different Reynolds number ranging from 1×105 to 10×105 at three different bend curvature ratios (Rc/D = 1, 1.5 and 2). To observe the effect of guide vane and its position on turbulence characteristics, four different positions of guide vane inside the bend has been considered. At first, an analysis was led to make sure that the results obtained from present model are reliable and in line with previous data obtained from similar published experiments and numerical data. A research has been conducted to find out the impact of Reynolds number, bend curvature ratio and position of guide vane on different turbulence characteristics namely; turbulent kinetic energy, turbulent intensity and wall shear stress at bend outlet position. In general, turbulent intensity is found larger for lower bend curvature ratio at the inner wall curvature side. Results for turbulent kinetic energy have similarity in results with turbulent intensity. Significantly, the wall shear stress represented a strong dependency on the circumferential angle at the bend outlet cross-section, and curvature ratio rather than Reynolds number and guide vane positions.