Ivor and Olive Lewis on tue 4 sep 07
Dear Ted Neal ,
My Physics teacher in senior high school would always say "When =
confronted with something unusual, sort out what you are dealing with =
and then go back to first principles"
In this case the principle is that worked out by Bernard Bernoulli. =
There are some assumptions like incompressibility, which gas isn't; none =
viscous flow, well almost in the case of moving gas; no turbulence, =
which I doubt in a kiln and a steady state, when it is possibly =
intermittent.
The principle tells us that the sum of the pressure and the kinetic =
energy per unit volume, and the potential energy per unit volume has the =
same value at all points along the stream line. I think this will tell =
us that the velocity of the flue gas entering the stack is much less =
than the velocity as it pushes past the damper plate. It is possible to =
calculate velocity and rate of displacement if you know the densities of =
the heated air and the cold air using the gravity equation and the =
height difference between the fire ports and the top of the stack.
We live in interesting times so I may have forgotten something.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Ted Neal on tue 4 sep 07
Ivor
I looked up the Bernoulli principle. (Daniel by the way - not that I would have known without looking
it up). It made a lot of sense to me. Thanks for your description.
Best
Ted
Ted Neal
Ball State University
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