What is typical natural gas viscosity at 100 bar & 50°C?

0.018 – 0.022 cP (Lee-Gonzalez-Eakin method) – increases with pressure

When is Z-factor significantly below 1.0?

High pressure (>200 bar) or near critical point. Z can drop to 0.3–0.7

Dranchuk-Abu-Kassem (DAK) is industry standard – error <0.3% up to 200 bar

Advanced property estimation systems for engineering materials. Calculate gas viscosity, compressibility factors, and thermodynamic properties.

Natural Gas: Viscosity = 0.012 cP, Z = 0.95

Density: 0.72 kg/m³

Featured: Natural gas viscosity estimation using Lee-Gonzalez-Eakin method

Estimate gas viscosity at various temperatures and pressures

Lee-Gonzalez-Eakin Lucas method Stiel-Thodos

Calculate gas deviation from ideal behavior

Dranchuk-Abu-Kassem Benedict-Webb-Rubin Peng-Robinson

Estimate enthalpy, entropy and other properties

NIST REFPROP Steam tables Phase equilibrium

Temperature-dependent Cp/Cv calculations

Temperature change analysis in gases

Antoine equation calculations

Henry's law applications

The Lee-Gonzalez-Eakin method is widely used for estimating natural gas viscosity:

μ_g = 10^-4 K exp(X ρ_g^Y)

Where K, X, and Y are functions of temperature and gas density, and ρ_g is the gas density.

The Dranchuk-Abu-Kassem method calculates the Z-factor using reduced properties:

Z = 1 + (A₁ + A₂/T_r + A₃/T_r³) ρ_r + (A₄ + A₅/T_r) ρ_r² + A₅A₆ρ_r⁵/T_r

Where T_r and ρ_r are reduced temperature and density, and A₁-A₆ are correlation constants.