Water at a temperature of 80 °C and velocity of 1.2 m/s is
flowing parallel to one side of a smooth flat plate. The plate is
maintained at a constant temperature of 24 °C and is 0.8 m long and
0.5 m wide. Determine the following:
The heat flux at a distance x = 0.6m from the front edge of the
plate, q” = ____________
The location of the maximum heat flux on the plate, x =
_________
The total...
Water flowing along a horizontal pipe has a speed of 2.31 m/s
and a pressure of 4.25 atm. Further along, the pipe narrows so that
the cross-sectional area decreases by a factor of 6.17. What is the
pressure in the narrow section?
Water flowing at a rate of 0.03 kg/s is heated from 20 to 40°C
in a horizontal pipe (inside diameter = 3 cm). The inside pipe
surface temperature is 70°C. Estimate the convective heat transfer
coefficient if the pipe is 1 m long. Assume forced convection
conditions. Ts is not held constant!
Properties of Water
20°C
30°C
40°C
ρ (kg/m3)
998.2
995.7
992.2
k (W/mK)
0.597
0.615
0.633
μ (Pa s)
993.414 x 10-6
792.377 x 10-6
658.026 x 10-6
Cp...
Develop the formula for friction factor ‘f’. Keeping in mind the
Re# should always be in turbulent region. What value of D should be
selected to get turbulent flow. Start the value from 0.01m try to
find the value of D to have the turbulent flow. Use Excel Solver
tool and demonstrate how it can be used to calculate friction
factor ‘f’ for a given Re# and relative roughness ?. The friction
factor is desired for water flowing at 0.063...
Air at 40 degrees C is humidified by flowing over a 1-m-long
container filled with water. The surface area of container is
0.5m^2.The interfacial temperature is 20 degrees C. If the initial
humidity of the air is 0% and its velocity is 0.5 m/s, calculate
the mass flow rate of vapor evaporated.
A projectile is launched straight up at 55.5 m/s from a height
of 71 m, at the edge of a sheer cliff. The projectile falls just
missing the cliff and hitting the ground below. (a) Find the
maximum height of the projectile above the point of firing. m (b)
Find the time it takes to hit the ground at the base of the cliff.
s (c) Find its velocity at impact. m/s
Air is flowing in a 1.5 m2 wind tunnel at 200 m/s at
a pressure of 250kPa, and temperature of 20°C at the entrance.
Calculate:
(i) Mach number
(ii) Total Temperature
(iii) Total Pressure
(iv) Mass flow rate of air.
1.) Saturated liquid water flowing at 3kg/s is initialy at 30
bar.
a.) this steam is throttled through a valve to 9 bar. What is
the vapor fraction of the steam after the valve?
b.) afterwards, 6.0 MW is added to the steam. What is the final
temperature of the steam?
What is the entropy change for this heating, in kW/K?
Water at a mean temperature of 80 °C and a mean velocity of 0.15
m/s flows inside a 2.5 cm ID and 3.3 cm OD, copper tube.
Atmospheric air at 20 °C and a velocity of 10 m/s flows across the
tube. Calculate the overall heat transfer coefficient based on the
outer surface and the rate of heat loss per 1 m length of the tube
for inside and outside fouling factor 0.00018 m2. What is the
percent reduction in...
Fluid X is flowing in a circular pipe with a constant velocity ν
(m/s). The fluid is cooled by a jacket kept at constant
temperature, Tj. Fluid velocity is plug shaped , in other words
uniform at radial positions. Assume that temperature is uniform in
radial positions because of turbulent flow conditions; ρ and Cp of
the fluid are constants. The inlet temperature (at z=0) is constant
and uniform at To (To>Tj). Assume that thermal conduction of
heat along the...