T型微通道内气液两相流数值模拟.pdfVIP

45 9 西 安 交 通 大 学 学 报 Vol45 No9 2011 9 JOURNAL OF XIAN JIAOT ONG UNIV RSIT Y Sep. 2011 T , , , ( , 710049, ) : 采用相场方法,在湿壁面条件下对T 型微通道内不可压缩气液 相流动进行了模拟研究. 数值模拟中得到微通道内特有气泡 Taylor 气泡形成的过程, 发现其形成共经历了4 个阶段, 气泡在形成过程中主要受到挤压力表面张力黏性力的作用,分析各阶段这3 种力对气泡的作用, 得到T aylor 气泡形成机理.计算结果表明,挤压力和表面张力在气泡整 个形成过程都起作用, 表面 张力在气泡脱离前达到最小值, 黏性力仅在气泡形成前 阶段起作用并在阻塞阶段取得最大值.这 些基本规律为有效控制微通道内气泡尺寸和微通道系统设计提供了一定的依据. : 微通道; 相流; 数值模拟; 相场法; 气泡 : TQ0211 : A : 0253-987X( 2011) 09-0065-05 Numerical Simulation of Gas-Liquid Two-Phase Flow in a T-Junction Micro-Channel WANG Linlin, LI Guojun, T IAN Hui, Y Yanghui ( School of nergy and Power ngineering, Xian Jiaotong U niversity, Xian 710049, China) Abstract: T he numerical simulation was performed to investigate the incompressible gas-liquid two-phase flow in a T-junction micro-channel with wetted walls using a phase field method. The formation process including four stages of a well defined T aylor bubblewas achieved. The Taylor bubble is exerted by three forces in formation process, i. e. , extrusion force, surface tension force and shear stress force of the continuous phase, and the formation mechanism of the Taylor bubble was obtained. T he numerical results show that both the extrusion force and the surface tension force act in the formation process of the Taylor bubble, and the surface tension force rea- ches a minimum value before detachment. T he shear stress force acts only in the preceding two stages of the formation process, and it has a maximum value in the blocking stage Ke words: micro-channel; two-phase flow; numerical simulation; phase field method; bubble