AWS rotational viscometry of polysaccharide solutions using a novel KK sensor

AWS Viscometry—Principles and Applications

“…Two 4-parameter models of analogous structure have been suggested [8,9] to fit both the fluidity and slip material functions: It frequently happens that the interval of shear stress is rather narrow and the both material functions can be well approximated by the localized power-law models. The corresponding local fluidity and slip models can be related to more complicated broad-range models using their logarithmic derivatives:…”

“…In particular, even for a homogenous liquid with no slip behavior, the primary data can manifest some virtual dependence on h because of a wrong calibration, as well as untreated or mistreated edge and inertia effects. A special statistical treatment, so called local filtering, was developed [9] to take account for the parametric sensitivity of -with respect to the material functions {M, F} and to distinguish it from the experimental artefacts. can be now displayed in the form, related to Eq.…”

“…The complete theory of a rotational viscometric flow with neglected (or compensated) centrifugal and elastic effects is still based on the concept of viscometric flows [9,10]. It is governed exclusively by the viscometric material functions, and includes an analysis of the edge effect in a neighborhood of the close-clearance part (a gap) of the sensor.…”

“…Selected data on c L for the power-law viscometric material functions have been published [9,10] in the form…”

“…Only two kinds of viscometric configurations make it possible to vary h in a single sensor without an additional mechanical manipulating the tested sample -the axial shift operating rotational viscometers with the disk-disk (DD) [6,7] or Morse cone-cone (KK) [8][9][10] sensors. Also a series of spindles immersed in turn to an unchanged large batch, e.g.…”