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. Author manuscript; available in PMC: 2012 Oct 1.
Published in final edited form as: Ann Biomed Eng. 2012 Jan 14;40(7):1495–1507. doi: 10.1007/s10439-011-0503-2

Table 1.

Fluid properties of (a) He, (b) He-O2 mixture, (c) air, and (d) Xe-O2 mixture.

Fluid ρf (kg/m3) μ (kg/s·m) ν (m2/s) Ret λ × 106 (m)
He 0.166 1.97 × 10−5 11.9 × 10−5 190 0.15
He-O2 0.400 1.98 × 10−5 4.95 × 10−5 460 0.13
Air 1.200 2.04 × 10−5 1.70 × 10−5 1300 0.067
Xe-O2 2.597 2.09 × 10−5 0.810 × 10−5 2800 0.064
*

He-O2 = 80%He-20%O2, Xe-O2 = 40%Xe-60%O2, ρf = fluid density, ν = kinematic viscosity, Ret = trachea Reynolds number based on the trachea hydraulic diameter of 18.3 mm, λ = mean free path.

*

Ret is presented with two significant digits.