CAJ | 학술논문

运用VOF多相流模型，对丝网分离器内水滴撞击网丝表面沉积水膜的过程进行数值模拟，研究和预测大水滴在较高汽速条件下撞壁产生二次携带的机理。深入研究水滴因素，如水滴大小、初始速度和水膜厚度对丝网的二次携带现象的影响，为丝网分离器设计提供参考。数值结果分析表明，水滴的大小和撞击速度是影响撞击飞溅发生的主要原因，飞溅生成的二次小水滴是造水装置丝网分离器二次携带的重要组成。丝网分离器内水滴撞击网丝水膜能否发生二次携带取决于阈值 Kcr ＝ Oh · Rea ，当 K大于K cr时必然产生二次携带。
운용VOF다상류모형，대사망분리기내수적당격망사표면침적수막적과정진행수치모의，연구화예측대수적재교고기속조건하당벽산생이차휴대적궤리。심입연구수적인소，여수적대소、초시속도화수막후도대사망적이차휴대현상적영향，위사망분리기설계제공삼고。수치결과분석표명，수적적대소화당격속도시영향당격비천발생적주요원인，비천생성적이차소수적시조수장치사망분리기이차휴대적중요조성。사망분리기내수적당격망사수막능부발생이차휴대취결우역치 Kcr ＝ Oh · Rea ，당 K대우K cr시필연산생이차휴대。
Numerical study on the process of water droplet impinging initially on water film deposited on wire mesh surface in wire mesh demister was carried out through the VOF multiphase flow model to predict the mechanism of re-entrainment caused by big droplets under rather high steam velocity . In this paper , an intensive numerical simulation to study and evaluate the influencing factors of droplets ,such as droplet size , initial velocity and water film thickness on re-entrainment phenomenon ,was presented to support the design of wire mesh demister .Numerical results show that water droplet size and impacting velocity are the two main factors to influence the occurrence of splash ,and the resulting secondary small droplets are the important proportion of the re-entrainment in a wire mesh demister of freshwater generator .Whether or not splash occurs when a big droplet impinging onto the wire mesh depends on the threshold Kcr=Oh· Rea .And when the value of K is greater than Kcr ,the re-entrainment will appear definitely .