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The role of rheology in the flow and mixing of complex fluids

Ghorbanian Farah Abadi, Sara (2017)
M.Phil. thesis, University of Birmingham.

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Abstract

Mixing of fluids with complex rheology is encountered more and more frequently in industries. Nonetheless, mixing behaviour of such fluids is still poorly understood due to the complexity of their rheological behaviour. This study aims to enhance fundamental understanding of the flow and mixing of rheologically complex fluids such as thixotropic, shear-thinning and viscoelastic fluids. The objectives of this study were to investigate within stirred vessels the effects of thixotropy and viscoelasticity, separately, in the absence of other rheological behaviours for the fluids examined. To achieve these aims the rheological behaviour of the fluid examined is isolated by using a fluid that exhibits only one of these behaviours of interest at a time. The Particle Image Velocimetry (PIV) technique was employed to characterize the flow fields of fluids. The flow pattern, normalized mean velocity and cavern growth in the vessel were characterized during the mixing for both thixotropic and viscoelastic fluids. The results were compared to the reference fluids under laminar and transition regimes. Three different types of impeller were investigated: Rushton turbine (RTD), and Pitch Blade Turbine (PBT) in up pumping mode (PBTU) and in down pumping mode (PBTD). Additional work was conducted using th Planar Laser Induced Fluorescence (PLIF) visualization technique to investigate in more detail the evolution of mixing in a cavern with time for a thixotropic fluid. The mixing efficiency of the impellers was analyzed in terms of impeller pumping efficiency and size and growth of a cavern.

Type of Work:M.Phil. thesis.
Supervisor(s):Barigou, Mostafa and Simmons, Mark J. H.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemical Engineering
Subjects:QD Chemistry
TP Chemical technology
Institution:University of Birmingham
ID Code:7540
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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