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DGG

This document reviews key fluid properties including: - Density, specific weight, specific volume, and specific gravity are calculated for oil and petroleum products. - Temperature and pressure relationships are examined for ideal gases and vacuum/pressure conversions. - Surface tension and capillarity are explored through problems involving lifting rings and bubble pressures. - Compressibility calculations look at water volume changes with pressure increases. - Viscosity questions cover force calculations and conversions between poise, absolute and kinematic viscosity.

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Ken Ramos
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734 views1 page

DGG

This document reviews key fluid properties including: - Density, specific weight, specific volume, and specific gravity are calculated for oil and petroleum products. - Temperature and pressure relationships are examined for ideal gases and vacuum/pressure conversions. - Surface tension and capillarity are explored through problems involving lifting rings and bubble pressures. - Compressibility calculations look at water volume changes with pressure increases. - Viscosity questions cover force calculations and conversions between poise, absolute and kinematic viscosity.

Uploaded by

Ken Ramos
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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FLUID MACHINERY L2

REVIEW OF FLUID PROPERTIES

DENSITY, SPECIFIC WEIGHT, SPECIFIC VOLUME, SPECIFIC GRAVITY

1. If 5.0 m3 of oil weighs 3,900 kgf, calculate its specific weight, density, specific volume and specific gravity?
Use kilo-Newtons for force, kilograms for mass and cubic meters for volume. Answer: 7.7 kN/m3, 780 kg/m3,
1.3x10-3 m3/kg, 0.78

2. Calculate the density, specific weight and weight of one liter of petroleum product of specific gravity
0.700. Answer: 700. kg/m3, 6870 N/m3, 6.87 N

TEMPERATURE, PRESSURE

3. An ideal gas has its pressure doubled and its specific volume decrease by
two-thirds. If the initial temperature is 80 deg.F, what is the final
temperature? Answer: -100 deg.F

4. A vacuum of 25 kPa is measured at a location where the barometer


measures 70.7 kPa. What is the absolute pressure in millimeters of mercury,
feet water, atmosphere and torr? Answer: 343 mm Hg, 15.30 ft H2O, 0.451
atm, 343 torr.

5. Solve for the gage pressure at point A. Express answer in psig. Answer: 13.0 psig

SURFACE TENSION & CAPILLARITY

6. What force is required to lift a thin wire ring 6 cm in diameter from a water surface at 20 deg.C? Use
surface tension equal to 0.0728 N/m. Answer: 0.0274N

7. A machine creates small 0.5-mm-diameter bubbles of 20 deg.C


water. Estimate the pressure that exists inside the bubbles. At 20
deg.C, surface tension of water is 0.0736 N/m. Answer: 589 Pa

8. A glass tube is inserter in mercury, as shown; the common


temperature is 20 deg.C. What is the upward force on the glass as
a result of surface effects? (Use: surface tension = 0.514 N/m)
Answer: 0.0623N

COMPRESSIBILITY

9. Determine the percentage change in the volume of water if its pressure is increased by 30,000 psi. Use
bulk modulus of elasticity equal to 300,000 psi. Find the new specific volume at this condition if initial
density is 998 kg/m3. Answer: -10% or 10% decrease, 9.018x10-4 m3/kg

10. An unknown initial volume of water is compressed to 5000 psig resulting to final volume of 4.630 cubic
feet. What is the volume decrease and the initial volume if the temperature is 60 deg.F? Assume average
bulk modulus of elasticity of 2.34 GPa. Answer: 1.47% decrease, 4.70 ft3

VISCOSITY

11. Mercury at 20 deg.C has a viscosity of 1.58x10-2 Poise. What is the force necessary to maintain a relative
velocity of 2 m/s between two plates that are separated by 10 cm and whose area is 0.10 m2?
Answer: 3.16x10-3 N

12. If the viscosity of water at 68 deg.F is 0.01008 poise, compute its absolute viscosity in pound-seconds per
square foot. If the specific gravity at 68 deg.F is 0.998, compute its kinematic viscosity in square feet per
second. Answer: Answer: 2.11x10-5 lb-s/ft2 ; 1.09x10-5 ft2/s

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