Dynamic Viscosity
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Dynamic Viscosity
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Of a fluid, the ratio of the shearing
stress to the shear of the
motion. It is independent of the velocity distribution, the dimensions of the
system, etc., and for a gas it is independent of pressure except at very low
pressures. Also called coefficient of molecular viscosity, coefficient of
viscosity.
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For the dynamic viscosity � of a perfect gas, the kinetic theory
of gases gives
random heat motion of the gas molecules and is proportional to the square root
of the temperature, and Missing Image:img src="SP7-d_files/lbar.gif" is the mean free path.
For dry air at 0� C, the dynamic viscosity is about 1.7 * 10-4 gram
per centimeter per second.
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Whereas the dynamic viscosity of most gases increases with increasing
temperature, that of most liquids, including water, decreases rapidly with
increasing temperature.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
