A dynamic jamming point for shear thickening suspensions
arXiv:0904.0671 · doi:10.1103/PhysRevLett.103.086001
Abstract
We report on rheometry measurements to characterize critical behavior in two model shear thickening suspensions: cornstarch in water and glass spheres in oil. The slope of the shear thickening part of the viscosity curve is found to increase dramatically with packing fraction and diverge at a critical packing fraction phi_c. The magnitude of the viscosity and the yield stress are also found to have scalings that diverge at phi_c. We observe shear thickening as long as the yield stress is less than the stress at the viscosity maximum. Above this point the suspensions transition to purely shear thinning. Based on these data we present a dynamic jamming phase diagram for suspensions and show that a limiting case of shear thickening corresponds to a jammed state.
4 pages, 3 figures. submitted to Phys. Rev. Lett
References in corpus (4)
Cited by in corpus (76)
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