AutoEngCalc - Engineering Calculators

Natural Gas Viscosity Calculator

Advanced tools for estimating gas viscosity across a range of conditions with precision using multiple calculation methods.

Viscosity: Lee-Gonzalez-Eakin Method
0.0123 cP

Natural Gas Viscosity Calculators

Advanced tools for gas viscosity estimation with 3 calculation methods

Input Parameters

Enter gas properties and conditions for viscosity calculation

Common Gas Presets
Methane
CH₄
Ethane
C₂H₆
Propane
C₃H₈
Nitrogen
N₂
Viscosity vs. Temperature

Calculation Methods

Select a method for calculating gas viscosity

Empirical correlation for natural gas viscosity at high pressures. Suitable for most hydrocarbon gases.
Generalized method based on reduced temperature and pressure. Works well for both polar and non-polar gases.
Correlation for dense gases at high pressures. Particularly accurate near the critical point.

Results

View calculated viscosity and input parameters

Enter parameters and click "Calculate Viscosity" to see results

Calculation Results

Gas Viscosity

-

centipoise (cP)

Temperature

-

°C

Pressure

-

bar

Molecular Weight

-

g/mol

Critical Temperature

-

K

Critical Pressure

-

bar

Acentric Factor

-

Calculation Method Details

Natural Gas Viscosity Models

Lee-Gonzalez-Eakin Model

The Lee-Gonzalez-Eakin correlation is an empirical method developed specifically for natural gas systems. It calculates gas viscosity (μg) in centipoise (cP) as:

μg = 10-4 K exp(X ρgY)
where K = (9.4 + 0.02 M) T1.5 / (209 + 19 M + T)
X = 3.5 + 986/T + 0.01 M
Y = 2.4 - 0.2 X
ρg = gas density (g/cm3)

Lucas Method

The Lucas method is a generalized correlation that uses reduced temperature (Tr) and pressure (Pr). It first calculates the low-pressure gas viscosity (μ1) then applies a correction factor for high pressure:

μ1 = [0.807 Tr0.618 - 0.357 exp(-0.449 Tr)
    + 0.340 exp(-4.058 Tr) + 0.018] Fp FQ
μ/μ1 = 1 + A PrB / (C PrD + (1 + E PrF)-1)

Stiel-Thodos Correlation

The Stiel-Thodos correlation is particularly accurate for dense gases and near the critical point. It calculates the residual viscosity (μ - μ1) as:

(μ - μ1) ξ = 1.08 × 10-4 [exp(1.439 ρr) - exp(-1.111 ρr1.858)]
where ξ = Tc1/6 / (M1/2 Pc2/3)

Additional Engineering Resources

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Thermal Conductivity Calculator

Material thermal properties

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