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

Product No: P2140300

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.

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).

What you can learn about

Shear stress
Velocity gradient
Internal friction
Viscosity
Plasticity

Materiallist (Excerpt)	Product	Amount
Rotary viscometer, 15 - 2,000,000 mPas, 110...240 V	18223-99	1
Magnetic stirrer MR Hei-Standard	35750-93	1
Electronic temperature controller EKT Hei-Con	35750-01	1
Glycerol 250 ml	30084-25	2
Castor oil 250 ml	31799-27	2
Liquid paraffin 250 ml	30180-25	1
Acetone, chem.pure 250 ml	30004-25	3
Supp.rod stainl.st.,50cm,M10-thr.	02022-20	1
Separator f.magnetic bars	35680-03	1
Spring balance holder	03065-20	1
Support rod with hole, stainless steel, 10 cm	02036-01	1
Right angle clamp	37697-00	1
Glass beaker DURAN®, short form, 600 ml	36015-00	3
Glass beaker DURAN®, tall, 250 ml	36004-00	2
Magnetic stirring bar 30 mm, cylindrical	46299-02	1
Glass rod,boro 3.3,l=200mm, d=5mm	40485-03	1
Laboratory Experiments Physics, Chemistry, Biology andApplied Sciences, CD-ROM, incl. operating manuals	16502-42	1