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Mixing Effects on Particle Precipitation

Madras, Giridhar and McCoy, Benjamin J (2005) Mixing Effects on Particle Precipitation. In: Industrial & Engineering Chemistry Research, 44 (14). pp. 5267-5274.

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A common but complex multiphase chemical reactor process is the mixing of two chemicals to precipitate particles. We build on previous work (Madras, G.; McCoy, B. J., AIChE J., 2004, 50, 835) to study how turbulent mixing influences precipitation reactions. A fragmentation-coalescence model for turbulent dispersal of a limiting reactant A into a homogeneous batch of dissolved B shows how mass transfer controls the reaction rate. The reaction product Q undergoes either hetero- or homogeneous nucleation to form stable nuclei of ppt. that then grow until the supersatn. of Q is exhausted. Nucleation and growth are math. represented by a particle size distribution model that shows how the average precipitate particle size and numbers change with time. The model predicts, in agreement with experimental observations, that increased turbulence reduces the average precipitate particle size.

Item Type: Journal Article
Publication: Industrial & Engineering Chemistry Research
Publisher: American Chemical Society
Additional Information: The Copyright belongs to American Chemical Society.
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 17 Mar 2006
Last Modified: 19 Sep 2010 04:24
URI: http://eprints.iisc.ac.in/id/eprint/5825

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