Estimating the parameters of ultrasonically induced mass transfer and flow of liquids in the pseudomembrane method

• Published in: Chemical engineering and processing 2017-08, Vol.118, p.54-61
• Main Authors: Gradov, O.M., Voshkin, A.A., Zakhodyaeva, Yu. A.
• Format: Article
• Language: English
• Subjects: Acoustic streaming; Bending vibrations; Flow; Nonlinearity; Ultrasound
• ISSN: 0255-2701; 1873-3204
• DOI: 10.1016/j.cep.2017.04.017

•The scheme for implementations of the method being developed has been designed.•The proposed method permits to regulate the mass-exchange process.•The ultrasonic technology provides the noncontact transport of liquids.•Made calculations give total guidelines in the application of the technology. The main features of the effect of acoustic streaming induced in the cylindrical volume of a liquid by the radial vibrations of its walls in the ultrasonic frequency range on mass transfer and transport of liquid fractions in the axial direction have been determined. An analysis of conditions for the effective occurrence of the process under consideration has been performed, and the optimum scheme for the technological implementation of the method being developed has been designed. The problem of self-consistent distribution of liquid flows in different regions of the space occupied by the liquid where extraction occurs has been solved. Its results form a basis for the targeted regulating of the efficiency of physicochemical processes involved and the arrangement of the practical scheme of equipment with required output characteristics. The derived formulas make it possible to calculate the resonance parameters of ultrasound and equipment used, which ensure conditions for achieving the desired efficiency of the phenomenon under study, to determine the radius of droplets into which liquid fractions are broken, to calculate the rate of liquid motion along the axis of the cylinder, and to estimate the critical sizes of the process flow diagram. Formulated analytical relations and computer calculations are aimed at revealing the most significant dependencies that give crucial guidelines in the practical implementation of the technology under study.