论文信息 - Comparison of ultrasound effects in different reactors at 20 kHz.

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 effects of cavitation have been investigated. The sensor is an electrochemical probe, measuring the solid-liquid mass transfer rate, related to the cavitation intensity. The axial and radial profiles of mass transfer coefficients have been investigated in three devices, at various power inputs. In all these equipments very strong heterogeneities have been characterized, whether a standing wave appears or not.

[1] C. Gourdon,et al. A comparative study of local sensors of power ultrasound effects: electrochemical, thermoelectrical and chemical probes. , 1998, Ultrasonics sonochemistry.

[2] R. Orwell. Piezoelectric flexure transducer elements , 1963 .

[3] Takahi Hasegawa,et al. Acoustic‐Radiation Force on a Solid Elastic Sphere , 1969 .

[4] W. Fry,et al. Determination of Absolute Sound Levels and Acoustic Absorption Coefficients by Thermocouple Probes—Theory , 1954 .

[5] A. Wilhelm,et al. Chemical reactions under ultrasound: discrimination of chemical and physical effects , 1994 .

[6] B. Pugin,et al. Qualitative characterization of ultrasound reactors for heterogeneous sonochemistry , 1987 .

[7] C. J. Martin,et al. Design of thermistor probes for measurement of ultrasound intensity distributions , 1983 .

[8] R C Chivers,et al. Measurement of ultrasonic exposure with radiation force and thermal methods. , 1976, Ultrasonics.

[9] C. J. Martin,et al. The use of thermistor probes to measure energy distribution in ultrasound fields. , 1980, Ultrasonics.

[10] A. Wilhelm,et al. Electrochemical determination of the active zones in a high-frequency ultrasonic reactor , 1996 .