Both conventional fossil fuel and nuclear power plants
A. contribute to the problem of acid rain.
B. produce waste heat that can affect the weather or upset the ecology of rivers or lakes.
C. produce carbon dioxide, which may increase global warming.
D. produce hazardous waste products that must be stored in isolation for thousands of years.
Answer: B
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An aniline-alcohol solution is flowing at a velocity of 3 m/s through a long, 2.5 cm-ID thin-wall tube. Steam is condensing at atmospheric pressure, on the outer surface of the tube, and the tube-wall temperature is 100°C. The tube is clean, and there is no thermal resistance due to a scale deposit on the inner surface. Using the physical properties tabulated below, estimate the heat transfer coefficient between the fluid and the pipe using and compare the results. Assume that the bulk temperature of the aniline solution is 20°C and neglect entrance effects.
GIVEN
• An aniline-alcohol solution flowing through a thin-walled tube
• Tube is clean with no scaling on inner surface
• Velocity (V) =3 m/s
• Inside diameter of tube (D) = 2.5 cm = 0.025 m
• Tube wall surface temperature (Ts) = 100°C
• Solution has the properties listed above
• Solution bulk temperature (Tb)= 20°C FIND
• The heat transfer coefficient ( ch ) using: (a) Equation (7.61) (b) Equation (7.66)
ASSUMPTIONS
• Steady state
• Entrance effects are negligible
• Thermal resistance of the tube is negligible
• Tube wall temperature is constant and uniform
• Fully developed flow
SKETCH
PROPERTIES AND CONSTANTS
The density of water ? 1000 kg/m3
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A. 4.5 km B. 1.5 km C. 5.9 km D. 3.0 km
Spectroscopic parallax denotes the apparent shift in the position of a star when observed form different positions of a source
Indicate whether the statement is true or false
What key event happened during the decoupling epoch?
A) Pairs of neutrons and protons were created. B) Electrons and positrons were created. C) Expansion cooled the universe enough that protons could capture electrons in orbit. D) Dark energy accelerated the cosmos on to infinity. E) The universe underwent a brief period of very rapid expansion.