Surface tension is a direct result of
A) viscosity.
B) Archimedes' principle.
C) adhesive forces between molecules in a liquid or solid.
D) cohesive forces between molecules in a liquid.
Answer: D
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Calculate the water side heat transfer coefficient and the coolant pressure drop per unit length of tube for the core of a compact air-to-water intercooler for a 3.7 MW gas turbine plant. The water flows inside of a flattened aluminum tube having the cross- section shown belowThe inside diameter of the tube before it was flattened was 1.23 cm with a wall thickness (t) of 0.025 cm. The water enters the tube at 15.6°C and leaves at 26.7°C at a velocity of 1.34 m/s.
GIVEN
Water flow in a flattened tube as shown above
Inlet temperature (Ti) = 15.6°C
Outlet temperature (To) = 26.7°C
Water velocity (V) = 1.34 m/s
FIND
(a) The heat transfer coefficient on the inside of the tubes hc
(b) The pressure drop per unit length (?p/L)
ASSUMPTIONS
Steady state
Fully developed flow
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for water at the average temperature of 21.1°C
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A. all of Newton's laws of motion B. Newton's law of gravity C. Ohm's law D. Faraday's law
Give the Kelvin-Planck statement of the Second Law of Thermodynamics
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