Experimental study of the induced flow birefringence of a suspension of rigid particles at the transition from Couette flow to Taylor vortex flow |
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Authors: | J P Decruppe R Hocquart R Cressely |
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Institution: | (1) Laboratoire de Physique des Polymères, University de Metz, 57045 Metz Cedex, France |
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Abstract: | The flow birefringence induced in solutions of rigid particles is studied experimentally in the region of the axisymmetrical Taylor vortex flow which arises once the velocity gradient G in the annular gap of a conventional Couette cell reaches a critical value G
c
.The measurements are performed for several values of G > G
c
and for 10 radial observation points in the annular gap. Solutions of two types of rigid particles are investigated: the first is a suspension of flattened clay particles like bentonite, while the second contains rod-like particles of tobacco mosaic virus (TMV). The variations of the birefringence intensity n and of the extinction angle measured in the domain of the axisymmetrical flow show a different behavior according to the shape of the particle in solution. This fact is confirmed theoretically with a good agreement for the measurements performed with solutions of flat particles. |
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Keywords: | Flow birefringence Taylor flow suspension |
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