The effect of gas bubbles on flash evaporation

✍ Scribed by Noam Lior; Enju Nishiyama

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 438 KB
• Volume: 45
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/0011-9164(83)87032-5

✦ Synopsis

The effect on evaporation rates of air content in flashing water was investigated experimentally in a scaled-down open-channel flash evaporator. The water was at 97°C-98'C, the flash-down temperature differences were up to about Z'C, and air content was up to 6.32 ppm. The ratio (AT /R ), of the local liquid superheat to the equilibrium radius of bubbles w&s sroposed as the correlating parameter for the flash-evaporation heat transfer Stanton Number, and a correlation was developed. The presence of air in the water was found to have an important influence on the process: both the Stanton Number and the approach to equilibrium of the flashing water were seen to improve with air concentration.