MSc (Eng) Project title Investigating the Effect of Turbulence on Crystallisation Kinetics
(Supervisors: Assoc Prof DA Deglon, Prof AE Lewis and Prof J-P Franzidis) Graduated: 2010
The effect of hydrodynamics on crystallisation kinetics in conventional reactor systems has proved to be challenging. Within such a reactor, there are large variations of hydrodynamics environments where fluid flow is inherently transient and highly turbulent (anisotropic and inhomogeneous). The turbulent energy dissipation and shear rates in these reactors are unevenly distributed and consequently so are the kinetic rates. However, an oscillating grid reactor system produces an environment with a homogeneous and isotropic turbulence. Investigating and characterising crystallisation kinetics in such environments can lead to the understanding of more complex systems that are experienced in industry. In this project the crystallisation kinetics (in particular growth and aggregation) were investigated in an oscillating grid turbulence reactor. The results obtained from this study were compared to those obtained in literature and deductions made on whether precipitation processes can be described by simply averaging the energy input and whether the kinetics depend on the distribution of energy and turbulence.
Oral conference presentations
Mokgethi, B., Lewis, A. E., Deglon, D.A. and Franzidis, J.-P. (2009), “Investigating the effect of turbulence on crystallization kinetics”, SAIMM (Western Cape Branch) Conference, Cape Town, 6-7 August 2009