Journal of Loss Prevention in the Process Industries ( IF 3.5 ) Pub Date : 2020-05-19 , DOI: 10.1016/j.jlp.2020.104181 Jingjie Ren , Bo Zhao , Cheng Wang , Mingshu Bi
In this study, the strong boiling process of a superheated liquid induced by pressure relief at the top of a vertical vessel was experimentally investigated. Through monitoring the response of the pressure at the top of the vessel and the full field morphology of the two-phase flow, the correlations between the pressure rise and the two-phase flow as well as the trend of the characteristic pressure values under different discharge areas and filling rates were analyzed. The results indicated that the expansion of the mist-like two-phase flow, which was generated due to the strong boiling and bubble collapse, was the direct reason for the two pressure rebounds at the top of the vessel. And under the effect of the intermittent expansion of the two-phase flow, the pressure rising rate in the second rebound stage fluctuated. When the discharge area changed, the characteristic pressure values presented different relativeness under different filling rates. In addition, the average pressure rising rate during the second pressure rebound process presented an exponential growth with the increase of the discharge area, and the exponent coefficient decreased with the increase of the liquid filling rate.
中文翻译:
垂直容器顶部泄压引起强沸腾特性的实验研究
在这项研究中,通过对垂直容器顶部的压力释放引起的过热液体的强沸腾过程进行了实验研究。通过监测容器顶部压力的响应和两相流的全场形态,可以观察到压力上升与两相流之间的相关性以及不同排放下特征压力值的趋势。分析了面积和填充率。结果表明,由于强烈的沸腾和气泡破裂而产生的雾状两相流膨胀是容器顶部两个压力回弹的直接原因。并且在两相流的间歇膨胀的影响下,第二回弹阶段的压力上升速率发生波动。当排出面积改变时,在不同的填充率下,特征压力值表现出不同的相对性。此外,第二次压力回弹过程中的平均压力上升率随排放面积的增加呈指数增长,而指数系数随液体填充率的增加而下降。