Abstract
Dynamics of droplet, which utilizes the spatial-temporal localized liquid energy to realize chemical processes in the gas phase in a microchannel, was experimentally investigated using a high-speed camera under the microscope observation. The velocity of 1.6 nL droplet became constant (220 mm s ) due to the damping force after short from launcher by applying 20 kPa of air pressure. The droplet terminal velocities increased in proportion to the magnitude of the applied air pressure (50 to 200 kPa). The behaviors of droplet collision in a chamber seeded with fluorescent particles were investigated. The bullet droplet was penetrated into the target droplet although both droplets had the same cross section. The deformation is strongly suppressed by the channel structure, thus stable collision and efficient utilization of the droplet energy are possible. These results show usefulness to estimate the localized energy, to improve the system for realizing the extreme performance, and to extend the applications of the microfluidic devices.