On Feb 7, 6:06 pm, "JoeSpareBedroom" wrote:
"JimH" wrote in message

oups.com...



On Feb 7, 5:54 pm, "JoeSpareBedroom" wrote:
"Eisboch" wrote in message

m...

"JoeSpareBedroom" wrote in message
...

Nice link, but you did not answer the question. Here it is again:

Question: If you put a liquid on a surface, and subject both to moving
air, will the surface be cooled by the evaporation of the liquid?

Yes. But it has nothing to do with wind chill.
It's called the latent heat of evaporation.

Eisboch

OK. So I used the wrong words. But, the wind *does* mess with the
effectiveness of the windshield liquid.

You are changing the scenario you originally posted...............you
initially said the car was standing still.

Regardless, yes wind will accelerate the cooling of the fluid but it
will never go below ambient temperature. There is no wind chill
factor on windshield wiper fluid. ;-)

I said "subject it to moving air", which causes rapid cooling of the
surface, and any remaining liquid. What else explains why the fluid can sit
in the jug in your trunk and not freeze, but freeze in a split second after
hitting the windshield at 50 mph?

It is OK to be wrong Doug. I will not get into the ****ing contest
you want this to turn into. ;-)