Visualisation and electrochemical determination of the actives zones in an ultrasonic reactor using 20 and 500 kHz frequencies.

In this paper, active zones of an ultrasonic reactor are underlined by laser tomography and electrochemical measurements.

Double-structured ultrasonic high frequency reactor using an optimised slant bottom.

The present work has been carried out in order to design a new type of ultrasonic reactor consisting of a double-structured tank. The inner working compartment is built with a slant bottom to allow a better ultrasonic transmission. This paper reports the effect of the inclination angle on acoustic efficiency for several different plates, e.g. two plates made of glass (2 mm and 3 mm thickness) and one made of PVC (3 mm thickness). The acoustic efficiency was determined as the ratio of the signal measured by a hydrophone in the presence of the plate to that signal in the absence of the plate. Having optimised the system, the ultrasonic powers in the inner and the outer compartments of the slant bottom reactor were determined by hydrogen peroxide dosimetry.