At 04:34 PM 6/22/2011, Mark Iverson wrote:
Michele wrote:
"Condense on the probe? What is the temperature
of the probe? > 100° C or less?
Galantini would not make such a mistake..."
Exactly... As soon as the probe was placed in
the steam flow, some condensation would occur on it,
but within seconds the probe would heat up and
the condensation will evaporate.
Why will the condensation evaporate? Only if the
steam is superheated will it be sure to
evaporate. Because of a small level of cooling in
the path to the place where the probe is sitting,
there would normally be some small level of water
present; water is formed when the steam heats
something like the walls of the vessel -- or the
probe, initially. That steam isn't totally dry,
and not being totally dry, it cannot remove
water. It might, if the flow rate is high enough,
blow it off. This would depend on how much the
water adheres to the probe.... Maybe it would blow off.
As some have pointed out, steam engines have to
deal with steam quality issues, and measures are
taken to dry the steam, they are basically
mechanical, catching or trapping the water droplets.
