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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Coulomb's law is similar in form to
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
What will be an ideal response?
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
What is the greatest difference between quantities described by linear and by exponential growth?
What will be an ideal response?