微通道气液同向流动中气泡射流特性

BUBBLE INJECTION DURING COFLOWING AIR-WATER STREAM IN MICROCHANNELS

利用高速CCD成像技术,本文研究了梯形横截面微通道内的气泡喷射流动.通过调节同向流动时空气和水流量,研究了气泡形成的大小和频率等变化特性;以及微通道内的流型变化。实验结果表明,气泡喷射频率随空气流量的增加而增大,同时随水流量的增加而上升,且上升幅度渐趋平缓.

Using high speed CCD imaging system, bubble injection flow is investigate in trapezoid microchannels. By regulating mass flux of air and water during co-flowing, we investigated some characteristics, such as the size and frequency of bubble formation, and also variations of flow patterns in microchannels. Results indicate that frequency of bubble injection increases with mass flux of both air and water, but the rise of frequency flattens gradually with mass flux of water under same mass flux of air.