8.71 A 50-mm-diameter, thin-walled metal pipe covered with a 25-mm-thick layer of insulation (0.085 W/m.K) and carrying superheated steam at atmospheric pressure is suspended from the ceiling of a large room. The steam temperature entering the pipe is 120°C, and the air tem- perature is 20°C. The convection heat transfer coefficient on the outer surface of the covered pipe is 10 W/m².K. If the velocity of the steam is 10 m/s, at what point along the pipe will the steam begin condensing?

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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8.71 A 50-mm-diameter, thin-walled metal pipe covered with
a 25-mm-thick layer of insulation (0.085 W/m.K) and
carrying superheated steam at atmospheric pressure is
suspended from the ceiling of a large room. The steam
temperature entering the pipe is 120°C, and the air tem-
perature is 20°C. The convection heat transfer coefficient
on the outer surface of the covered pipe is 10 W/m².K.
If the velocity of the steam is 10 m/s, at what point along
the pipe will the steam begin condensing?
Transcribed Image Text:8.71 A 50-mm-diameter, thin-walled metal pipe covered with a 25-mm-thick layer of insulation (0.085 W/m.K) and carrying superheated steam at atmospheric pressure is suspended from the ceiling of a large room. The steam temperature entering the pipe is 120°C, and the air tem- perature is 20°C. The convection heat transfer coefficient on the outer surface of the covered pipe is 10 W/m².K. If the velocity of the steam is 10 m/s, at what point along the pipe will the steam begin condensing?
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