A constant stress, parallel plate viscometer without bearing for very low shear stresses

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Abstract
A simple, constant stress viscometer without bearing is described. The rotating part consists of a ferromagnetic disc which floats on the liquid. It is driven and centred by a fast rotating magnetic field. The shear stress can be varied continuously between 5*10-5 and 0.5 Pa by changing the distance between the disc and the rotating magnet.

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