Annular pumping geometry

A sinusoidally driven vibrator described by Philippoff also belongs in this category, although under most circumstances its inertia and elastance can be neglected. It employs annular pumping geometry for liquid samples, and other geometries for different kinds of viscoelastic materials which will be mentioned... 

With a suitable mechanical drive, small angular oscillating deformations can be imposed on steady rotation at various shear rates, using either coaxial cylinder or cone and plate geometry, and the dynamic mechanical properties can be measured under conditions of non-Newtonian flow. By use of annular pumping geometry with steady rotation of the outer cylinder, the viscoelastic properties under conditions of non-Newtonian flow perpendicular to the oscillatory motion can be measured. ... 

FIG. 5-1. Geometries, coordinates, and dimensions for investigations of viscoelastic liquids, (a) parallel plate simple shear (b) annular pumping (c) rotation between coaxial cylinders (d) torsion between cone and plate (e) torsion between parallel plates (/) axial motion between coaxial cylinders. 

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