Sustainable Energy
1st Edition
ISBN: 9781133108689
Author: Richard A. Dunlap
Publisher: Cengage Learning
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In the figure below, a pool of liquid sodium is sitting in open atmosphere (and somehow not
exploding from the moisture in the air) and an absolute pressure measurement device.
The measurement device reads an absolute pressure of P2 at the depth of L in the pool.
a) If P2 is 5bar and assume the density of liquid sodium has a temperature just
above the melting point for sodium, plot the pressure distribution from the P2 and
P1 using Excel.
Figure 1: A 2-D pool of Sodium on Earth that magically is keeping all of it's liquid
inside even though it has no front and back sides.
2. The cylinder shown in figure 2 is made from a uniform material. What is its specific
weight?
Kerosene at 25°C(SG=0.823)
750 mmi
600 mm
400 mm
Figure 2
An aluminum cylinder (s.g=2.7) 15 cm high and with diameter d=8.1 cm slides down inside a tube with inner
diameter D=8.2 cm, as shown in the figure. The cylinder is concentric with the axis of a tube and between
them there is a thin film of oil of s.g. =0.8 with a kinematic viscosity of 0.075St.
a) What is the (constant) rate of fall of the cylinder inside the tube?
b) determine the torque needed to keep the inner cylinder rotating at an angular speed w=200rpm
D
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