Hydrodynamics and Mass Transfer at the Vortex Stage and during Bubbling

Войнов, Н. А.; Frolov, Alexander S.; Богаткова, А. В.; Земцов, Д. А.; Zhukova, O. P.

doi:10.1134/s0040579519060149

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Dependence of the interfacial surface on energy dissipation. Experimental points for bubbling without a stirrer according to [48] (1-6): D = 0.2-0.5 (m), HL/D = 0.8-1.2; data of the authors when the apparatus was operated according to the intensive dispersion scheme (Figure 1e) at D = 0.3 (m), HL/D = 1.2, ds = 0.064 (m) (7-9): 7-h = 0.05 (m); 8-h = 0.3 (m), one partition; 9-h = 0.3 (m), three partitions; 10- [49] in an apparatus with a turbine stirrer and bubbler.…”

Section: Stirring Powermentioning

confidence: 99%

“…Dependence of the mass transfer coefficient on energy dissipation. Experimental points (1-7) bubbling without a stirrer[48]; 8-stirrer with bubbler (Figure1a),[49] at D = 0.375 (m), H L /D = 1, d s = 0.110 (m), u g = 0.018-0.04 (m/s); 9-the method under study (Figure1e) at H L /D = 1.2, D = 0.280 (m); 10-data[7].…”

mentioning

confidence: 99%

“…Change in the mass transfer coefficient from the parameter ε 0.6 •a 0.8 . Experimental points (1-6) according to[48] during bubbling; (7-9) data of the studied method according to the intensive dispersion scheme (Figure1e): 7-H L = 0.05 (m); 8-H L = 0.3 (m), 1 partition; 9-H L = 0.3 (m), 3 partitions; 10-data[49] apparatus with a stirrer.…”

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confidence: 99%

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Method for Intensive Gas–Liquid Dispersion in a Stirred Tank

et al. 2023

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This article presents the results of hydrodynamics and mass exchange in a stirred tank upon the introduction of gas from an open gas vortex cavity into local liquid regions with reduced pressure. It establishes conditions for the intensive dispersion of gas. Velocity fields and liquid pressure behind the stirrer paddles are determined by numerical simulation in OpenFOAM. The gas content value, gas bubble diameters, and phase surface are determined experimentally. The stirrer power criterion is calculated by taking into account the gas content and power input. The experimental mass transfer data based on the absorption of atmospheric oxygen into water during the dispersion of gas from the open vortex cavity in the local liquid regions behind the rotating stirrer paddles are presented. In this case, the energy dissipation from the rotating stirrer reaches 25 W/kg, with a phase surface of 1000 m−1 and a surface mass transfer coefficient of up to 0.3·10−3 m/s. These parameters are obviously higher than the data obtained in the apparatus for mass exchange through surface vorticity. The advantage of the given method for gas dispersion in a liquid is the functional stability of the apparatus regardless of how deep the stirrer is immersed in the liquid or the temperature or pressure of the gas. Apparatuses based on the intensive gas dispersion method allow for varying the mass transfer coefficient and gas content across a broad range of values. This allows establishing a dependency between the experimentally obtained mass transfer coefficient, energy dissipation, and phase surface values. An equation for calculating the mass transfer coefficient is formulated by taking into account the geometric parameters of the stirrer apparatus based on the stirring power and phase surface values.

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Section: Stirring Powermentioning

confidence: 99%

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confidence: 99%