Atomistic molecular dynamics simulations reveal the formation of nanojets with velocities up to 400 meters per second, created by pressurized injection of fluid propane through nanoscale convergent gold nozzles with heating or coating of the nozzle exterior surface to prevent formation of thick blocking films. The atomistic description is related to continuum hydrodynamic modeling through the d...

(1) Background: In sprinkler irrigation systems, the water distribution and droplet kinetic energy are affected by shape of nozzle. this paper, effects working pressure aspect ratio (L/D) circular non-circular nozzles (diamond ellipse) on intensity were investigated; (2) Methods: The hydraulic performance a PY15 impact with was assessed under different pressures, diameter, velocity, measured 2D...

Abstract Measurements of sound due to swirl–nozzle interaction are presented. In the experiment a swirl structure was generated by means unsteady tangential injection into steady swirl-free flow upstream from choked convergent–divergent nozzle. Ingestion nozzle caused mass-flow rate change, which resulted in downstream-measured acoustic response. The downstream pressure found remain negative as...

S EPARATION of supersonic flow in a convergent–divergent nozzle is a fundamental fluid phenomenon that affects a large variety of applications, from fuel systems to aircraft engine nozzles. When a supersonic nozzle is operated at pressure ratioswell below its design point, a shock forms inside the nozzle andflowdownstreamof the shock separates from the nozzle walls. Even though flow separation ...

The underexpanded microjet emerging from a rectangular convergent nozzle with high aspect ratio at the exit is investigated numerically using Reynolds-averaged Navier-Stokes (RANS) simulation Menter’s shear stress transport (SST) k-ω turbulence model. performed pressure of 5.0 to produce strong shock and it validated by comparison rainbow schlieren picture microjet. three-dimensional structure ...

Large Eddy Simulation (LES) is applied to investigate the turbulent non-premixed combustion flow, including species concentrations and temperature, in a cylindrical combustor. Gaseous propane (C3H8) is injected through a circular nozzle which is attached at the centre of the combustor inlet. Preheated air with a temperature of 773K is supplied through the annulus surrounding of this fuel nozzle...