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Scott Keadle
Joined: 10 Jan 2006
Posts: 31
Location: Lake Norman, North Carolina
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 Posted: Mon Jan 29, 2007 12:33 pm Post subject: RVSouthEast-List Digest: 13 Msgs - 01/28/07 |
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I read all these posts on the digest, so sorry for the delay, but I have to
add my two cents. Bournelli and Newton, notwithstanding (when we got to
railroad cars I was worried Max Planck had entered the fray), the most
notable thing in Steve's post was the instruction to disconnect the wires to
the transducer and reconnect them. I hate to agree with Boyd, but I think
it's either wires or, as James pointed out, an obstruction that was cleared.
Scott
________________________________ Message 13
____________________________________
Time: 07:48:19 PM PST US
From: "Ed Anderson" <eanderson(at)carolina.rr.com>
Subject: Re: bubbles and pressure was : Fuel Pressure
Fixed
I agree, Stormy, if you have a steady state condition. However, when
the system environment is not static but dynamic then you can indeed
have fluctuation states that cause the state in one part of the system
to be different than another part.
Consider two rail road cars separated by a untearable bag of air,each
car with a force measuring instrument (after all pressure is simply
force over an area, right?). Then back an engine into the first car at
some rate of speed. The first car will "feel" the impact essential
instantaneously over its entire length and the force measuring device on
the first car will register the force of the impact. However, at the
same instant the force measuring sensor on the second car will register
zero force. It will continue to register zero force until the pressure
inside the air bag has increased sufficiently ( due to the compression
forces) that the compressed air is able to transmit some force to the
second car. Yes, eventually, the second car will measure the same force
as the first car - but not instantaneous, there will be a delay. Now
repeated back up the engine and ram the cars again and again and you
have a rather chaotic and dynamic system with the air compressing,
collapsing, rebounding, etc.
Therefore, you can have two different sections of the liquid
(separated by bubble(s)) that see difference forces and therefore
pressures varying in a dynamic manner. In a real fuel line the
situation is considerably more dynamic than my example.
In a fuel line with multiple bubbles the situation can be complex. You
have a pump that may be creating bubbles through caviation, you will
have some amount of air bubble being re-absorbed back into the fluid,
you have bubbles being created by pressure drops through fittings,
temperature increases, etc. You may even have a leak that permits air
into the system. So depending on the level your are viewing it at -what
may appear to be a steady state system is its anything but a steady
state system.
Air in fluid lines is generally not a good thing - just how bad the
effect can - depends on a number of variables.
But, if you have had no problems - then I certainly wouldn't worry about
all those little bubbles {:>)
my 0.02 and I'm off to bed
Ed
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_________________
Scott Keadle
14A, Lake Norman Airpark
N426AK RV-10, final assembly
N246SK, Giles 202, flying |
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bburril(at)carolina.rr.co
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| Posted: Mon Jan 29, 2007 2:35 pm Post subject: RVSouthEast-List Digest: 13 Msgs - 01/28/07 |
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Well thats all it was,two cents worth.
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Scott Keadle
Joined: 10 Jan 2006
Posts: 31
Location: Lake Norman, North Carolina
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| Posted: Mon Jan 29, 2007 4:21 pm Post subject: Re: RVSouthEast-List Digest: 13 Msgs - 01/28/07 |
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Well Ben, between me and Ed, that's four cents. With another twenty one cents, we could afford "short-time" with your girlfriend.
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_________________
Scott Keadle
14A, Lake Norman Airpark
N426AK RV-10, final assembly
N246SK, Giles 202, flying |
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bburril(at)carolina.rr.co
Guest
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| Posted: Mon Jan 29, 2007 6:27 pm Post subject: RVSouthEast-List Digest: 13 Msgs - 01/28/07 |
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Which one, she might be cheaper then that.
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