Re: fanning yourself - can it be effective?

On Apr 4, 7:53 am, Randy Poe <poespam-t...@xxxxxxxxx> wrote:
On Apr 3, 9:26 pm, Darwin123 <drosen0...@xxxxxxxxx> wrote:

On Apr 3, 8:21 pm, tadchem <tadc...@xxxxxxxxxxx> wrote:
Fanning is *induced* convection.  Ceiling fans move air vertically,
not laterally.  You are wrong too often for me to continue reading....

      Absolutely. You are right, at least in this sentence. It may be
my deficiency. What is the reader supposed to picture when you say the
"cooling" is because of convection? As the poster said, where does the
heat go? I think I know the answer, but...

Into the air which is being transported away. This
can work if the thing you are trying to cool is warmer than
the ambient temperature. It heats a local mass of air above
ambient, you move that air away.

But to get skin below ambient temperature, you need
another mechanism such as evaporation of sweat.

Since both passive convection and evaporation can occur... well,
passively, the OP is really asking : "If we try to force the
process(es) by muscular action, will the initial change in rate of
cooling by positive (it works) or negative (doesn't work), given the
necessary waste heat of muscular action.

I think the answer is "either", depending on the details, which would
mean there is no law such as the OP's friend predicated. Analytical
thinking is moribund, and our friend's friend is a spouter.

.

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