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Answer the following statement true (T) or false (F)
False
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Experimental measurements of the temperature distribution during the flow of air at atmospheric pressure over the wing of an airplane indicate that the temperature distribution near the surface can be approximated by a linear equation
where a = a constant = 2 m–1
Ts = surface temperature, K
T? = free stream temperature, K
y = perpendicular distance from surface (mm)
(a) Estimate the convective heat transfer coefficient if
Ts = 50°C and T?= – 50°C.
(b) Calculate the heat flux in W/m2
GIVEN
Air flow over an airplane wing
Temperature distribution is given by the expression above
Surface temperature (Ts) = 50°C
Ambient temperature (T?) = – 50°C
FIND
(a) The convective heat transfer coefficient
ch
(b) The heat flux (q/A) in W/m2
ASSUMPTIONS
Steady state conditions
Uniform surface temperature
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 28, for air at 0°C, the thermal conductivity (k) = 0.0237 W/(m K)
The force that accelerates a rocket in outer space is exerted on the rocket by the
A) rocket's engine. B) rocket's wings. C) atmospheric pressure. D) exhaust gases. E) none of the above
In a parallel circuit with three resistors all the same size, the current flow though each leg of the circuit will be equal
a. True b. False Indicate whether the statement is true or false
A hoop (I = MR2) is rolling along the ground at 10 m/s. It comes to a hill and starts going up. Assuming no losses to friction, how far does it travel vertically up the hill before it stops?
a. 10 m c. 5.1 m b. 3.7 m d. 7.7 m