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Experiment and modelling of birefringent flows using commercial CFD code

Tomlinson, R.A., Pugh, D. and Beck, S.B.M. (2006) Experiment and modelling of birefringent flows using commercial CFD code. International Journal of Heat and Fluid Flow, 27 (6). pp. 1054-1060. ISSN 0142727X

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Abstract

It is well-known that certain fluids are birefringent and when flows are viewed in polarised light interference fringes are observed. The fringes are caused by a phase shift in the light passing through the fluid and are proportional to the integral of the maximum shear strains in the fluid. In order to understand what is happening within the three dimensional flow and overcome the difficulties due to this integration, additional computational or experimental information is needed. In this work, a commercially available computer code (Fluent) is used for the first time to model the flows. The flow data are then exported to a spreadsheet where the shear rates are integrated across the field and then banded for graphical output. The results from this are then compared to results generated from birefringent flow experiments and the agreement is found to be good since the modelled fringes show the same patterns as those in the experiment. This novel use of computational and experimental techniques together will allow quantitative analysis of three-dimensional flows in the future. Currently, there are still a lot of empirical variables involved in fitting the computational fringes to the experiment, but the results of this preliminary study show that this is a promising approach to this type of problem.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2006 Elsevier Inc. This is an author produced version of a paper published in 'International Journal of Heat and Fluid Flow'. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Birefringent flows Computer modelling Experiments Shear rate Birefringence Computational fluid dynamics Computer simulation Light interference Light polarization Phase shift Computer code Shear strains Optical flows
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield)
Depositing User: Mr Christopher Hardwick
Date Deposited: 13 Aug 2009 10:45
Last Modified: 08 Feb 2013 16:58
Published Version: http://dx.doi.org/10.1016/j.ijheatfluidflow.2006.0...
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.ijheatfluidflow.2006.01.007
URI: http://eprints.whiterose.ac.uk/id/eprint/9117

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