Preparation of micro oil droplets in micro-channel by digital jetting

In microfluidic chips, the micro droplet jetting is a key technology to control the droplet volume by micro-channel. The micro droplet in micro-channel is highly concerned on the two-phase or multi-phase slug flow, in which the two-phase streams can form two kinds of micro droplets steadily. This paper focused on the gas-oil two-phase slug flow to realize the digital jetting of the oil droplets. The flow rate of air was fixed to be 10mm(3)/s and of oil was changed to be 4mm(3)/s, 6mm(3)/s, 8mm(3)/s, and 10mm(3)/s. The jetting frequency of oil droplets increased in a linear relationship with the flow rate of oil while the flow rate of air was the same value. The volumes of oil droplets were similar to be 0.5 mm(3) and the gas bubbles were surrounded by oil film.