Quote:
Originally Posted by TXiceman
dvspl is not quite correct on windchill for pipes. Wind chill only affects living things like animals and plants which have moisture in them. The higher velocity across a pipe will not "decrease" the pipe temperature to the wind chill factor unless the pipe is wet and kept wet. The higher velocity across the pipe accelerates the heat transfer rate or temperature loss rate.
Ken
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These two statements:
Wind chill only affects living things like animals and plants which have moisture in them.
and
The higher velocity across the pipe accelerates the heat transfer rate or temperature loss rate.
seem to be contradictory.
I agree with the latter statement. The pipe will not cool below the ambient (still air) temperature, regardless of how much wind is blowing. It will cool toward that ambient (still air) temperature more quickly with any wind blowing.
In fact, if there's wind, the pipe will not cool to the ambient (still air) temperature due to the friction of the air on the pipe adding heat to the pipe. At typical wind velocities, there's not enough friction that you'll be able to measure the heat rise from friction. At high speed (like supersonic flight), heat rise from friction becomes a big deal.
Take care,
Stu
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