Universal rescaling of flow curves for yield-stress fluids close to jamming.
The experimental flow curves of four different yield-stress fluids with different interparticle interactions are studied near the jamming concentration. By appropriate scaling with the distance to jamming all rheology data can be collapsed onto master curves below and above jamming that meet in the shear-thinning regime and satisfy the Herschel-Bulkley and Cross equations, respectively. In spite of differing interactions in the different systems, master curves characterized by universal scaling exponents are found for the four systems. A two-state microscopic theory of heterogeneous dynamics is presented to rationalize the observed transition from Herschel-Bulkley to Cross behavior and to connect the rheological exponents to microscopic exponents for the divergence of the length and time scales of the heterogeneous dynamics. The experimental data and the microscopic theory are compared with much of the available literature data for yield-stress systems.
Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1018 XH Amsterdam, The Netherlands.
M
M
Dinkgreve
Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1018 XH Amsterdam, The Netherlands.
J
J
Paredes
Theory of Polymers and Soft Matter, Department of Applied Physics, Eindhoven University of Technology, P. O. Box 513, 5600 MB Eindhoven, The Netherlands.
M A J
MA
Michels
Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1018 XH Amsterdam, The Netherlands.
D
D
Bonn