Ice forms on a duct trasporting liquid nitrogen. The duct consists of a circular hole, with diameter
D=0.5 m, surrounded by square insulation, width=0.95 m, and thermal conductivity k=0.223
W/m*K. The inside of the duct is maintained at the boiling temperature of liquid nitrogen (T=-
196 C). The outside ice experiences convection with T=20 C, and an effective h=5 W/m 2
*K.
Calculate the thickness of the ice and the total heat per length that the liquid nitrogen absorbs
from the surroundings. Hint: Assume that the ice is thin enough that conduction through it (and
only through the ice) is effectiviely 1-D and that the parameter of the ice is approximately the
same as the duct (.95x.95m).
Solution
Yeah this is crap, go home chegg.