kinematic.viscosity: Kinematic Viscosity of Air

In bigleaf: Physical and Physiological Ecosystem Properties from Eddy Covariance Data

Kinematic Viscosity of Air

Description

calculates the kinematic viscosity of air.

Usage

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

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

Value

v -	kinematic viscosity of air (m2 s-1)

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)    

bigleaf documentation built on Aug. 22, 2022, 9:09 a.m.