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Viscosity of Newtonian and non-Newtonian liquids (rotary viscometer)

Viscosity of Newtonian and non-Newtonian liquids (rotary viscometer)

Item no.: P2140300

Experiment Type: Teacher Experiment, Laboratory Experiment

Difficulty Expenditure of Time print
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Principle

The viscosity of liquids can be determined with a rotation viscometer, in which a motor with variable rotation speed drives a cylinder immersed in the liquid to be investigated with a spiral spring. The viscosity of the liquid generates a moment of rotation at the cylinder which can be measured with the aid of the torsion of the spiral spring and read on a scale.

Benefits

  • Classic experiment to determine the viscosity of a huge variety of fluids
  • Watch all results directly on the built-in multilanguage display
  • Use several spindles that come with a storage rack
  • Wearless torque measuring system with high accuracy
  • Digital speed control
  • Interdisciplinary use also in applied sciences or physical chemistry

Tasks

  1. Determine the gradient of the rotational velocity as a function of the torsional shearing stress for two Newtonian liquids (glycerine, liquid paraffin).
  2. Investigate the temperature dependence of the viscosity of Castor oil and glycerine.
  3. Determine the flow curve for a non Newtonian liquid (chocolate).

What you can learn about

  • Shear stress
  • Velocity gradient
  • Internal friction
  • Viscosity
  • Plasticity
Document     Filesize
p2140300e.pdf Experiment guide, English 393.09 KB

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