Estimate the maximum heat flux obtainable with nucleate pool boiling on a clean surface for (a) water at 100 kPa on brass, (b) water at 1 MPa on brass.
GIVEN
? Nucleate pool boiling on a clean surface
FIND
? The maximum heat flux obtainable for
(a) water at 1 atm on brass; and
(b) water at 10 atm on brass
ASSUMPTIONS
? Water is at saturation temperature
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for water from Table 9.2 for surface tension
The maximum heat flux for nucleate boiling is given by Equation 9.4
You might also like to view...
Latent Heats: When a sample of water at 0.0°C is cooled to -36.0°C and freezes in the process, 935,000 kJ of heat is liberated. What is the mass of this sample of water? For water LF = 334,000 J/kg, LV = 2.256 × 106 J/kg, and the specific heat of ice is 2050 J/kg ? C°.
A. 2290 kg B. 1145 kg C. 2800 kg D. 12,700 kg
A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the
A) Volkswagen. B) Mack truck. C) same for both.
How do the atmospheres of the Moon and Mercury compare?
A) Mercury's is much denser, like Venus, with much carbon dioxide. B) They are about equal, each only 1% as dense as ours. C) The cooler Moon retains a thicker nitrogen atmosphere. D) As no spacecraft has yet landed there, no information exists about Mercury's. E) Neither body has a permanent true atmosphere.
Compared to a 5-inch prime focus reflector, a 5-inch Newtonian reflector will:
A) have more light gathering power. B) have the same light gathering power. C) be easier to build. D) will have more chromatic aberration. E) will have a larger hole in the center of its mirror.