Methane - Prandtl number vs. Temperature
Figures and table showing changes in Prandtl number for methane with changes in temperature and pressure.
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 number at varying temperatures and constant pressures, SI and Imperial units:
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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, | 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 | ||
