TY - JOUR
T1 - Experimental study on static flash vaporization of aqueous NaCl solution at different flash speed
T2 - Steam-carrying effect
AU - Zhang, Dan
AU - Zhao, Bingchao
AU - Yan, Junjie
AU - Yang, Qingzhong
N1 - Publisher Copyright:
© 2014 Elsevier Ltd. All rights reserved.
PY - 2014/12
Y1 - 2014/12
N2 - Flash speed was defined as mean decreasing rate of non-equilibrium fraction during fast evaporation stage. Experimental study on steam-carrying effect during static flash at different flash speed was carried out. Different flash speeds were generated by installing thin orifice plates with different diameters (5-80 mm) between flash and vacuum chamber. Steam-carrying ratio was defined as mass ratio of entrained liquid to flash steam. Results suggested that, first, accelerating flash speed could significantly increase steam-carrying ratio. Second, a peak value of steam-carrying ratio existed with increasing superheat, but the peak value quickly dropped with shrinking orifice diameters. Third, due to steam-carrying effect, increasing flash speed aggravated height drop of waterfilm during flash, but had nearly no influences on equilibrium salt concentration of waterfilm. At last, an enhanced model for steam-carrying effect during static flash at different flash speed was set up, depend on which, steam-carrying ratio, height drop of waterfilm as well as equilibrium salt concentration of waterfilm could be computed within acceptable error range.
AB - Flash speed was defined as mean decreasing rate of non-equilibrium fraction during fast evaporation stage. Experimental study on steam-carrying effect during static flash at different flash speed was carried out. Different flash speeds were generated by installing thin orifice plates with different diameters (5-80 mm) between flash and vacuum chamber. Steam-carrying ratio was defined as mass ratio of entrained liquid to flash steam. Results suggested that, first, accelerating flash speed could significantly increase steam-carrying ratio. Second, a peak value of steam-carrying ratio existed with increasing superheat, but the peak value quickly dropped with shrinking orifice diameters. Third, due to steam-carrying effect, increasing flash speed aggravated height drop of waterfilm during flash, but had nearly no influences on equilibrium salt concentration of waterfilm. At last, an enhanced model for steam-carrying effect during static flash at different flash speed was set up, depend on which, steam-carrying ratio, height drop of waterfilm as well as equilibrium salt concentration of waterfilm could be computed within acceptable error range.
KW - Aqueous NaCl solution
KW - Equilibrium salt concentration of waterfilm
KW - Flash speed
KW - Height drop of waterfilm
KW - Static flash
KW - Steam-carrying effect
UR - https://www.scopus.com/pages/publications/84907504387
U2 - 10.1016/j.ijheatmasstransfer.2014.08.077
DO - 10.1016/j.ijheatmasstransfer.2014.08.077
M3 - 文章
AN - SCOPUS:84907504387
SN - 0017-9310
VL - 79
SP - 618
EP - 627
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
ER -