SPRING 2014 – 07.03.2014
GMU 252 – FLUID MECHANICS
PROBLEM SET 1
(Problems 1, 2, and 4 are due Friday 14.03.2014)
1. a) Express 76 mm Hg pressure in atm ve Pascal.
b) Express the absolute pressure of 60 kPa as gage pressure.
2. Pressure gage above the below tank reads 34.5 kPa. Determine the height of the water
column (h), gage pressure acting on the bottom of the tank, and absolute pressure of the
air inside the tank. (Atmospheric pressure is 101.325 kPa)
34.5 kPa
Air
h
61 cm
Water
61 cm
3. A U-tube manometer is connected to a closed tank as shown in the following figure. Air
pressure inside the tank is 3.45 kPa, and specific weight of the oil is 8.5 kN/m³. If the
pressure at point A is 13.8 kPa, determine the depth of oil (z) and the differential reading
(h) on the manometer.
Air
z
Oil
h
A
61 cm
SG = 3.05
4. The inverted U-tube manometer shown below contains oil (SG = 0.9) and water. If the
pressure difference between pipes A and B (PA-PB) is -5 kPa, determine the differential
reading, h.
5. A mercury manometer is used to measure the pressure difference between pipes A and
B. Oil (specific weight = 8.33 kN/m³) is flowing in pipe A and mineral oil (specific weight =
8.96 kN/m³) is flowing in pipe B. An air pocket is entrapped in the mineral oil as shown.
Determine the pressure in pipe B if the pressure in pipe A is 105.5 kPa.