Abstract
Ultrasound was irradiated to a micro channel (1D) and to a thin layer (2D), with their characteristic lengths in the order of a few hundred microns. The flow in the channel and in the thin layer was observed as video images by using a microscope and the occurrences of cavitation phenomena in microspace was confirmed. Furthermore, the resultant sonochemical effects in the microspace were quantified using fluorescent probe as a function of ultrasound power density. The threshold value for the cavitation and their sonochemical efficiencies to produce OH radicals were compared with a conventional sonochemical reactor (3D).
