Journal
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
Volume 47, Issue 12, Pages 2218-2227Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cep.2007.12.003
Keywords
Mixing of non-Newtonian fluids; Cavern; Computational fluid dynamics (CFD); Scaba impeller; Yield stress; Xanthan gum
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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The 3D flow field generated by a Scaba 6SRGT impeller in the agitation of xanthan gum, a pseudoplastic fluid with yield stress, was simulated using the commercial CFD package. The flow was modeled as laminar and a multiple reference frame (MRF) approach was used to solve the discretized equations of motion. The velocity profiles predicted by the simulation agreed well with those measured using ultrasonic Doppler velocimetry, a non-invasive fluid flow measurement technique for opaque systems. Using computed velocity profiles across the impeller, the effect of fluid rheology on the impeller flow number was investigated. The validated CFD model provided useful information regarding the formation of cavern around the impeller in the mixing of yield stress fluids and the size of cavern predicted by the CFD model was in good agreement with that calculated using Elson's model. (C) 2007 Elsevier B.V. All rights reserved.
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