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Article Dans Une Revue Journal of Non-Newtonian Fluid Mechanics Année : 2002

Non-Newtonian effects on ribbing instability threshold

Résumé

Threshold of ribbing in a two-roll setup is investigated for non-Newtonian fluids. Two typical shear-thinning polymeric solutions are used, the first one exhibiting inelastic properties (Xanthan), the second one viscoelastic properties (polyacrylamide, PAAm). The effect of polymeric concentration and thus rheological parameters on the effective critical capillary number Ca∗ at the onset of ribbing is described. For low polymer concentrations, only a small decrease of the onset is observed for both fluids. At larger concentrations, Ca∗ remains constant for inelastic fluids, while for the elastic fluids, a continuous decrease up to a factor 10, with respect to the Newtonian case, is observed. Above threshold, a strong effect on elastic properties is also observed on the amplitude of ribbing.

Dates et versions

hal-04401194 , version 1 (17-01-2024)

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F. Varela López, Ludovic Pauchard, M. Rosen, Marc Rabaud. Non-Newtonian effects on ribbing instability threshold. Journal of Non-Newtonian Fluid Mechanics, 2002, 103 (2-3), pp.123-139. ⟨10.1016/S0377-0257(01)00165-3⟩. ⟨hal-04401194⟩
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