Re: Question: Steam Flow Restriction
- From: Brent Cullimore <brent@xxxxxxxxxx>
- Date: Fri, 15 Jul 2005 15:38:29 -0600
Hi Mike
I changed the pipe to the ID you provided (so small it fell off
FloCAD's pipe schedules!).
I changed the exhaust valve of the tank so that it pulled liquid
preferentially (e.g., from the bottom). Easy enough modeling-wise, but
I think it is too fanciful since there is never that much liquid (by
volume) formed, and it will take a little while for that bit of liquid
to "rain" to the bottom (especially since the wall will stay warm!),
so I'm guessing the valve would just slurp vapor most of the time: not
enough liquid would form at the bottom. So I ended up just letting the
valve exhaust the two-phase fluid as a "fog" which is my guess what
will happen. (If the event is fast enough, droplets might never have
time to form and you'll get a supercooled vapor .... nonequilibrium
.... out at least to the first part of the tube, but enough to effect
the choked flow rate through the exhaust.
Interesting! The line provides enough back-pressure to unchoke the
orifice (at least towards the end of the blow-down event). But if you
start with a room-temperature tube, then it has enough thermal
capacitance to do some serious condensing during the event, especially
if it is heavy-walled. You should see some liquid spewing from the end
of it, at least during the middle of the blow down. Do you?
I'm not seeing much difference in the vent times still, but I'm just
guessing at values and have run out of time to play more, sadly. But
the fact that there are ANY differences between pipe and no-pipe is
interesting.
I'm outta here for the weekend (no usenet access anyway, but you can
reach me at brent@xxxxxxxxxx). For info on the software take a look at
www.crtech.com, or write to sales@xxxxxxxxxxx
Regards,
Brent
On 15 Jul 2005 06:47:07 -0700, "Thunder Weasel" <mcoyle@xxxxxxxxxxx>
wrote:
>Brent:
>
>I made a mistake in my reporting of the situation:
>
>The solenoid valve is a 1/8", not 1/4", and the ID on the 70"
>condensation tube is 0.158"...sorry about that -- I am a software
>engineer, not a mechanical engineer.
>
>Also, the location of the hole in the tank that leads to the chamber is
>on the bottom to drain fluids first, then steam.
>
>I am interested in pursuing this a little further, but not as an
>imposition to you. If it's easy for you to plug some simple numbers,
>I'd sure appreciate it. Would there be any other pieces of information
>that would be useful to you?
>
>BTW -- tell me more about FloCAD and SINDA/FLUINT. They seem like
>something my company would be interested in. What's the ballpark on
>the cost for these tools? Do you have steam tables that account for
>the retention of certain percentages of air? Thanks!
>
>Sincerely,
>-Mike
-----------------------------------------------
Brent Cullimore, brent@xxxxxxxxxx
C&R Technologies, www.crtech.com
Thermal/fluid Software and Consulting
Hot engineering ... Cool software (R)
-----------------------------------------------
.
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