In geology, a crystal of a particular chemical composition or structure is referred to as a
A) rock
B) fossil
C) mineral
D) stone
C
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A stainless steel pin fin 5-cm-long, 6-mm-OD, extends from a flat plate into a 175 m/s air stream as shown in the sketch. Estimate (a) the average heat transfer coefficient between air and the fin. (b) the temperature at the end of the fin. (c) the rate of heat flow from the fin.
GIVEN
• A stainless steel pin fin in an air stream
• Pin length (L) = 5 cm = 0.05 m
• Pin diameter (D) = 6 mm = 0.006 m
• Air velocity (U?) = 175 m/s FIND
(a) The average heat transfer coefficient ( h c) (b) The temperature of the end of the fin (TL) (c) The rate of heat flow from the fin (qf)
ASSUMPTIONS
• Steady state
• Air approaching the fin has negligible turbulence
• Radiative heat transfer is negligible
• Steel is type 304
• Steel properties are uniform
PROPERTIES AND CONSTANTS
Thermal conductivity (k) = 0.0202 W/(m K) Kinematic viscosity (?) = 9.3 × 10–6 m2/s Prandtl number (Pr) = 0.71 From Appendix 2, Table 10, for Type 304 stainless steel ks = 14.4 W/(m K) at 20°C (Note that figure 1.6 shows very little increase in k for stainless steel in the range of 300°C to 700°C.)
The gravitational force is a conservative force
Indicate whether the statement is true or false
If you hold out your thumb at arm's length and rapidly blink each eye closed in an alternating pattern, your thumb appears to move left and right. This exercise is an example of _____________
Fill in the blank(s) with correct word
Radio waves are diffracted by large objects such as buildings, whereas light is not noticeably diffracted. Why is this?
A) Radio waves are unpolarized, whereas light is normally polarized. B) The wavelength of light is much smaller than the wavelength of radio waves. C) The wavelength of light is much greater than the wavelength of radio waves. D) Radio waves are coherent and light is usually not coherent. E) Radio waves are polarized, whereas light is usually unpolarized.