I am working on another article for the EAA
so I need some help from you heat transfer guru's.

Anything incorrect in this fragment?
Anything that could be worded better?

"There is no cooling but air cooling. Ultimately all waste heat
must be dissipated by the air surrounding the aircraft. There
are three main ways of transferring heat. Conduction, convection
and radiation. Conduction takes place within the same solid
while convection happens between a solid and a fluid such as air
or water.  Radiation takes place by one object "seeing" another
hotter object. No not nuclear radiation.  You can get a sunburn
at the beach no matter how fast the cooling breeze is blowing.
You do not get a sun burn if you are in the shade. This is a
classic example of heat transfer by radiation. We are mainly
concerned with conduction and convection when cooling an engine."

What do they call the amount of heat transferred per unit time
through a given area such as a cylinder wall? Is that called "flux"?

Paul Lamar

Convection, as I envision it is related to the movement of the fluid, and is not
a heat transfer mechanism per se. Heat is conducted from the metal to the fluid through
the "film coefficient" which is impacted by the characteristics of the fluid,
including pressure and velocity and other "transport" properties. The rate of transfer
per area, such as from the hot gasses to the wall in the throat area of the Space
Shuttle Main Engine we called "heat flux" which in this case approaches 100 BTUs per
inch squared second. - Vance

 
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