This dissertation was written as a part of the MSc in Energy Systems at the International Hellenic University. Its objective was to examine the flow behavior of cyclone separators that are used as gas cleaners in biomass industries and other industrial applications and exploit the derived gas as an energy source. The fundamental physics that inhere in the pattern of a fluid flow can be the essential tool for the improvement of cyclone performance. The physics of a flow field inside a cyclone is characterized by high complexity, the laws of which are expressed by partial differential equations that are not susceptible by analytical solutions. However they can be solved numerically and this is why commercially available Computational Fluid Dynamics programs are used to perform calculations and evaluate the performance of the cyclone. The work done in this thesis aims to evaluate the most appropriate model used in Computational Fluid Dynamics that describes accurately the flow field of a cyclone as regards a two-phase flow that consists of particles and gas. K-ε and RSM simulations are mainly undertaken with the latter being the most accurate. It is concluded that it is mandatory that Random Discrete Walk Model should be used in combination with a Reynolds Stress Model for a variety of particles injected into the cyclone.
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