Abstract
Spray formation and characteristics for a superheated hollow-cone swirl spray are experimentally investigated. To prevent any kind of thermal noise pertinent to the phase change, high frequency dielectric heating method is used and laser-based optical technique using Global Sizing Velocimetry (GSV, TSI Inc.) is employed to elucidate the spray characteristics largely altered by complex thermodynamically transition in the void core region. Local spray characteristics are instantly measured and then analyzed on its 2dimensional longitudinal sectional area in terms of dimensionless superheat degree, injection pressure, and nozzle diameter. Flash swirl spray has the relation in the injection pressure and the decline on its mean SMD is larger than that of the sub-cooled liquids. With increasing parameters, its mean SMD linearly decreases and the influence of injection pressure on it increases for the higher dimensionless superheat degree and vice versa. Smaller droplets occur in the void core and they undergo secondary atomization and heterogeneous nucleation with increasing parameters. The region of the secondary droplet jet is axially expanded with increasing dimensionless superheat degree or the injection pressure but it diminishes with that of nozzle diameter.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
