Naked Science Forum

Non Life Sciences => Technology => Topic started by: chris on 29/04/2011 09:19:25

Title: Are car or aeroplane outside temperature measures subject to wind chill?
Post by: chris on 29/04/2011 09:19:25

Is the "outside temperature" probe on a car subject to wind-chill effects?

Title: Are car or aeroplane outside temperature measures subject to wind chill?
Post by: RD on 29/04/2011 10:36:57

“Wind chill” (feeling colder than the actual ambient temperature) only applies to sweaty humans …

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The Wind chill measures the effect of wind speed on the perception of temperature.
In windy conditions, the air feels cooler than it actually is, because of increased perspiration.[evaporation (http://en.wikipedia.org/wiki/Evaporation#Theory)]

http://en.wikipedia.org/wiki/Apparent_temperature_%28disambiguation%29


It does not apply to non-sweating things ...

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For inanimate objects, the effect of wind chill is to reduce any warmer objects to the ambient temperature more quickly. It cannot, however, reduce the temperature of these objects below the ambient temperature

http://en.wikipedia.org/wiki/Wind_chill#Explanation


If anything on the outside of a fast flying aircraft there would be (some) “wind heat” due to air friction.
http://en.allexperts.com/q/Aeronautical-Engineering-1809/2009/8/Air-friction-heating.htm