Technical data

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

Article no: P2140300

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> Unknown 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

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

Learning objectives

Shear stress
Velocity gradient
Internal friction
Viscosity
Plasticity

Scope of delivery

Rotational viscometer	18224-99	1
Right angle boss-head clamp	37697-00	2
Supp.rod stainl.st.,50cm,M10-thr.	02022-20	1
Spring balance holder	03065-20	1
Support rod with hole, stainless steel, 10 cm	02036-01	1
Magnetic stirring bar 30 mm, cylindrical	46299-02	1
Separator for magnetic bars	35680-03	1
Beakers, Boro, low form, various sizes	46056-00	1
Beakers, Boro, high form, various sizes	46027-00	1
Glass rod, boro 3.3, l=200mm, d=5mm	40485-03	1
Glycerol, 250 ml	30084-25	2
Liquid paraffin, thick, 250 ml	30180-25	1
Castor oil 250 ml	31799-27	2
Acetone, chemical pure, 250 ml	30004-25	3