A Practical Approach to Rheology and Rheometry by Gebhard Schramm

By Gebhard Schramm

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698 rad (4°) are often used for dispersions with larger sized fillers. e. the shear rate gS is constant from the cone tip to the outer radius Rc Constant gS can also be assumed for any point within the gap. Setting the cone so that it’s tip just touches the plate is very critical especially when using cones with small cone angles. 5 mm and a cone angle of 1 degree only 15 microns too high this will cause a 5 % error in the viscosity measurement! Rc = α = RT = a = Outer radius of cone Cone angle Truncation radius Height of removed tip ÉÉÉÉÉ ÉÉÉÉÉ ÇÇÇÇÇ ÇÇÇÇÇ a Rc test sample ÇÇÇÇÇÇÇÇÇÇÇÇÇ ÉÉÉÉÉÉÉÉÉÉÉÉ ÉÉÉÉÉÉÉÉÉÉÉÉ α a RT Fig.

Problems with slippage often arise with fats and greases. 4 Samples must be homogeneous This requirement means that the sample must react to shear uniformly throughout. e. they have to be homogenously distributed. 31 Rheology In rheometry really homogeneous samples are rare. If dispersions are considered homogeneous because every small volume element contains an identical share of all the ingredients, then problems can still occur when the increasing shear encountered during the measurement leads to phase separation.

The twist angle of the torque spring is a direct measure of the viscosity of the sample. 5° – rigid springs – are more common in viscometers. “Searle” again means that both the drive on the rotor and the torque detector act on the same rotor axis. An easy variation of the geometry of the sensor systems – coaxial cylinder, cone-and-plate and parallel-plate sensor systems – allows a versatile usage of this type of rheometer for the measurement of fluids of either medium or very high viscosity. Searle type in comparison to Couette rheometers run into more problems with low viscosity liquids at high shear rates since under those conditions the laminar flow may cause turbulence resulting in erroneous results.

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