This is a lot of good work, Alan. I am amazed at the number of high
quality posts on Vortex. I am having trouble keeping up because each
post warrants a good deal of thought.
I examined pictures of the manifold and created a diagram to capture the
important features. [I made a small .png versi
Well, are you sure? If you see the object in 3D, the object is
not symmetrical, so, it is not a matter of just increasing the radial
value.
2011/10/26 Alan J Fletcher
> At 04:44 PM 10/26/2011, Daniel Rocha wrote:
>
>> There is a problem with you simulation, in my opinion. The number of cells
>>
At 04:48 PM 10/26/2011, David Roberson wrote:
I was referring to
the fact that the steam is condensing and not just loosing heat slowly
along the entire distance.
The manifold section of pipe is very short compared to the length of the
hose from the eCat, and the (effective) length inside the he
At 04:44 PM 10/26/2011, Daniel Rocha wrote:
There is a problem with you simulation, in my opinion. The number of
cells in your model increases linearly with the distance from the
flow. But it increases linearly because your model is 2D. If it were
a 3D model, the number of cells would increase
am sure you can get it resolved.
-Original Message-
From: Alan J Fletcher
To: vortex-l
Sent: Wed, Oct 26, 2011 7:26 pm
Subject: Re: [Vo]:Manifold mispositioning makes measurements meaningless
http://www.engineeringtoolbox.com/overall-heat-transfer-coefficients-d_284.html
water
There is a problem with you simulation, in my opinion. The number of cells
in your model increases linearly with the distance from the flow. But it
increases linearly because your model is 2D. If it were a 3D model, the
number of cells would increase by the square of the distance, and the
diffusion
http://www.engineeringtoolbox.com/overall-heat-transfer-coefficients-d_284.html
water-copper-air is 13.1 (W/m2 K)
steam-copper-air is 17
And for flowing water/steam, I think that the MASS flow is what
counts, not the volume flow, so there isn't a big transferdifference
between the two.
-l
Sent: Wed, Oct 26, 2011 7:06 pm
Subject: Re: [Vo]:Manifold mispositioning makes measurements meaningless
At 03:55 PM 10/26/2011, David Roberson wrote:
Maybe you have an error with your simulation since the number does not seem to
match the real world results. What kind of flow did you
At 03:55 PM 10/26/2011, David Roberson wrote:
Maybe
you have an error with your simulation since the number does not seem to
match the real world results. What kind of flow did you assume in
the primary? I think that vapor condensation is where the most
action is since that takes so much more e
. I wish someone
would have been wise enough to place the thermocouple well.
Dave
-Original Message-
From: Alan J Fletcher
To: vortex-l
Sent: Wed, Oct 26, 2011 6:49 pm
Subject: [Vo]:Manifold mispositioning makes measurements meaningless
I have built a SPICE circuit simulation model
I have built a SPICE circuit simulation model of the manifold --- and
the results are VERY BAD
An initial small-scale model indicates that the ENTIRE top of the
manifold is "contaminated" by the HOT side.
Even with a "stepped" manifold (representing the various pipe
fittings) , and wit
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