Results 21 to 30 of about 44,596 (308)
Delay of vortex ring pinchoff by an imposed bulk counterflow [PDF]
, 2004 The Kelvin–Benjamin variational principle has been previously used to predict that vortex ring pinchoff can be delayed if the energy of the leading vortex ring is decreased during formation and/or the energy delivered by the vortex generator is increased.
Dabiri, John O., Gharib, Morteza
core +1 more source
Aerodynamic effect of an alula-like vortex generator using pressure sensitive paint technique
Frontiers in Physics, 2023 Herein, the pressure-sensitive paint (PSP) was used to quantitatively investigate the aerodynamic effect of an alula-like vortex generator, which is a bio-inspired passive flow control structure.
Ping-Han Chung, Szu-I Yeh
doaj +1 more source
Proceeding of First Symposium on Turbulence and Shear Flow Phenomena, 1999 Abstract Vortex generating jets (VGJs) are jets that pass through a wall and into a crossflow to create a dominant streamwise vortex that remains embedded in the boundary layer over the wall. The VGJ is characterized by its pitch and skew angles (Φ and Θ) and the velocity ratio (VR) between the jet and the crossflow. For VR=1.0, the VGJ configuration
Zia U. Khan, James P. Johnston
openaire +1 more source
Generation of Nonlinear Vortex Precursors
Physical Review Letters, 2016 We numerically study the propagation of a few-cycle pulse carrying orbital angular momentum (OAM) through a dense atomic system. Nonlinear precursors consisting of high-order vortex har- monics are generated in the transmitted field due to ultrafast Bloch oscillation.
Chen, Yue-Yue +2 more
openaire +4 more sources
Large microwave generation from d.c. driven magnetic vortex oscillators in magnetic tunnel junctions [PDF]
, 1999 Spin polarized current can excite the magnetization of a ferromagnet through the transfer of spin angular momentum to the local spin system. This pure spin-related transport phenomena leads to alluring possibilities for the achievement of a nanometer ...
Dussaux, A. +12 more
core +5 more sources
Известия высших учебных заведений и энергетических объединенний СНГ: Энергетика, 2018 In a number of foreign countries, vortex heat generators have become widespread in decentralized heat supply systems. For Belarus, vortex heat generators are quite new sources of heat supply.
I. L. Iokova, E. N. Tarasevich
doaj +1 more source
Energies, 2022 The paper presents the results of analytical and experimental studies of the hydrodynamics of the translational−rotational motion of incompressible gas flow within a working space of a variable-geometry vortex heat generator.
Valeriy Nikolsky +6 more
doaj +1 more source
Generalized helical vortex pairs [PDF]
Journal of Fluid Mechanics, 2019 New solutions describing the interaction of helical pairs of counter-rotating vortices are obtained using a vortex filament approach. The vortices are assumed to have a small core size allowing the calculation of the self-induced velocities from the Biot–Savart law using the cutoff theory. These new vortex structures do not possess any helical symmetry
E. Durán Venegas, S. Le Dizès
openaire +6 more sources
Numerical Investigation of Vortex Generator on Controlling Flow Field of Centrifugal Pump Based on Response Surface Method [PDF]
Journal of Applied Fluid MechanicsThe performance and life of centrifugal pumps can be severely impacted by cavitation. In this study, a vortex generator was placed on the blades of the first-stage impeller of a BB4 multistage centrifugal pump to investigate its effect on the local flow ...
N. Qiu, M. Li, J. Wu, H. Zhu, P. Xu
doaj +1 more source
Source Term Modelling of Vane-Type Vortex Generators under Adverse Pressure Gradient in OpenFOAM
Energies, 2019 An analysis of the generation of vortices and their effects by vane-type vortex generators (VGs) positioned on a three-dimensional flat plate with a backward-facing ramp and adverse gradient pressure is carried out.
Iñigo Errasti +3 more
doaj +1 more source