Rijan Maharjan

Giant deviation of a relaxation time from generalized Newtonian theory in discontinuous shear thickening suspensions

We investigated the transient relaxation of a Discontinuous Shear Thickening suspension of cornstarch in water. We performed 2 types of relaxation experiments starting from a steady shear in a parallel plate rheometer, followed by either stopping the top plate rotation and measuring the transient torque relaxation, or removing the torque on the plate and measuring the transient tool rotation. We found that at low weight fraction

What Googling Trends Tell Us about Public Interest in Earthquakes

\phi_{eff}<58.8\pm0.4\%

Characterizing the formation and regeneration of hairpin vortices in a laminar boundary layer

, the suspensions exhibited a relaxation behavior consistent with a generalized Newtonian fluid. However, for larger weight fraction

System-spanning dynamically jammed region in response to impact of cornstarch and water suspensions

58.8\% < \phi_{eff} < 61.0\%

Constitutive relation for the system-spanning dynamically jammed region in response to impact of cornstarch and water suspensions

, near the liquid-solid transition

Structure of the system-spanning dynamically jammed region in response to impact of cornstarch and water suspensions

\phi_c=61.0\pm0.7\%

Anomalous divergence of a relaxation time in discontinuous shear thickening suspensions

, we found relaxation behaviors different from the generalized Newtonian model. The relaxation time in this range scales with the inverse of the critical shear rate at the onset of shear thickening. In this range the relaxation time was the same in both stress and rate controlled experiments, rather than the viscosity calculated from the relaxation time which is expected to be intrinsic material parameter in the generalized Newtonian model. The discrepancy between the measured relaxation times and the generalized Newtonian prediction was found to be up to

A new state transition in the rheology of dense suspensions

10^4

Hairpin Vortex Regeneration Threshold

, and extrapolations diverge in the limit of

A system-spanning dynamically jammed region in response to impact of cornstarch and water

\phi_c