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Klaus Wollny, Jörg Läuger, Siegfried Huck
Magneto Sweep - A Method for characterizing the Viscoelastic Properties of Magneto-Rheological Fluids

Appl. Rheol. 12:1 (2002) 25-31

The viscoelastic properties of a magneto-rheological fluid can be variably controlled using a magnetic field. A new measuring method is introduced which is based on oscillatory tests. In contrast to flow curves from experiments at steady shear rate, the new method allows an exact determination of a magneto-rheological fluid.s viscoelastic properties as a function of the preset magnetic field strength. The .Magneto Sweep. is an oscillatory test method, each with constant amplitude and constant frequency while logarithmically increasing the magnetic field strength (Magneto Sweep). For typical magneto-rheological fluids (MRF) three characteristic regions and two significant transition points can be determined. These transitions mark the corresponding change in material behavior resulting from an increasing magnetic field strength.

Cite this publication as follows:
Wollny K, Lä, uger J, Huck S: Magneto Sweep - A Method for characterizing the Viscoelastic Properties of Magneto-Rheological Fluids, Appl. Rheol. 12 (2002) 25.

K. Wollny
New Rheological Test Method to Determine the Dewatering Kinetics of Suspensions

Appl. Rheol. 11:4 (2001) 197-202

Rheology plays an important role in dewatering processes. It is therefore interesting to analyze the dewatering process and the rheological behavior of a suspension simultaneously. An exact determination of the immobilization point at the maximum of the loss factor as well as the immobilization time can be attained using an oscillatory time test with preset strain. The degree of dewatering is determined via normal force controlled gap setting. This report offers an insight into the theory of the dewatering of liquid supersaturated suspensions and shows how the kinetics of dewatering can be determined using paper coating as an example.

Cite this publication as follows:
Wollny K: New Rheological Test Method to Determine the Dewatering Kinetics of Suspensions, Appl. Rheol. 11 (2001) 197.


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