TY - JOUR
T1 - A Pulse-Echo Ultrasonic Probe for Local Volume Fraction Measurements in Liquid-Liquid Dispersions
AU - Tsouris, Costas
AU - Norato, Michael A.
AU - Tavlarides, Lawrence L.
PY - 1995/9/1
Y1 - 1995/9/1
N2 - A miniaturized ultrasonic probe has been constructed to measure the local volume fraction of immiscible phases in liquid-liquid contactors. The new probe has a 9 mm diameter and varying length and is based on sound pulse-echo measurements. It consists of a sound reflector and an ultrasonic transducer which operates as a transmitter-receiver. The probe has been successfully used to measure the dispersed phase transient volume fraction (holdup) in stirred tanks. Measurements between 0.08 and 0.8 were obtained at the top, bottom, and impeller discharge regions of the tanks. It has been found that local variations in the holdup exist, due to density differences of the two phases, which can be quantified by the new pulse-echo ultrasonic probe. Furthermore, measurements were obtained during phase inversion at which the continuous phase becomes dispersed and the dispersed phase continuous. Scattering and discontinuity is observed in the measurements in the proximity of phase inversion, which may be useful to determine which phase is dispersed and which is continuous.
AB - A miniaturized ultrasonic probe has been constructed to measure the local volume fraction of immiscible phases in liquid-liquid contactors. The new probe has a 9 mm diameter and varying length and is based on sound pulse-echo measurements. It consists of a sound reflector and an ultrasonic transducer which operates as a transmitter-receiver. The probe has been successfully used to measure the dispersed phase transient volume fraction (holdup) in stirred tanks. Measurements between 0.08 and 0.8 were obtained at the top, bottom, and impeller discharge regions of the tanks. It has been found that local variations in the holdup exist, due to density differences of the two phases, which can be quantified by the new pulse-echo ultrasonic probe. Furthermore, measurements were obtained during phase inversion at which the continuous phase becomes dispersed and the dispersed phase continuous. Scattering and discontinuity is observed in the measurements in the proximity of phase inversion, which may be useful to determine which phase is dispersed and which is continuous.
UR - http://www.scopus.com/inward/record.url?scp=0029107692&partnerID=8YFLogxK
U2 - 10.1021/ie00048a029
DO - 10.1021/ie00048a029
M3 - Article
AN - SCOPUS:0029107692
SN - 0888-5885
VL - 34
SP - 3154
EP - 3158
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 9
ER -