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 ultr asonic reactor consisting of a double-structured tank. The inner working co mpartment is built with a slant bottom to allow a better ultrasonic transmi ssion. This paper reports the effect of the inclination angle on acoustic e fficiency 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 eff iciency 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. Ha ving optimised the system, the ultrasonic powers in the inner and the outer compartments of the slant bottom reactor were determined by hydrogen perox ide dosimetry. (C) 2000 Elsevier Science B.V. All rights reserved.