Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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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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- Two spherical vessels of different sizes contain the same gas and are connected by means of a pipe with a valve. Sphere A has a diameter of 5 foot at the given pressure gauge of 50 kgf/cm2. Sphere B contains the same gas at 20 kgf/cm² gauge. The valve is opened and when the properties have been determined, it is found out that the gauge pressure is 36 kgf/cm2. The temperature at the two vessels before and after opening the valve is maintained at 21.1°C. If the barometric pressure is 750 torr and the gas inside the sphere is oxygen, find the following: The volume of sphere A is 113097.33 in3 The pressure of sphere A is 711.43 psia The temperature of sphere A is 529.98 R The pressure at sphere B in psia Temperature at sphere B in F The pressure of the gas when mixed in psia The temperature of the gas when mixed in K The atmospheric pressure in psi The diameter of Sphere B The total mass of the gas after opening the valvearrow_forwardA square high-density polyethylene [a = 158 × 10-6/°C] plate has a width of 295 mm. A 177 mm diameter circular hole is located at the center of the plate. If the temperature of the plate increases by 45°C, determine: (a) the change in width of the plate. (b) the change in diameter of the hole. Answer: (a) Aw= (b) Ad = i i mm mmarrow_forwardChoose the correct answer How can relatively denser object be made to float on the less dense fluid? * a-By altering the shear forces acting on the object b-By altering the shape. c-By altering the forces acting on the object d-None of the mentionedarrow_forward
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