Compare the critical heat flux for a flat horizontal surface with that for a submerged horizontal wire of 3-mm-diameter in water at saturation temperature and pressure.
GIVEN
? Flat, horizontal surface and a submerged, horizontal wire
FIND
(a) Critical heat flux for both geometries
ASSUMPTIONS
? The water is at atmospheric pressure
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13
From Table 9.3, entry #5, the ratio of critical heat fluxes for two geometries is
The bubble length scale, Lb is calculated from
The wire has about 7% higher critical heat flux than the horizontal plate.
You might also like to view...
A 2 inch diameter fluorescent light is mounted horizontally as shown. Estimate the heat transfer per unit area if the light surface is 85ºF and the surrounding air is 65ºF.
What total energy is stored in the group of capacitors shown if the potential difference Vab is equal to 50 V?
a.
48 mJ
b.
27 mJ
c.
37 mJ
d.
19 mJ
e.
10 mJ
A 1.5-kg mass attached to spring with a force constant of 20.0 N/m oscillates on a horizontal, frictionless track
At t= 0, the mass is released from rest at x= 10.0 cm. (That is, the spring is stretched by 10.00 cm.) (a) Determine the frequency of the oscillations. (b) Determine the maximum speed of the mass. Where does the maximum speed occur? (c) Determine the maximum acceleration of the mass. Where does the maximum acceleration occur? (d) Determine the total energy of the oscillating system. (e) Express the displacement as a function of time.
The presence of _____ on the Moon implies that the craters on the Moon were formed by impacts
A) ejecta B) magma oceans C) the Maxwell Montes D) permafrost