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/(lbm oF))
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:
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 | ||
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