Assumptions 1 All the liquids are incompressible. 2 Pressure in the brine pipe remains constant. 3 The
variation of pressure in the trapped air space is negligible.
Properties The specific gravities are given to be 13.56 for mercury and 1.1 for brine. We
Assumptions
1 Oxygen is an ideal gas since it is at a high temperature and low pressure relative to its critical point
values of 154.8 K and 5.08 MPa. 2 The kinetic and potential energy changes are negligible, ke
pe 0
. 3 Constant specific heats at room t
Analysis (a) The saturation temperature of steam at 3.5 MPa is
Tsat@3.5 MPa = 242.6 C (Table A-5)
Then, the initial temperature becomes
T1 = 242.6+5 = 247.6 C
Also,
P
1
3.5 MPa
T1
247.6 C
h1
2821.1 kJ/kg
(Table A-6)
(b) The properties of steam when the pi
Assumptions
1 The tank is stationary and thus the kinetic and potential energy changes are zero. 2 The device is wellinsulated and thus heat transfer is negligible. 3 The energy stored in the resistance wires, and the heat
transferred to the tank itself i
Assumptions The variation of air density with altitude is negligible.
Properties The density of air is given to be = 1.18 kg/m3. The density
of mercury is 13,600 kg/m3.
Analysis Atmospheric pressures at the top and at the bottom of the
building are
Ptop
(
Properties The density of water is given to be
= 1000 kg/m3.
Analysis The pressure at the bottom of the tube can be expressed as
P
Patm
( g h) tube
Solving for h,
h
h
Patm= 92 kPa
P Patm
g
(115 92) kPa
1 kg m/s 2
1000 N/m 2
(1000 kg/m 3 )(9.81 m/s 2 )
1N
2 63 Fresh and seawater flowing in parallel horizontal pipelines are connected to each other by a double
U tube manometer. The pressure difference between the two pipelines is to be determined.
Assumptions All the liquids are incompressible.
Oil
Propertie
Analysis (a) The specific volume of the refrigerant is
0.5 m3
10 kg
V
m
At -20C,
0.05 m3 /kg
0.0007362 m3/kg and
f
saturated liquid-vapor mixture since
f
f
0.14729 m3/kg (Table A-11). Thus the tank contains
g
, and the pressure must be the saturation pres
University of Windsor
Mechanical & Materials Engineering Program
85-233: FLUID MECHANICS
April 15,1999, 12:00 NOON FINAL EXAMINATION
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NOTE: (1) This test has SEVEN problems. Please solve the problems on the test paper.