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A frustum-shaped body is rotating at a constant angular
Chapter 2, Problem 73P(choose chapter or problem)
Problem 73P
A frustum-shaped body is rotating at a constant angular speed of 200 rad/s in a container filled with SAE 10W oil at 20°C (μ = 0.1 Pa • s), as shown in Fig. P9-31. If the thickness of the oil film on all sides is 1.2 mm, determine the power required to maintain this motion. Also the determine reduction in the required power input when the oil the reduction in the required power input when the oil temperature rises to 80°C(μ = 0.0078 Pa • s)
Questions & Answers
QUESTION:
Problem 73P
A frustum-shaped body is rotating at a constant angular speed of 200 rad/s in a container filled with SAE 10W oil at 20°C (μ = 0.1 Pa • s), as shown in Fig. P9-31. If the thickness of the oil film on all sides is 1.2 mm, determine the power required to maintain this motion. Also the determine reduction in the required power input when the oil the reduction in the required power input when the oil temperature rises to 80°C(μ = 0.0078 Pa • s)
ANSWER:
Problem 73P
Solution 73 P
Step 1 :
In this question, we need to find power needed to maintain the motion
In the second part, we need to find reduction in input power required when the temperature rises
Data given
At Temperature ,Viscosity
Thickness of wall
At Temperature ,Viscosity
Consider the given figure