Numerical modeling of dimethyl ether (DME) bubble growth and breakup  

作　　者：ZHANG Peng ZHANG YuSheng 

机构地区：[1]Faculty of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

出　　处：《Chinese Science Bulletin》2009年第14期2457-2463,共7页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 50676036)

摘　　要：A numerical program is written to simulate the process of vapor bubble growth with spherical symmetry from the thermodynamic critical radius in an initially uniformly superheated liquid. The program is validated by the experimental data of superheated water. The calculated results agree with those of experiments well. The program takes into account the variations of properties with temperature precisely to simulate the DME bubble growth under flash boiling conditions. Considering the influences of pressure, surface tension and viscous stress, the linear stability analysis method is adopted to deduce the dispersion equation to represent the disturbance development during the bubble growth, and a new criterion for bubble breakup is established. The results show the bubble becomes more unstable with the increase of bubble Weber number and void fraction, and that with the increase of bubble growth rate or the decrease of initial radius ration of droplet to bubble, the breakup time of bubble becomes shorter.A numerical program is written to simulate the process of vapor bubble growth with spherical symmetry from the thermodynamic critical radius in an initially uniformly superheated liquid. The program is validated by the experimental data of superheated water. The calculated results agree with those of experiments well. The program takes into account the variations of properties with temperature precisely to simulate the DME bubble growth under flash boiling conditions. Considering the influences of pressure, surface tension and viscous stress, the linear stability analysis method is adopted to deduce the dispersion equation to represent the disturbance development during the bubble growth, and a new criterion for bubble breakup is established. The results show the bubble becomes more unstable with the increase of bubble Weber number and void fraction, and that with the increase of bubble growth rate or the decrease of initial radius ration of droplet to bubble, the breakup time of bubble becomes shorter.

关 键 词：数值模拟 汽泡生长 二甲基醚 DME 分裂 定性分析方法 过热液体 临界半径 

分 类 号：O562.1[理学—原子与分子物理] TK121[理学—物理]