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Methane - Prandtl number

Figures and table showing changes in Prandtl number for methane with changes in temperature and pressure

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The Prandtl Number - Pr - is a dimensionless number approximating the ratio of momentum diffusivity (kinematic viscosity) to thermal diffusivity - and is often used in heat transfer and free and forced convection calculations.

The Prandtl number can for calculations be expressed as

Pr =  μ Cp / k                           (1)

where
μ = absolute or dynamic viscosity (kg/m s, lbm/(ft h))
Cp = specific heat (J/kg K, Btu/(lbmoF))
k = thermal conductivity (W/m K, Btu/(h ft2oF/ft))

Below, Prandtl numbers for methane at varying temperatures and pressures are given in figures and table.

See also other properties of Methane at varying temperature and pressure: Density and specific weight, Dynamic and kinematic viscosity, Specific heat (Heat capacity) and Thermal conductivity, and Thermophysical properties at standard conditions, as well as Prandtl number of Air, Ammonia, Carbon dioxide, Nitrogen, Propane and Water.

Methane Prandtl number at atmospheric pressure, temperature given as °C or °F:

Methane Prandtl no temperature 1 atm C
Methane Prandtl no temperature 1 atm F

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Methane Prandtl number at varying temperatures and constant pressures, SI and Imperial units:

Methane Prandtl no temperature pressure C

Methane Prandtl no temperature pressure F
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Methane Prandtl number at given temperatures and 1, 10 and 100 bara presure:

Temperature

Prandtl number at given pressures

[K] [°C] [°F] 1 bara,
14.5 psia

10 bara,
145 psia

100 bara,
1450 psia
160 -113 -172 0.7721 0.8659 1.629
180 -93.2 -136 0.7583 0.8170 1.640
200 -73.2 -99.7 0.7487 0.7892 1.867
220 -53.2 -63.7 0.7420 0.7726 2.055
240 -33.2 -27.7 0.7369 0.7607 1.453
260 -13.2 8.3 0.7328 0.7515 1.148
280 6.9 44.3 0.7299 0.7452 1.007
300 26.9 80.3 0.7279 0.7402 0.9304
320 46.9 116 0.7261 0.7370 0.8824
340 66.9 152 0.7243 0.7341 0.8501
360 86.9 188 0.7234 0.7312 0.8269
400 127 260 0.7216 0.7276 0.7968
500 227 440 0.7182 0.7233 0.7560
600 327 620 0.7155 0.7179 0.7385
700 427 800 0.7127
800 527 980 0.7099
900 627 1160 0.7082
1000 727 1340 0.7060

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