Reni Devienne, Philippe Corvisier, Abdel Lyazid
Flow of Some Carboxymethylcellulose Solutions Through Abrupt Axisymmetric Contractions.Experimental Study and Modelling of Shear Thinning and Elongational Effects
Appl. Rheol. 13:2 (2003) 70-78Abstract: The focus of this paper will be on the modelling and simulation of contraction flow, with marked aspect ratio b = 6, 9, 12. Two fluid families are considered: a glycerol Newtonian solution and carboxy-methyl-cellulose (CMC) solutions which present particular rheological properties. Their shear thinning character are modelled by a Cross formula over a large scale of shear rates. The elongational properties are taken via a simplified Ericksen model into account. Experimental velocity profiles are determined using the Laser Doppler Anemometry (L.D.A) technique. They are found to be in good agreement with numerical velocity profiles obtained using a finite volume method with extra source terms traducing the particular rheological behaviour proposed here. The simulations allow to determine the different values of an elongational parameter m3. Then, some numerical results concerning the total energy losses are presented using the usual concept of the equivalent length. © 2003 Applied Rheology.
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