Release on the IAPWS Formulation 2008 for the Viscosity of Ordinary Water Substance (September 2008)
Description
This formulation is recommended for the calculation of the viscosity
of ordinary water in its fluid phases.
The formulation consists of a dilute-gas term that is only a function of temperature,
a finite-density term as a function of temperature and density, and a
near-critical term as a function of temperature and density.
The near-critical term is negligible except very close to the critical point;
it should be omitted for industrial use and may be omitted for other uses outside
the critical region.
The region of validity the entire stable fluid region from the melting curve
to 1173 K at pressures to 300 MPa, with lower maximum temperatures at higher pressures up
to 1000 MPa; see the release document for details.
It extrapolates in a physically reasonable way outside this region.
Revision History
This Release is the product of the Working Group "Thermophysical Properties of Water and Steam" (TPWS) of the International Association for the Properties of Water and Steam (IAPWS).
This page updated March 11, 2011