Date of Award
Master of Science
Chemical and Paper Engineering
Paper Engineering, Chemical Engineering and Imaging
Dr. James E. Kline
David K. Peterson
Masters Thesis-Open Access
When using a cup and bob viscometer, it has long been recognized that errors in the viscosity measurement can arise from several factors, among them slip. Slip is a phenomenon which occurs when there are slipping layers in the fluid under shear, causing a non-uniform velocity gradient to be generated across the gap of the cup and bob viscometer. A layer of fluid at either the bob or cup wall moves faster than the adjoining layers, causing the slipping effect. This leads to a low viscosity calculation for the fluid.
In this study, experiments with coating formulations were conducted using the Hercules high shear viscometer to measure slip. The Hercules viscometer could measure a slip velocity for different formulations, however, negative slip values were generated. It was concluded that these values were the result of the generation of a negative velocity gradient caused by a bob-driven viscometer.
Krieger, Daniel Parker, "The Slip Velocity of Coating Formulations Using the High-Shear Viscometer" (1993). Masters Theses. 4912.