An intercooler of an air compressor is to use a finned flat tube heat exchanger as shown in Figure 9-29. Compressed air at 100 psia, 130ºF passes through the tubes at 100 ft/s and air at 14.7 psia, 70ºF, and 100 ft/s passes around the tubes. Determine the convective heat transfer coefficient, the friction factor for the cooling air outside the tubes, and the overall convective heat transfer coefficient for the intercooler. Assume the inside dimensions of the flattened tubes are 0.105 in by 0.865 in.
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be modified if the problem were not axisymmetric?
GIVEN
Non-axisymmetric, steady, cylindrical geometry with heat generation and convective boundary
condition.
FIND
(a) Difference equations for the centerline and surface control volumes
SKETCH
How many significant figures are in the number 120.070?
A) six B) five C) four D) three
A doubly-ionized lithium atom Li++, which has 3 protons, undergoes a transition from the n = 5 state to the n = 4 state
What is the wavelength of the photon which is emitted during this transition? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 650 nm B) 550 nm C) 450 nm D) 350 nm E) 750 nm
A positive charge and a negative charge held near each other are released. As they move, the force on each particle
a. increases. b. Stays the same. c. decreases.