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New closure method for a simultaneous diazo coupling between 1- and 2-Naphthols and diazotized sulphanilic acid

100%
Bałdyga J., Jasińska M.
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vol. 11
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issue 2
1-5
EN
This paper presents the effects of mixing on the course of complex chemical reactions in relation to the manufacturing of pure products at high reaction selectivity, and designing mixing strategies using complex, homogeneous test reaction systems. As an example, the competitive-consecutive and parallel reaction test system including a simultaneous diazo-coupling between 1- and 2-naphtols and diazotized sulphanilic acid is considered. The effect of mixing on the reaction selectivity is interpreted using mechanistic modeling and a new closure scheme. The new closure represents an extension of the conditional PDF closure applied before to simple reaction schemes.
2
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Selection and comparison of equipment for deagglomeration processes

100%
Bałdyga J., Malik K.
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vol. 11
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issue 2
6-12
EN
The unique properties of nanoparticles and nanoparticle clusters show high potential for nanomaterials to be formulated into numerous products. In this paper, nanosuspensions are formulated by braking up agglomerates in high-shear flows. The flows are generated in the specific equipment, and this paper serves as a guide for equipment selection based on mechanistic modelling. A general model based on the power input to the system is formulated to model agglomerate disintegration in different types of equipment including stirred tanks, the rotor-stator disintegrators, the high-pressure nozzle systems and bead mills. The results of computations based on the rate of energy dissipation are presented in terms of the specific energy input, which is typical of industrial applications. In the considered deagglomeration devices the stresses are generated due to various mechanisms including the effects of hydrodynamic stresses, cavitation and bead collisions. The model includes the effects of agglomerate structure on the suspension viscosity. The results of the simulations are compared with the experimental data.
3
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Flow Structure, Drop Deformation and Mass Transfer in Dense Emulsions

100%
Bałdyga J., Jasińska M.
Czasopismo Techniczne
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-
PL
This paper presents applications of a new model of the rheological behaviour of dense oil-inwater emulsions of non-colloidal droplets to describe the flow structure, the effects of the flow of dense emulsion on drop deformation and the related increase of the interfacial area and the mass transfer rate.
4
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Flow Structure, Drop Deformation and Mass Transfer in Dense Emulsions

100%
Bałdyga J., Jasińska M.
Czasopismo Techniczne
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-
PL
This paper presents applications of a new model of the rheological behaviour of dense oil-inwater emulsions of non-colloidal droplets to describe the flow structure, the effects of the flow of dense emulsion on drop deformation and the related increase of the interfacial area and the mass transfer rate.
5
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Power characteristics of in-line rotor stator mixers

81%
Jasińska M., Bałdyga J., Cooke M., Kowalski A. J.
Czasopismo Techniczne
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-
PL
Methods that can be used to predict agitation power of the in-line rotor-stator mixers are considered in this paper. Results of experimental investigations and CFD modeling are presented and interpreted theoretically for the Silverson rotor-stator (150/250) MS mixer. Results of theoretical analysis lead to extended version of previously used correlation.
6
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Large eddy simulation of precipitation process carried out in jet reactors

81%
Makowski Ł., Wojtas K., Orciuch W., Bałdyga J.
Czasopismo Techniczne
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-
PL
The paper presents an application of large eddy simulations to predict a course of precipitation process carried out in selected types of jet reactors. In the first part of this work the simulations results were validated using PIV and PLIF techniques and also by comparing model predictions with experimental data for fast parallel chemical test reactions. In the second part of this work predictions of modeling are compared with experimental data for BaSO4 precipitation. Precipitation model is tested in this part also by comparing predictions of the model based on LES with results obtained using the multiple-time-scale mixing model combined with the k‒e model.
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