Normal Stress Differences and Yield Stresses in Attractive Particle Networks

Figure 10

Comparison between the steady-state solutions of the viscoplastic (VP) Herschel–Bulkley model and the elastoviscoplastic (EVP) Saramito model in cylindrical Couette geometry with different residual stresses: (a) velocity, with experimental data (exp.) for a natural bentonite suspension (from [136]); (b) normal stress; (c) shear stress. Lines: solutions of the EVP model with different initial stress conditions. Thick solid line (EVP⁰): ; thin dashed line (EVP⁺): ; thin dotted line (): ; thick dash-dotted line (VP). represents the critical radius for flow. (Reprinted with permission from Cheddadi et al. [92]. Copyright 2012, The Society of Rheology.)

(a)

(b)

(c)