At 10:15 AM 8/8/2011, Jed Rothwell wrote:
Abd ul-Rahman Lomax wrote:
This is in line with what I have heard from other experts.
That's right. But now ask those experts what will happen if the
feed water spills into the outlet tube. They have never seen such a thing.
On the contrary this is a common occurrence. It happens when boilers
are starting up. I have seen it happen at Hydrodynamics Inc. There
is a dramatic and easily observed transition when the flow changes
from water to steam. It is easy to determine this is happening, and
experts say there is no chance it is happening in this case. Perhaps
you are right and they are wrong, but I wouldn't be so confident of
that if I were you.
Great, Jed. You claim that experts say this. Where? The expert
consulted by NyTeknik does not appear to consider the issue. He only
considers normal wetness of steam.
Where has an expert considered what you claimed?
You should not assume you know more about this subject than experts
who have devoted their careers to it.
I don't. They know thousands of times as much as me. Except maybe one
small possibility that I've thought of that they didn't. That's all. At most.
Really, I'd like one of these experts to consider what would happen
if we take a fixed water flow that is being entirely vaporized by
some magical balance of energy and flow, and then back off on the
heat a bit. Say we only vaporize half the water, not all of it. All
the water is heated to boiling, and then half of it vaporizes.
So what happens? Half the water spills into the tube, half is
vaporized and also flows into the tube. This is 50% quality steam, in
the tube. Because steam is so much more voluminous than the liquid,
because of what will happen at the orifice, this will be mostly steam
by volume.
As has been pointed out, steam quality does not vary with droplet
size. It's purely mass ratio.
Boilers are one of the most widespread technologies on earth. People
have been studying them for 200 years. They know a great deal about
boiler performance and steam. I know little about them, but the
experts that NyTeknik and I have contacted express no doubt that
Rossi's rough estimate of enthalpy is correct. They disagree with
the self-appointed experts here.
No, they don't. We have not had a conversation. Jed, this is citing
someone as an authority who has not had this conversation, who has
not addressed these issues. It's your own fantasy.
