Bubble formation by shearing-to-squeezing transition in a T-junction

Abstract A shearing-to-squeezing transition process for bubble formation in a T-junction was reported using microscopy and digital image technology. The investigations were conducted polydimethylsiloxane (PDMS) T-junction. According to the aspect ratio of air slug generation frequency, bubbles generated microchannel identified three types, namely dispersed bubble, short-slug long-slug bubble. corresponding modes as shearing, squeezing modes, respectively. Additionally, microbubble size frequency with various gas pressures velocity liquid flows each mode investigated. relevant dimensional arguments performed characterize new scaling law, based on mechanisms, proposed predict microbubbles showed good agreement experimental results.