Experimental study on flash evaporation from superheated water jets: Influencing factors and formulation of correlation

This paper reports on the influencing factors and their effects on the intensity of flash evaporation that occurs in the superheated water jets. A variety of experiments were conducted and four variables were investigated namely velocity of flow, initial temperature, superheat degree and injection nozzle diameter. An exponentially decaying curve model that predicts temperature variation at the centerline of the upward flowing jet was proposed and employed in the demonstration of the nature of influence of each experimented variable. Evaporation end height was estimated and correlated by an empirical equation; this equation is thought to be useful in designing the flash evaporation chamber.