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Improved pan stirrer performance through CFD modelling

Rackemann, Darryn W. & Broadfoot, Ross (2007) Improved pan stirrer performance through CFD modelling. In International Society of Sugar Cane Technologists.

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Abstract

SRI initiated a project in 2000 to use numerical modelling techniques to improve stirrer designs for batch vacuum pans. The development of a computational fluid dynamics (CFD) model of massecuite circulation within stirred batch pans facilitated the investigation.

An experimental pilot pan was constructed at the Commonwealth Scientific and Industrial Research Organisation (CSIRO), and numerous trials were performed to obtain velocity data at selected positions within the pan for different impeller designs and operating conditions. The measurement technique was based on laser doppler velocimetry (LDV). Factory trials were also conducted on a stirred batch pan and velocity measurements obtained using hot film anemometers. CFD models were developed for the different impeller designs and conditions for both the laboratory and factory pans.

The data from the CFD modelling were matched against the laboratory data from the CSIRO velocity profiles and the factory data to validate the CFD models. The CFD models showed very good agreement to the CSIRO velocity profiles and also predicted the torque (power) applied to the impeller reasonably well. The CFD models also showed reasonable agreement to the factory data.

Using the validated CFD model, an improved impeller design was generated for batch vacuum pans. The new impeller design was manufactured and retrofitted into a stirred pan at an Australian factory in 2004, and its performance was evaluated against data collected using the original impeller.

Comparisons of performance for the new and original impeller blades are detailed. The results show the new impeller blades consume more power but improve the circulation substantially towards the outer regions of the pan and increase the heat transfer coefficient by 15-40%.

Impact and interest:

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ID Code: 9309
Item Type: Conference Paper
Additional Information: Access to the author-version is currently restricted pending permission from the publisher. For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: d.rackemann@qut.edu.au
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Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > INTERDISCIPLINARY ENGINEERING (091500) > Fluidisation and Fluid Mechanics (091504)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CHEMICAL ENGINEERING (090400) > Chemical Engineering Design (090403)
Divisions: Current > Research Centres > Centre for Tropical Crops and Biocommodities
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2007 International Society of Sugar Cane Technologists
Deposited On: 04 Sep 2007
Last Modified: 29 Feb 2012 23:32

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