Posted by Steve@Advance on January 12, 2022 at 06:29:13 from (47.37.93.118):
In Reply to: Wind Chill posted by DRussell on January 12, 2022 at 04:44:49:
Wind chill is a combination of things. Mainly moisture on your skin evaporating and carrying away heat, and the moving air over your skin, also carrying away heat. Your body can only produce so much heat, so it quickly feels the difference.
Inanimate objects also experience this to an extent. A heated object will loose it's heat faster with cold air moving across it, and even faster still if there is evaporation also taking place, as in the object is wet.
As far as the windshield freezing when moving, 2 things, the evaporating water was lowering the temperature more efficiently when moving, but probably the one thing having the greatest effect would be the warm air from the engine coming through the gap at the back of the hood.
When stopped, the air flow slows down, the air has more time to warm as it passes through the radiator and over the warm engine, carrying the heat to the windshield. Once moving the cold air dilutes the warm to the point it is scattered and diminished, so it has little effect on the ice.
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