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Whitepaper

Overcoming and Quantifying ‘Wall Slip’ in Measurements Made on a Rotational Rheometer

When making shear rheological measurements on structured liquids, in particular suspensions, emulsions or foams there is a high probability that the measurement may be affected by a phenomenon known as ‘wall slip’. Wall slip generally results from a local depletion of the dispersed phase near the geometry walls, effectively forming a lubrication layer at the surface.

As a consequence, bulk rheological properties are no longer being accurately measured leading to an underestimation of the true viscosity. A similar effect can be observed when measuring solid like materials where there is insufficient friction between the sample and the wall to support the applied stress.

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Overcoming and Quantifying ‘Wall Slip’ in Measurements Made on a Rotational Rheometer

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