Experimental Studies of Inverted - Profile Coaxial Jet Flows

Large-eddy simulation of swirling particle-laden flows in a coaxial-jet combustor

Large-eddy simulation (LES) of particle-laden, swirling flow in a coaxial-jet combustor is performed. A mixture of air and lightly loaded, spherical, glass-particles with a prescribed size-distribution enters the primary jet, while a swirling stream of air flows through the annulus. The incompressible, spatially filtered Navier–Stokes equations are solved on unstructured grids to compute the tu...

Experimental and CFD Studies on the Effect of the Jet Position on Mixing Performance

Experimental Results of a Gas Jet Based Beam Profile Monitor*

A novel, least invasive beam profile monitor based on a supersonic gas jet has been developed by the QUASAR Group at the Cockcroft Institute, UK. It allows the measurement of beam profiles for various particle beams across a range of energies and vacuum levels. A finely collimated neutral gas jet, produced by a nozzle and several skimmers, is injected into the vacuum chamber perpendicular to th...

Computations of Torque-Balanced Coaxial Rotor Flows

Interactional aerodynamics has been studied for counter-rotating coaxial rotors in hover. The effects of torque balancing on the performance of coaxial-rotor systems have been investigated. The three-dimensional unsteady Navier-Stokes equations are solved on overset grids using high-order accurate schemes, dual-time stepping, and a hybrid turbulence model. Computational results for an experimen...

Recent Experimental Studies on Microscale Channel Flows

In this paper, we review recent experimental studies on single-phase and multiphase flows in microchannels. Brief overviews of physical phenomena of fluid flow in microchannels, and measurement techniques mainly in conjunction with the flow visualization, are given. Regarding the studies of single-phase flows, the current state-of-the-art of electrokinetics and optofluidics is outlined. Then th...

End-depth in inverted semicircular channels: experimental and theoretical studies

The flow upstream of a free overfall from smooth inverted semicircular channels is theoretically analysed to compute the end-depth ratio (EDR), applying an energy equation based on the Boussinesq assumption. This approach eliminates the need for an experimentally determined pressure coefficient. Experiments were conducted with horizontal channel conditions. The EDR related to the critical depth...