Abstract
WHEN the diameter of a round tube is very much larger than the mean free path (m.f.p.) of the molecules of a gas flowing through it the volumetric flow F of the gas in the axial z direction is given by the expression 
where a, μ, and p are the tube radius, and the gas viscosity and pressure, respectively.
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References
See Roberts, J. K., Heat and Thermodynamics, fourth ed., 75 (Wiley, New York).
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GOLAY, M. Flow of Gas at Low Pressure. Nature 211, 1074–1075 (1966). https://doi.org/10.1038/2111074a0
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DOI: https://doi.org/10.1038/2111074a0
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