Direct Determination of the Flow Curves of Non-Newtonian Fluids. IV. Parallel-Plane Rotational Viscometer

Analysis of the laminar flow of a non-Newtonian fluid between rotating parallel planes permits the viscosity to be calculated as a function of shear rate from data of torque vs angular velocity. Experimental results are presented which show that the non-Newtonian viscosities thus obtained agree with capillary, Couette, and cone-and-plate instruments over a four-decade shear rate range.