化工学报2016，Vol.67Issue(10)：4153-4159,7.DOI:10.11949/j.issn.0438-1157.20160545
Jakob数在高温高压闪蒸过程中的作用及影响
Role and influence of characteristic Jakob number in high-temperature and high-pressure flash evaporation process
摘要
Abstract
The dimensionless Jakob number (Ja) as a ratio of sensible heat to latent heat of vaporization in a phase change process was chosen as the characteristic parameter for flash evaporation process. The evolution of flash efficiencyversusJawas studied on a newly-designed experimental system for high-temperature and high-pressure spray flash evaporation under different operating conditions. The experimental results showed that flash efficiency was higher and flash evaporation was more violent at largerJa. The flash efficiency increased with the increase of initial liquid temperature but decreased with the increase of evaporation pressure, which was closely related to the physical meaning ofJa. Based on the fact that both flash efficiency andJa were increasing functions of the degree of superheat, a combination of high initial temperature and evaporation pressure was beneficial for flash evaporation under the same degree of superheat. An empirical equation between flash efficiency andJa was developed from the experimental data. The findings were considered universal in the field of flash evaporations at high-temperature and high-pressure and thus could be a useful reference for industrial application.关键词
闪蒸/高温高压/Jakob数/闪蒸效率/相变/蒸发/两相流Key words
flash evaporation/high-temperature and high-pressure/Jakob number/flash efficiency/phase change/evaporation/two-phase flow分类
能源科技引用本文复制引用
季璨,王乃华,崔峥,程林..Jakob数在高温高压闪蒸过程中的作用及影响[J].化工学报,2016,67(10):4153-4159,7.基金项目
国家重点基础研究发展计划项目（2013CB228305）。@@@@Foundation item：supported by the National Basic Research Program of China (2013CB228305) （2013CB228305）
