Comparison of ultrasound effects in different reactors at 20 kHz

To compare the performances of three power ultrasonic devices at 20 kHz: a horn, a cup horn and a tube, the local intensity distributions of local eff ects of cavitation have been investigated. The sensor is an electrochemical probe, measuring the solid-liquid mass transfer rate, related to the cavit ation intensity. The axial and radial profiles of mass transfer coefficient s have been investigated in three devices, at various power inputs. In all these equipments very strong heterogeneities have been characterized, wheth er a standing wave appears or not. (C) 1998 Elsevier Science B.V. All right s reserved.