Abstract
We have succeeded in generation of micro-vortex ring using cavitation phenomena and high speed micro-bubbles laden jet in microfluidic enviromnent. First of all, the relatively large mother bubble is prepared at the tip of the probe by electrically driven bubble generator. As soon as after the mother bubble is collapsed due to by the cavitation, a strong jet is produced which derive the circulating motion in the bubble, and vortex rings are successfully produced eventually. The fluidic force produced by vortex ring is measured by cantilever, and cleaning effect on a wall by vortex ring is also evaluated. These vortex rings has potential to produce share stress to clean the microchannel wall in a closed space which tend to be difficult to be cleaned, and also strong mixing effect is expected to provide efficient reaction which contribute to the field of chemical engineering.
