Hoppler viscosimeter

Die Viscositatsmessungen (111) wurden im HoppLER-Viscosimeter, die Berechnungen nach der Formel... 

A special form of the falling sphere viscosimeter is the Hoppler viscosimeter (Fig. 3.11), which works with a sphere with a diameter very close to the diameter of the sloped tube. 

The determination of the viscosity with this device is done according to DIN 53015. The relative flow around the sphere is similar to the flow through a gap. In the Hoppler viscosimeter, the slope of the falling tube is 10° and its diameter is 16 mm. In this case, a sphere with a diameter of approx. 15 mm is used to achieve a sliding state. Evaluation of the state of flow is very difficult and in some cases impossible. For this reason, a calibration of the device with a calibration fluid is very important. With these calibration measurements, a constant K can be obtained ... 

If F is unknown, the sphere factor has to be determined as described for the Hoppler viscosimeter via calibration measurements. An exact evaluation of the state of flow is not possible. When a doubling of the traction does not lead to half the measuring time, it is very likely that the sample shows a non-Newtonian flow behavior, since the product of force and time should be constant for a Newtonian fluid. Advantages of the viscobalance are the great measuring range and the possibility to examine nontransparent and high viscous fluids of unknown density. 

Hydroxyethyl starch Hydroxyethylsulfoethyl cellulose International Organization for Standardization International Union of Pure and Applied Chemistry Constant, constant of the capillary viscosimeter, constant of the Hoppler viscosimeter, Fikentscher constant Known capillary constant Fuoss constant... 

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