abstract in the present article, effective parameters of the buoyant jets have been evaluated in the stagnant ambient fluid. the jet parameters, geometry parameters and environmental parameters are investigated. using dimensional analysis, a set of dimensionless functions was obtained. to achieve the exact functions, a physical model was built in the hydraulic laboratory of shahid chamran unive...

A widely distributed spray is an important feature for atomizer which required in various applications such as gas cooling, turbine combustion, and fluidized bed granulator. Pressure-swirl example of provides a wide angle through the swirling effect inside atomizer. One parameters affecting geometrical constant, K. Another parameter pressure-swirl discharge coefficient, Cd. Discharge coefficien...

This work considers the momentum transport and mass transfer of O2 in a novel aerial rotating disk bioreactor (RDB) for animal cell or tissue culture. Specifically, this design uses a rotating lid placed above the surface of the culture medium to provide a stirring mechanism, which has potential benefits of enhanced gas transfer, reducing possible contamination, and better access to the culture...

Flash ironmaking technology (FIT) is a potential alternative process reducing energy consumption and environmental pollution. The newly proposed counter-current flash has more reasonable temperature concentration distribution, while the high dust rate cannot be avoided. In this study, swirling configuration was introduced to improve control performance. A comprehensive computational fluid dynam...

As a result of the durability problems associated with the first Abrams-Lucas mitral valve, a redesigned model has recently been introduced into limited clinical trials. The new valve was subjected to in-vitro pulsatile flow studies, and measurements were made of mean diastolic pressure gradient and volume of reflux on closure. Similar measurements were made on other mitral valve prostheses of ...

Vortex breakdown (VB) in unconfined swirling jets occurs as either a bubble form of vortex (BVB) or conical (CVB). This computational study examines flow features these forms for Reynolds number at which VB is accompanied by transition to turbulence ( $Re = 1000$ , based on inflow jet radius and centreline velocity). Large eddy simulations were performed with the condition Maxworthy profile mod...

flow passing through lateral intakes and channel junctions is turbulent. sediment flow and bed forms areaffected by these flow patterns and vice versa. in this research, a laboratory study was carried out toexplore a possible method for sediment control for a set of submerged vanes and a single spur dikesimultaneously. since a larger portion of the near-bed flow was diverted, the intake receive...

the hydrodynamic behavior of approaching flow and the amount of sediment entry into right-angled lateral intakes in diversion dams were investigated using a laboratory channel by experimental measurement and observation. the velocity field upstream of the intake in the main channel and before it at the sluice gate was measured at different elevations of flow at different discharge rates of the ...

The paper reviews striking features of swirling flows—collapse, swirl generation, vortex breakdown, hysteresis, and axisymmetry breaking—and the mechanisms involved with the help of conical similarity solutions of the Navier-Stokes equations. The strong accumulation of axial and angular momenta, observed in tornadoes and flows over delta wings, corresponds to collapse, i.e. the singularity deve...