- 期刊
Experimental Study on Flash Evaporation under Low-pressure Conditions
摘要
Flash evaporation is extensively used in industrial application. In order to investigate flash evaporation, a new experimental system equipped with the high-speed CCD digital camera and data acquisition instruments is established. Aseries of experiments has been carried out with various initial temperatures from 50.0℃ to 90.5℃, initial water heights of 400 mm to 550 mm, and superheats ranging from 1.5 K to 17.8 K. It is revealed that flashing phenomenon process includes three stages: bubbles generation stage, boiling growth stage and boiling reduction stage. Moreover, the heat transfer characteristics and flow mechanism of each stage has explored. In addition, a correlation between the propagation speed of flash evaporation wave and superheat degree was obtained. Results indicated that the intensity of flash evaporation drastically increases with the increasing of superheat.