Evaporation characteristics of static flash evaporation of aqueous NaCl solution

Vapor quality in static flash evaporation was studied experimentally, using aqueous solution of NaCl at a mass fraction range of 5%-26%, an initial temperature range of 74-104°C, an initial aqueous solution height range of 0.1-0.3 m, and a superheated range of 0.79-42 K. The results showed that increasing concentration of aqueous NaCl solution reduced the vapor quality at a given initial solution temperature and a final equilibrium flash chamber pressure. The effect of concentration became weak at a given superheat (Δ T) and the same aqueous solution height. Vapor quality increased with increasing initial aqueous solution height, but at the same time, vapor quality produced by per unit mass of aqueous NaCl solution decreased. Vapor quality increased linearly with increasing superheat. Based on the experimental results, the dimensionless correlation for vapor quality in static flash evaporation was established.