MIXER VISCOMETER CONSTANT (k) FOR THE BROOKFIELD SMALL SAMPLE ADAPTER AND FLAG IMPELLER

Abstract

ABSTRACT The mixer viscometer constant (k 1 ) of a Brookfield viscometer equipped with a flag impeller and small sample adapter was determined using the slope and matching viscosity methods. Results showed that k’ was equal to a constant value of 2.92 rad −1 using the slope method and found to be a function of angular velocity (Ω), k’= 2.54(Ω) −0.176 , using the matching viscosity method. An example problem illustrating how the mixer viscometry principle can be used to determine the relationship between apparent viscosity and average shear rate is presented.