Ethyl alcohol (ethanol) is to be boiled in a vertical tube of 2 cm inside diameter. The ethanol is to be boiled at a temperature of 78.50C and a pressure of 3000 kPa when the tube inside surface temperature is 200ºC. The ethanol entering the tube may be assumed to be 10% saturated vapor, heat of vaporization, hnfg of 842 J/kg, bubble diameter of 1 mm, and bubble velocity may be taken as 0.24 m/s. Estimate the nucleate pool boiling convective heat transfer coefficient.
What will be an ideal response?
The determination of the convection heat transfer coefficient can be made with the
Chen Method and Equation 10-13
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The figure shows a cross section of three parallel wires each carrying a current of 20 A. The currents in wires A and B are out of the paper, while that in wire C is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 2.0-m length of wire A?
a.
23 mN
b.
64 mN
c.
32 mN
d.
46 mN
e.
55 mN
How large a force is necessary to stretch a 2.0 mm radius steel wire (Y = 2.0 × 10^11 N/m2) by 2.0%?
a. 5.0 × 10^4 N c. 2.5 × 10^3 N b. 2.5 × 10^4 N d. 1.3 × 10^4 N
How have scientists been able to determine that Earth has a liquid metal outer core?
What will be an ideal response?
The most important agent of erosion is
A) water. B) glaciation. C) wind. D) wave action.