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paulraymaekers · 23rd April 2008, 09:00

Quote: (Originally Posted by nigelh)

As I understand it WOB depends on viscosity and density and helium is right down on density but up on viscosity.

I know of some medical tests at 1 bar where substituting 22/78 for air reduced the WOB 21% in some tests and 15% in others so I decided it probably wasn't enough of a change to worry about.

If anybody can point me to some proper work on this subject I would be quite interested. The real nasty problem is that in a system like the lungs our concepts of gas flow in terms of Reynolds numbers just falls to bits.

from what I heard: for the CE test it is more difficult to pass with air at 40 meter, then with 10/90 at 100m

regards
paul

23rd April 2008, 09:00	#4 (permalink)
paulraymaekers rEvo's daddy Current Rebreather/s: rEvo Other CCR Home Build Other Rebreather/s: rEvo Other CCR Home Build Join Date: May 2005 Location: belgium Posts: 1,509	Re: WOB Air Vs. Helium Quote: (Originally Posted by nigelh) As I understand it WOB depends on viscosity and density and helium is right down on density but up on viscosity. I know of some medical tests at 1 bar where substituting 22/78 for air reduced the WOB 21% in some tests and 15% in others so I decided it probably wasn't enough of a change to worry about. If anybody can point me to some proper work on this subject I would be quite interested. The real nasty problem is that in a system like the lungs our concepts of gas flow in terms of Reynolds numbers just falls to bits. from what I heard: for the CE test it is more difficult to pass with air at 40 meter, then with 10/90 at 100m regards paul __________________ www.rEvo-rebreathers.com .... the earth is flat, Elvis is alive, and radial scrubbers give longer dwell time than axials...
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