bigleaf (version 0.8.2)

kinematic.viscosity: Kinematic Viscosity of Air

Description

calculates the kinematic viscosity of air.

Usage

kinematic.viscosity(Tair, pressure, constants = bigleaf.constants())

Value

v -

kinematic viscosity of air (m2 s-1)

Arguments

Tair

Air temperature (deg C)

pressure

Atmospheric pressure (kPa)

constants

Kelvin - conversion degree Celsius to Kelvin
pressure0 - reference atmospheric pressure at sea level (Pa)
Tair0 - reference air temperature (K)
kPa2Pa - conversion kilopascal (kPa) to pascal (Pa)

Details

where v is the kinematic viscosity of the air (m2 s-1), given by (Massman 1999b):

$$v = 1.327 * 10^-5(pressure0/pressure)(Tair/Tair0)^1.81$$

References

Massman, W.J., 1999b: Molecular diffusivities of Hg vapor in air, O2 and N2 near STP and the kinematic viscosity and thermal diffusivity of air near STP. Atmospheric Environment 33, 453-457.

Examples

kinematic.viscosity(25,100)