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**nigelh** · 23rd April 2008, 09:01

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.

23rd April 2008, 09:01	#3 (permalink)
nigelh New member Current Rebreather/s: Inspiration Vision Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Mar 2005 Location: Brighton, Sussex, UK Posts: 883	Re: WOB Air Vs. Helium 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. __________________ nigelh
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