CAJ | 학술논문

采用高速摄像仪对T型不等宽微通道分岔口的气泡完全阻塞破裂动力学行为进行了研究。实验以N2作为分散相，含0.5%十二烷基硫酸钠（SDS）的蒸馏水与甘油混合液作为连续相。结果表明：气泡完全阻塞破裂过程可以分为两个阶段：挤压阶段和快速夹断阶段。挤压阶段又可分为快速挤压阶段和慢速挤压阶段，快速挤压阶段尚未发现普遍的变化规律，慢速挤压阶段量纲为1气泡颈部最小宽度与时间存在指数关系：(1?wm/w0)∝t 0.62。表观流速和液相黏度的增加可使颈部变细速率加快，而气泡初始长度对气泡颈部变化的影响可以忽略。在快速夹断阶段，量纲为1气泡颈部最小宽度与剩余时间存在指数关系：wm/w0∝(T?t)0.32。
채용고속섭상의대T형불등관미통도분차구적기포완전조새파렬동역학행위진행료연구。실험이N2작위분산상，함0.5%십이완기류산납（SDS）적증류수여감유혼합액작위련속상。결과표명：기포완전조새파렬과정가이분위량개계단：제압계단화쾌속협단계단。제압계단우가분위쾌속제압계단화만속제압계단，쾌속제압계단상미발현보편적변화규률，만속제압계단량강위1기포경부최소관도여시간존재지수관계：(1?wm/w0)∝t 0.62。표관류속화액상점도적증가가사경부변세속솔가쾌，이기포초시장도대기포경부변화적영향가이홀략。재쾌속협단계단，량강위1기포경부최소관도여잉여시간존재지수관계：wm/w0∝(T?t)0.32。
A high speed camera was used to investigate the dynamics of permanent obstructed bubble break-up in a T-junction with unequal width bifurcations. N2 and distilled water-glycerol solution with 0.5% surfactant sodium dodecyl sulfate (SDS) were used as dispersed and continuous phases, respectively. The process of permanent obstructed bubble break-up could be divided into two stages:squeezing stage and pinch-off stage. The squeezing stage could further be partitioned into fast squeezing stage and slow squeezing stages. During the fast squeezing stage,the change of minimum width of bubble neck could not be generalized. During the slow squeezing stage,the change of dimensionless minimum width of bubble neck with time could be described by a power-law relationship:(1?wm/w0)∝t0.62. The thinning rate of bubble neck would be accelerated with the increase of superficial velocity and liquid viscosity,but was not affected by bubble length. During the pinch-off stage,the change of dimensionless minimum width of bubble neck with remaining time could be described by a power–law relationship:wm/w0∝(T?t)0.32.