If a nitrogen atom and a slightly heavier oxygen atom have equal kinetic energies, which has the greater average speed?
A) nitrogen
B) oxygen
C) both the same
D) need more information
Answer: A
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Reconsider the heat exchanger of Problem 6.38 with an inline tube arrangement, where the centerlines of the tubes are spaced 7.5 cm apart, both in the longitudinal and transverse directions. Compare the results with those for the staggered tube arrangement and comment upon the difference. Also, which of the two arrangements is expected to have a larger pressure drop?
GIVEN
• Air flow through a tube bank
• Tube spacing (S) = 7.5 cm = 0.075 m
• Air temperature (Ta) = 60°C
• Air velocity (Us) = 1 m/s
• Tube outside diameter (D) = 6 cm = 0.06 m
• Tube wall temperature (Tw) = 117°C FIND
• The average heat transfer coefficient ( ch )
• Steady state
SKETCH
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Which of the following molecules is the most polar?
A) HCl B) BrF C) CO D) Image