Cone-and-plate rheometer
= Cone-and-plate rheometer
{title2=$\dot\gamma=\Omega/\alpha,\quad T=2\pi a^3\sigma_{\phi z}/3$}
= Cone-and-plate viscometer
{synonym}
A small-angle cone rotating above a stationary plate imposes approximately uniform <shear rate>, since local gap and wall speed both scale with radius. Integrating the uniform shear stress with moment arm r over the plate gives the displayed torque. The leading approximation neglects edge effects and inertia.