变截面毛细通道中气泡的运动特性分析

Mobility behavior for driving bubble traversing constricted capillary tubes

为了确定复合材料成型过程中气泡的运动条件,利用变截面毛细模拟通道实验系统,研究了气泡在变截面毛细管中的运动行为,分析了气泡长度、毛细管半径及液体种类对气泡垂直穿出行为的影响,并从理论角度推导出气泡穿出的临界压力方程.研究结果表明,气泡垂直穿出变截面毛细通道所需要的临界压力差,随气泡长度和毛细管半径的增大而减小,液体种类对其也有明显影响,实验结果与理论计算值基本吻合.该研究结果将为复合材料成型中工艺参数的优化提供实验依据.

Constricted capillary tubes were used in order to study bubble mobility condition in composite material during cure processing. The effects of bubble length, radius of capillary tube and the variety of liquid on the drive critical condition lary tubes were studied. The of a single bubble traversing through a joint of flow channel of constricted capilresults demonstrate that the critical pressure difference of bubble traversing through joint of constricted capillary tubes perpendicularly decreases with the increase of bubble length or the radius of capillary tube, and is also affected by the variety of liquid obviously. The experimental result tallies with the theoretical results, and the study has a certain reference value to optimize cure processing to reduce and remove voids in composites.