"JimH" wrote in message
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On Feb 9, 12:43 am, "Calif Bill" wrote:
"JimH" wrote in message

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"RCE" wrote in message
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"Calif Bill" wrote in message
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Wind Chill. I do not think it refers to living tissue. I think
the
definition is how much heat transfer would occur in still air vs.
Moving air. some low speed of air. -15 degrees with a wind chill
of -30, says the same heat loss would occur if the temp was -30
and
no wind movement. Nothing to do with evaporation but with the
tendency of the air to heat up near the warmer object, slowing
down
heat transfer.

The term "Wind Chill" applies *only* to living tissue. It refers
to
the rate of cooling (limited by the ambient temperature) that
occurs
to exposed living tissue. The increased rate of cooling can exceed
the living tissue's ability to replace the heat lost and things
like
frostbite can quickly occur.

The wind can't make it colder. It only makes the rate of heat
transfer and cooling of the object faster. Heat transfer is higher
in
turbulent flow.

Eisboch

Did not realize it applied only to human tissue. Thought it was
just a
rate of heat transfer regards air movement.

Glad to see you finally got it. :-)

actually is the same whether it is tissue or beer cans.

sigh

Sigh my ass. The reason there is a Wind Chill factor is the wind will
carry
away the extra BTU's that still air can not. The body's response is
that
it tries to get to the ambient temperature faster. At the same speed as
if
the air was xx degrees colder. The Wind Chill factor. Same reason that
RCE
stated that turbulent flow will transfer more heat. Laminar flow will
have
a small slow speed component of air right next to the surface. That
small
bit of air will insulate the surface from the air above. Works with beer
cans also. Same reason that a car radiator works with air flowing over
it.
No fan and hot day and sitting still and you overheat.

Agreed. But the beer or radiator fluid will not go below ambient
temperature no matter how much air you blow on it.

On the other hand, living tissue will and this is traditionally called
the Wind Chill factor.


The flesh will not go below ambient temperature. Wind chill is the apparent
amount of heat that would be lost if the temperature was lower. If the
temperature is 5f and a wind chill is -30f, the flesh will lose heat at
the same rate as if there was no wind and the temperature was -30. But the
flesh will not go below 5f. If it tried to go below 5f, then the Wind Chill
Factor would be the
Wind Heating factor.