...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...

... 30 12 2011 23 02 2012 24 02 2012 radial flow flow separation recirculation and reattachment laminar flow vortex Authors acknowledge the support from the Thermo Fluid Research Programme, Jadavpur University funded by the Ministry of Human Resource Development...

... in structure frequency after flow separation at the junction has been plotted against each other. The figure reveals an inevitable linear relationship. This linearity, therefore, offers yet another opportunity to further examine the data. Taking the analysis to the next level, the difference in structure...

... of excursion in the dynamic location of flow separation, particularly when characteristic flow frequencies couple with the mirror housing natural frequency. 31 12 2010 24 10 2011 19 12 2011 19 12 2011 aerodynamics automotive components flow separation flow visualisation mirrors...

... and Aerodynamic Performance of Unswept and Swept-Back Wings,” ASME J. Fluids Eng. , 131 , 111101 . 10.1115/1.4000260 aerodynamics boundary layer turbulence compressible flow flow separation flow simulation Mach number Navier-Stokes equations numerical analysis stagnation flow subsonic flow...

... 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 with cooling/heating, drying, mixing, and chemical vapor deposition (CVD) processes. They are easy to relocate...

.... 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...

... 07 06 2011 07 06 2011 boundary layer turbulence flow separation flow visualisation fractals jets shear turbulence wetting The reattachment lengths are independent of Reynolds number but increased nearly linearly with h / d with the following values: x r / d  = 1.45...

.... 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. 10 12...

... around the cylinder, the current work modified pressure distribution, vortex-shedding characteristics, and aerodynamic forces. 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...

... be traced back to flow separation and vortex formation in the runner and the stator due to low mass flow. During unsteady vortex formation, the vortices in the runner and the vaneless space fluctuate in time and induce in-phase pressure fluctuations in the vaneless space. This occurs on the stable branch...

... along the free shear layer. The reattachment point location, pressure, and wall shear are also significantly influenced by the uncertainties of the coefficients. 28 07 2010 26 02 2011 06 05 2011 06 05 2011 error analysis external flows flow separation flow simulation...

... angle, and only drops slightly at the highest yaw angle. 04 10 2010 09 02 2011 10 03 2011 10 03 2011 boundary layer turbulence flow separation flow visualisation underwater vehicles vortices Tip and junction vortices are characteristic of many different flows...

... 09 2010 29 11 2011 02 03 2011 02 03 2011 boundary layers flow separation flow simulation pipe flow turbulence In Fig. 8 , the results obtained from the ζ − f model are presented. This model provides satisfactory results for the prediction of the 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...