A microdevice for producing monodispersed droplets under a jetting flow

Abstract

A new microdevice by extending capillaries into a step microchannel for generating monodispersed droplets was specially designed. A much wider narrowing jetting flow regime can be easily realized in this new device. The new microchannel and the operating regime make it possible to produce monodispersed microdroplets that are one to two magnitudes smaller than the main channel size. Scaling laws of jet diameters and droplet sizes are developed in both theory and experiments. The device turns out to be a good platform for tiny droplet preparation under the jetting flow compared with conventional microchannels.