Parallel-plate rheometer
= Parallel-plate rheometer
A <parallel-plate rheometer> shears a sample in a thin gap between coaxial disks. <Rotation> at angular speed $\Omega$ gives local <shear rate> $\dot\gamma(r)=\Omega r/h$, so differentiating the measured torque with respect to rim <shear rate> can recover a generalized-Newtonian <viscosity>.