Rheoceptor™ Disk Viscometer

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Rheoceptor Disk Viscometer

The disk type Rheoceptor™ viscometer has a disk that rotates inside a vessel with a pressure transducer flush-mounted on its inside wall. The vessel may be a reactor kettle of a transfer line. An external motor rotates the disk, and the disk is shaped such that the clearance between it and the vessel wall varies with angle. The pressure transducer is located behind the rotating disk, and when the narrow-clearance part of the disk passes the pressure transducer, a pressure pulse is recorded. The amplitude of the pulse is proportional to the viscosity of the liquid, consistent with lubrication theory. The shear rate of the measurement is a design parameter given by the ratio of the tangential speed of the cam divided by the average gap between the cam and the wall. Since the motor speed can be varied, this type viscometer measures over a continues range of shear rates.

A disk viscometer for measurements in a reactor vessel. The disk fits next to the wall inside the reactor vessel. A drive shaft extends from the disk through the vessel wall to an external motor. A pressure transducer is flush-mounted in the wall of the vessel. The lobes of the rotating disk pass by the pressure transducer and generate the pressure profiles. For continuous shear rate sweeps, external variable speed drive motors can be used with side stream and reactor vessel versions.