Crystallization and precipitation engineering—III. A discrete formulation of the agglomeration rate of crystals in a crystallization process

David, René; Marchal, Philippe; Klein, Jean‐Paul; Villermaux, J.

doi:10.1016/0009-2509(91)80130-q

Cited by 104 publications

(86 citation statements)

References 8 publications

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“…These effects and the universal hydrodynamic functions which describe the disturbance of the ambient fluid velocity by the presence of particles are calculated for particles of unequal size. Because not every collision leads to agglomeration the concept of probability of agglomeration is used in agreement with the concepts of David et al [4], Hounslow et al [5] and Baødyga et al [2,6]. However, in the present paper the probability of agglomeration is related to the fine scale structure of turbulence and expressed using multifractal formalism.…”

Section: Introductionmentioning

confidence: 79%

Effects of Fine Scale Turbulent Flow and Mixing in Agglomerative Precipitation

Bałdyga¹,

Jasińska

Krasiński

et al. 2004

Chem Eng & Technol

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Precipitation of a solid product from aqueous ionic solutions, including mixing, fast chemical reaction, nucleation, growth and agglomeration of crystals is considered. This work concentrates on the phenomenon of particle agglomeration which dominates the precipitation process at high supersaturation. Modeling of particle collision includes effects of bulk fluid motion, Brownian diffusion and colloidal forces for particles of equal and unequal size. The concept of probability of agglomeration based on multifractal formalism is introduced and applied. A simplified version of the model is linked to CFD and results of computations are compared with experimental data for barium sulfate precipitation.

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Section: Introductionmentioning

confidence: 79%

Effects of Fine Scale Turbulent Flow and Mixing in Agglomerative Precipitation

Bałdyga¹,

Jasińska

Krasiński

et al. 2004

Chem Eng & Technol

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“…where f (k) is the shape function proposed by David et al [2]. Presented approach requires some discussion.…”

Section: ±3mentioning

confidence: 97%

“…In present investigations the experiments for BaSO 4 precipitation are carried out at high reactant concentrations with the aim to observe agglomeration process. In the theoretical part of this paper agglomeration rate is expressed using adequate collision kernels and expressions for the probability of agglomeration in agreement with the concepts of David et al [2], Hounslow et al [3], and Baødyga et al [4].…”

Section: Introductionmentioning

confidence: 98%

Barium Sulphate Agglomeration in a Pipe – An Experimental Study and CFD Modeling

Bałdyga¹,

Jasińska

Orciuch

2003

Chem Eng & Technol

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Agglomeration effects, observed during precipitation of barium sulphate in the unpremixed feed two-dimensional tubular precipitator, are studied experimentally and interpreted theoretically. Effects of process parameters on precipitation± agglomeration phenomena are predicted using a CFD based model that describes micromixing (the multiple-time-scale turbulent mixer model is used) and precipitation (including nucleation, growth and agglomeration of crystals). Agglomeration rate is defined as a product of the collision frequency and the probability of agglomeration.

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“…England primary and secondary nucleation, chemical-and diffusioncontrolled growth and agglomeration of crystals. David et al (1991a) developed a discrete formulation of the agglomeration rate of adipic acid crystals during crystallization in mechanically stirred crystallizer. The expression relied on fluid mechanics and phenomenological considerations, and accounted for the influence of particle concentration, supersaturation, specific power dissipation, size of crystallizer and size of agglomerating crystals.…”

Section: Introductionmentioning

confidence: 99%