Question

Consider atmospheric air at 25oC and a velocity of 20 m/s flowing
over both surfaces of a 1-m-long flat plate that is maintained at
100oC. Determine the rate of heat transfer per unit width from the
plate for

5
values of the critical Reynolds number corresponding to 5x10
.

Answer #1

Determine the heat transfer rate per unit width for a 0.9-m long
plate with a surface temperature of 125°C for critical Reynolds
numbers corresponding to (A) 105,
(B) 5 x 105, and (C)
106. Air flows over the plate at 25°C with a velocity of
25m/s.
Calculate the Reynolds number.
Critical Reynolds Number A
Critical Reynolds Number B
Critical Reynolds Number C

Liquid water at velocity of 2 m/s and temperature of
15 °C flows over a flat plate. The plate has a width of 1 m, length
of 0.4 m and surface temperature of 37 °C.
Determine:
(a) the average heat transfer coefficient.
(b) the convection heat transfer rate from the top surfacc of the
platc.

Air at freestream velocity U∞=16
ms, and free steam temperature
T∞=50℃ is
flowing over a plate surface that is at temperature
Ts=100℃. The velocity and thermal
boundary layers developing on the surface have been shown in the
figure. Also shown are the tangents to the velocity and temperature
profiles at the surface y=0. If the density of air is
ρ∞=1.1
kgm3, viscosity
μ=1.963×10-5kgm∙s, and
thermal conductivity k=0.0274Wm∙K then,
calculate
(a) the wall shear
stress, τw
(b) coefficient of skin
friction,...

Dry air at 35°C and a velocity of 20 m/s flows over a wetted
plate of length 500 mm and width 150 mm. An embedded electrical
heater supplies power to maintain the plate surface temperature at
20°C. What is the evaporation rate (kg/h) of water from the plate?
What electrical power is required to maintain steady-state
conditions?
Determine the evaporation rate of water from the plate, in
kg/h
Determine the electrical power is required to maintain
steady-state conditions, in W

Problem 4: Air at 20°C and 1 atm flows over a horizontal flat
plate at 1 m/s. The plate is 20m by 1m and is maintained at 60°C.
If the flow is in the direction of smaller side, calculate the
power needed to maintain the surface temperature.
Also repeat problem 4 for a case where air velocity is zero.

Air at a pressure of 1 atm and a temperature of 15C is in
parallel flow at a velocity of 10
m/s over a 3-m long flat plate that is heated to a uniform
temperature of 140 C.
(a) What is the average heat transfer coefficient and heat transfer
rate for the plate?
(b) What is the local heat transfer coefficient and heat flux at
the midpoint of the plate?
(c) Plot the variation of the heat flux with distance...

Airflow (velocity of u∞=15m/s, the temperature of
T∞= 15°C) sweep over a flat surface with an area of 0.25
m2 and a temperature of 140 °C. The airflow induces a
drag force of 0.25 N on the surface. What is the heat transfer rate
across the surface? You can use Table A.4 in the lecture slides or
other available data to evaluate air properties (Hint: Use Modified
Reynolds analogy) (10 points)

10. Air is to be heated by passing
it over a bank of 2.8-m-long tubes inside which steam is condensing
at 90ºC. Air approaches the tube bank in the normal direction at
20ºC and 1 atm with a mean velocity of 5.2 m/s. The outer diameter
of the tubes is 1.6 cm, and the tubes are arranged staggered with
longitudinal and transverse pitches of SL = ST= 4 cm. There are 30
rows in the flow direction with 10 tubes...

This is a heat transfer course, please explain and show work
neatly, and please do not copy from any other solutions because
they are incorrect. Thank you so much in advance
Consider atmospheric air at a velocity of V = 20 m/s and a
temperature of T= 20C, in cross flow over 10 mm square tube at 45
degrees, maintained at 50C.
Sketch
Assumptions
Calculate the air properties (show the interpolation
steps)
Re = ?
Nu = ? (reference the...

1) A nozzle is a device for increasing the velocity of a
steadily flowing stream of fluid. At the inlet to a certain nozzle
the enthalpy of the fluid is 3025 kJ/kg and the velocity is 60 m/s.
At the exit from the nozzle the enthalpy is 2790 kJ/kg. The nozzle
is horizontal and there is negligible heat loss from
it.
(i) Find the velocity at the nozzle exit.
(ii) If the inlet area is 0.1 m2 and specific volume...

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