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Dive into the research topics where Helena Sovová is active.

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Featured researches published by Helena Sovová.


Chemical Engineering Science | 1981

Breakage and coalescence of drops in a batch stirred vessel—II comparison of model and experiments

Helena Sovová

Abstract The model of dispersion proposed by Coulaloglou and Tavlarides is compared with published results from experiments in batch stirred tanks. An alternative to this model is developed by introducing a different formula for the efficiency of collisions—the mechanism of coalescence of drops by film drainage is replaced by a mechanism based on the effect of collision impact. Good agreement of the modified model with experimental data is demonstrated and the values of the respective parameters are determined.


Chemical Engineering Science | 1976

A new method of measurement of diffusivities of gases in liquids

Helena Sovová; J. Procházka

Abstract A novel method of measurement of diffusivities of gases in liquids has been proposed consisting of measuring the rate of absorption of a gas into a laminar film of liquid flowing radially over the surface of a horizontal disc. The absorption cell works continuously with recirculation of liquid. The profile of velocities in the liquid film was investigated by photochromic technique and was found to be parabolic. A theoretical relationship has been formulated for the rate of absorption. The measurement of the rate of absorption of CO 2 into water and toluene has shown a good agreement with data from literature. The reproducibility is better than 5%.


Chemical Engineering Science | 1983

A Model of dispersion hydrodynamics in a vibrating plate extractor

Helena Sovová

Abstract A stagewise polydisperse model of the Karr vibrating plate extractor hydrodynamics is presented. It describes the drop size distribution and the dispersed phase hold-up as functions of drop transport, breakage and coalescence. 1 The predicted stationary hold-up profiles and drop size distributions are proved to be in good agreement with the experimental data.


Chemical Engineering Science | 1990

Measurement of local velocities of drops in a liquid—liquid extraction vibrating plate column

J. Vohradský; Helena Sovová

Abstract The motion of single-solvent drops in water in the countercurrent Karr column with vibrating plates was examined by means of multiple photography. Profiles of mean residence times along the height of the stage were evaluated from repeated experiments. Mean residence times in the stage were compared with the residence times of drops in the absence of plates. The time delay due to vibrating plates is a function of the intensity of vibration and the velocity of the continuous phase. The ratio of the characteristic velocity to the terminal velocity is lower than 1 and diminishes with increasing intensity of vibration, velocity of the continuous phase and drop size.


Chemical Engineering Science | 1986

Transient behaviour of holdup in a reciprocating plate extraction column

Helena Sovová; Antonín Havlíček

Abstract Transfer functions relating the holdup to the intensity of plate reciprocation and to the velocity of the dispersed phase were determined from experiments in a 4m high VPE reciprocating plate solvent extraction column. The system under investigation was toluene dispersed in water without mass transfer between the phases. An ultrasonic technique of the on-line local holdup measurement was applied. Transfer functions were of first order, with a time lag and with non-linear parameters. A procedure predicting the values of these parameters from the steady-state holdup equations was developed.


Industrial & Engineering Chemistry Research | 1993

Calculations of compressed carbon dioxide viscosities

Helena Sovová; Jaroslav Procházka


Collection of Czechoslovak Chemical Communications | 1984

Measurement of liquid hold-up of the dispersed phase by an ultrasonic method

Antonín Havlíček; Helena Sovová


Collection of Czechoslovak Chemical Communications | 1990

Countercurrent pulsed and reciprocating plate extractors: prediction of Sauter mean drop diameter

Helena Sovová


Collection of Czechoslovak Chemical Communications | 1983

Hold-up and flooding in a vibrating plate extractor

Aleš Heyberger; Helena Sovová; J. Procházka


Collection of Czechoslovak Chemical Communications | 1982

Drop size distributions by power functions of breakage and coalescence

Helena Sovová

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J. Procházka

Czechoslovak Academy of Sciences

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Aleš Heyberger

Czechoslovak Academy of Sciences

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Antonín Havlíček

Czechoslovak Academy of Sciences

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Vladislav Bízek

Czechoslovak Academy of Sciences

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J. Vohradský

Czechoslovak Academy of Sciences

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Jaroslav Procházka

Academy of Sciences of the Czech Republic

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