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Nels K
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 Posted: Tue Jul 29, 2003 7:14 pm Post subject: Venturi oxygen diluter |
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I have a design issue relating to an adaptation of the venturi principle.
After many calls to so-called experts, I have been repeatedly dissapointed
in their lack of understanding of my problem. Perhaps someone would give
this
consideration. We need to take a source gas (100% oxygen) at a
driving pressure of about 26psi and dilute the oxygen to a lower
concentration, but without any significant loss of line pressure (26psi).
Is
this theoretically possible? Total flow required through the conduit is
approximately 60lpm.
Regards,
Nels K |
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David Wilkinson
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| Posted: Tue Jul 29, 2003 11:59 pm Post subject: Re: Venturi oxygen diluter |
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"Nels K" <plantmgr@biomeddevices.com> wrote in message
news:PivVa.13601$kU3.3797146681@newssvr10.news.prodigy.com...
[quote]I have a design issue relating to an adaptation of the venturi principle.
After many calls to so-called experts, I have been repeatedly
dissapointed
in their lack of understanding of my problem. Perhaps someone would give
this
consideration. We need to take a source gas (100% oxygen) at a
driving pressure of about 26psi and dilute the oxygen to a lower
concentration, but without any significant loss of line pressure
(26psi).
Is
this theoretically possible? Total flow required through the conduit is
approximately 60lpm.
You can lead a flow of the oxygen and another flow of air into a duct[/quote]
through two legs of a Y-junction with equal areas before and after so you
have parallel flows in one duct. For the dilution to take place there will
have to be either diffusion at very low Reynolds Number or mixing at higher,
realistic Reynolds Number. Alternatively you could have some positive mixing
system to reduce the length over which mixing takes place.
Whichever way you do it the entropy of the gas flow will rise. The entropy
is lower unmixed than mixed. A rise in entropy indicates some loss in total
pressure. Whether this is "significant" depends on what you count as
significant but it will be a loss. |
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