摘要
为了探究流体振荡器中气泡碎化特性,采用重整化群(RNG) k-ε湍流模型和流体体积函数(VOF)多相流模型研究流体振荡器中的气液两相流。通过数值模拟分析了气泡在流场中的变形和破碎行为,考察不同流动参数对气泡破碎的影响。同时进行可视化实验,用实验结果验证了模拟的准确性。结果表明,流体振荡器可作为一种新型气泡发生装置。振荡频率越高,流体振荡器中的气泡碎化效果越好;随着液速增大,气泡变形程度加剧,破碎概率增加,生成子气泡也越多;剪切应力和涡流碰撞是导致气泡破碎的主要机制;射流振荡促使气泡向振荡腔壁面偏移,气泡初始直径越大,水平偏移量越大,越容易发生破碎。
In order to explore the characteristics of bubble breakup in a fluidic oscillator, the RNG k-εturbulence model and the VOF multiphase flow model were used to simulate the gas-liquid two-phase flow. The deformation and breakup behaviors of bubbles in the flow field were analyzed by numerical simulation, and the effects of different flow parameters on bubble breakup were investigated. Meanwhile, a visualized experiment was carried out to verify the accuracy of simulation results. The results show that the fluidic oscillator could be used as a new type of bubble generator. High oscillation frequency results in better effect of bubble breakup.With the increase of liquid velocity, the degree of bubble deformation intensifies and the possibility of bubble breakup increases with more new bubbles generated. Shear stress and eddy current are the main mechanisms of bubble breakup. In addition, jet oscillation causes bubble to deviate towards the wall of oscillating cavity. The horizontal offset of the bubble increases at relatively larger initial diameter, which indicates the bubble has a higher probability to break up.
作者
别海燕
李云霞
安维中
李玉龙
薛立成
林子昕
郝宗睿
刘刚
BIE Hai-yan;LI Yun-xia;AN Wei-zhong;LI Yu-long;XUE Li-cheng;LIN Zi-xin;HAO Zong-rui;LIU Gang(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China;Institute of Oceanographic Instrumentation,Qilu University of Technology(Shandong Academy of Sciences),Qingdao 266100,China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2023年第1期53-60,共8页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金(22178329)
山东省自然科学基金(ZR2020ME175,ZR2020QE192)
中央高校基本科研业务费专项(202165002)。
关键词
流体振荡器
气泡破碎
气液两相流
数值模拟
fluidic oscillator
bubble breakup
gas-liquid two-phase flow
numerical simulation
