Vane rheometry

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Figure 1.

Vane rheometry refers to measuring rheological parameters of a liquid or dispersion using a rotating vane immersed in the substance. The torque required to rotate the vane is measured as a function of the shear strain, and from this data, the viscosity and other properties can be extracted. Originally, the vane geometry was used to measure the yield stresses of inorganic dispersions, but recently has been used to measure several other rheological properties including the low-strain modulus and the steady-state flow-curves of substances. In addition to simple fabrication and ease of cleaning, the main advantage of the vane geometry is the elimination of wall-slip effects. A typical vane-and-basket geometry is shown in the figure.