Some critical transitions in pool flash evaporation

✍ Scribed by Jong-Il Kim; Noam Lior

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 805 KB
• Volume: 40
• Category: Article
• ISSN: 0017-9310
• DOI: 10.1016/s0017-9310(96)00296-7

✦ Synopsis

To improve the fundamental understanding of the physics of the flash evaporation process, pool flash evaporation experiments were conducted in a 152 mm diameter chamber with initial water temperatures of 40-80°C, and superheats of 2-7°C. Several critical transition points were identified or discovered : (1) a critical time at which the rate of ebullition and evaporation diminishes abruptly, (2) an initial water temperature (T~) at which the non-equilibrium temperature difference attains a minimum, (3) a critical initial water temperature at which the expected observed trend of decreasing non-equilibrium temperature difference (NETD) with decreasing depth reverses itself and (4) a critical initial pool depth at which O2(NETD)dT~ changes sign from positive at smaller depths to negative at larger depths.