On 14 Aug, 11:47, wrote:
On Fri, 14 Aug 2009 03:37:33 -0700 (PDT)

Andy wrote:
But turbulence does not heat the air. Turbulent air generally stays at

Any movement of one section of a fluid against another will heat it.
Eg if a propeller blows a load of air backwards that air will eventually
stop moving with respect the rest of the air mass around it. How do you
think the energy is lost? As heat of course.


BUT that is friction (between air molecules and of air molecules with
solid objects) doing the heating not the turbulence itself. 'Bruce'
was claiming that the friction was a minor component of the heating,
but friction is pretty much the only source of heating when airflows
are considered.