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The viscosity of a fluid is to be measured by a viscometer
Chapter 2, Problem 78P(choose chapter or problem)
Problem 78P
The viscosity of a fluid is to be measured by a viscometer constructed of two 75-cm-long concentric cylinders. The outer diameter of the inner cylinder is 15 cm, and the gap between the two cylinders is 1 mm. The inner cylinder is rotated at 300 rpm, and the torque is measured to be 0.8 . N ∙ m. Determine the viscosity of the fluid.
FIGURE P2-83
Questions & Answers
QUESTION:
Problem 78P
The viscosity of a fluid is to be measured by a viscometer constructed of two 75-cm-long concentric cylinders. The outer diameter of the inner cylinder is 15 cm, and the gap between the two cylinders is 1 mm. The inner cylinder is rotated at 300 rpm, and the torque is measured to be 0.8 . N ∙ m. Determine the viscosity of the fluid.
FIGURE P2-83
ANSWER:
Solution 78P
The viscosity of a fluid is to be measured by a viscometer constructed of two 75-cm-long concentric cylinders. The outer diameter of the inner cylinder is 15 cm, and the gap between the two cylinders is 1 mm. The inner cylinder is rotated at 300 rpm, and the torque is measured to be 0.8 N.
Step 1 of 2
The torque measured is given by the expression
=
(
)
Where, Torque measured ,
viscosity,
= radius of the inner cylinder,
number of revolutions per minute,
= length of the cylinder ,
= thickness of the layer.