...Xiao-Dong Liu; Mohamed Farhat; Yao-Jun Li; Zhu-Qing Liu; Wei Yang The efficiency of centrifugal pumps drops sharply when the flowrate is reduced below a threshold value. This is due to a profound change in the flow structure, characterized by a large of portion flow separation near the impeller...

... model is used for the mass transfer due to cavitation. Moreover, the skin-friction coefficient and boundary-vorticity flux (BVF) are used to study the flow separation. Numerical results show that the attached shear layer separates from the boundary layer and then squeezes to form the separation line...

.... This study aims to investigate the flow separation characteristics in a PAT impeller under the BEP condition by numerical method. The hydraulic performance and transient pressure characteristics of PAT predicted numerically were verified through experimentation. The surface friction lines and flow...

... and White [( 6 )]. Similarly, Fig. 3d (Ref. [( 7 )], Fig. 7a ) and Fig. 3e (Ref. [( 7 )], Fig. 6d ) represent the experimental (by using the dye injection method) and numerical results, respectively. It is clearly seen that flows separated from the inner wall after impinging on the outer wall again...

... the junction in the vertical run arm as liquid viscosity increases; however, an increase in liquid viscosity has no effect on flow pattern in the horizontal side arm. 05 09 2011 20 09 2011 23 12 2011 23 12 2011 external flows flow separation mixtures organic compounds pattern...

... of excursion in the dynamic location of flow separation, particularly when characteristic flow frequencies couple with the mirror housing natural frequency. References 1 Achenbach , E. , 1974 , “ Vortex Shedding From Spheres ,” J. Fluid Mech. , 62 ( 2 ), pp. 209 – 221 . 10.1017...

... compressible flow flow separation flow simulation Mach number Navier-Stokes equations numerical analysis stagnation flow subsonic flow viscosity The stall of airfoils is a basic phenomenon in aerodynamics which refers to the significant and sudden loss of lift, increase of drag, and change...

... Flows ,” Exp. Fluids , 20 , pp. 417 – 428 . 10.1007/BF00189380 boundary layer turbulence external flows flow separation flow visualisation jets pipe flow Impinging jets have a variety of technically important applications. Impinging jets have been studied in connection...

.... The visualization of the three-dimensional structures corresponding to the intermediate scales of the flow shows slightly elongated structures preferentially aligned with the jet centerline axis. 01 12 2010 27 07 2011 12 09 2011 12 09 2011 flow separation flow visualisation image...

..., Air-Cooled Heat Exchangers and Cooling Towers: Thermal-Flow Performance Evaluation, Pennwell Corp., Tulsa, OK), can be more than 20% of the total cooling tower flow losses. Flow separation at the lower edge of the shell results in a vena contracta with a distorted inlet velocity distribution...

... 0.5 . 17 04 2010 09 04 2011 07 06 2011 07 06 2011 boundary layer turbulence flow separation flow visualisation fractals jets shear turbulence wetting An offset jet is formed when a jet discharges into a medium above a wall parallel to the axis of the jet...

.... The findings of this study suggest that one stall cell rotates with the impeller at sub-synchronous velocity in the vaneless gap between the impeller and the guide vanes. It is the result of rotating flow separations developed in several consecutive impeller channels which lead to their blockage. Pressure...

.... The angle α could be freely varied by rotating the assembly of the square cylinder and the rod. In order to reduce the drag and to suppress the periodic forces induced by the surface-flow separation and vortex shedding of the square cylinder, flow-control methods, which could alter the flow...

... pump-turbine turbine brake operation numerical simulation CFD measurement runaway speed no load variable boundary conditions flow separation Reversible pump-turbines utilize excess energy available in electrical grids for pump mode operation and produce peak energy in turbine mode...

... is considered an important benchmark problem for testing new developments in the area of CFD as it provides valuable information useful to many practical situations. Many actual flows are characterized by the flow separation of the boundary layer and the subsequent reattachment of the flow downstream, which...

..., which increase the unsteady loading on the propeller and generate significant noise ( 4 ). When the sail is yawed, a tip vortex is also formed, further complicating the flow in the wake and increasing its detection signature. boundary layer turbulence flow separation flow visualisation...

... ). This velocity profile induces a strong adverse pressure gradient that causes the flow to separate and then to reattach. This is unlike the backward-facing step, where the flow separation is due to an abrupt change in the geometry that fixes the point of separation. Here, the prediction of both separation...

... the JSFR cold-leg piping, are tested experimentally to confirm whether a scale effect in pressure fluctuation characteristics exists. A distinguishing peak can be seen in each power spectrum density (PSD) profile of pressure fluctuation obtained in and downstream of the flow separation region for both...

... configuration. Since the gap guides the volute flow back to the impeller flow field near the shroud high-curvature turning area, the low-momentum jet formed by the gap flow could prevent local flow from separation, reducing the local flow turning losses. However, this jet flow has enlarged flow separation...

...P. A. Gregory; P. N. Joubert; M. S. Chong; A. Ooi The ability of eddy-viscosity models to simulate the turbulent wake produced by cross-flow separation over a curved body of revolution is assessed. The results obtained using the standard k − ω model show excessive levels of turbulent kinetic energy...