# Carbon dioxide - Prandtl Number

## Figures and table showing changes in Prandtl number for carbon dioxide 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 C

_{p}/ k (1)where

μ = absolute or dynamic viscosity (kg/m s, lb_{m}/(ft h))

C_{p}= specific heat (J/kg K, Btu/(lb_{m}^{o}F))

k = thermal conductivity (W/m K, Btu/(h ft^{2}^{o}F/ft))

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

See also** carbon dioxide: **Density and specific weight and Thermal conductivity at varying temperature and pressure and Thermophysical properties, as well as **Prandtl number** of air, ammonia, methane and water.** **

Carbon dioxide Prandtl number at gas-liquid equilibrium pressure, temperature given as °C or °F:

Carbon dioxide Prandtl number at atmospheric pressure, temperature given as °C and °F:

Carbon dioxide Prandtl number at varying temperatures at given constant pressures, SI and Imperial units:

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Carbon dioxide Prandtl number at given temperatures and 1, 10, 50 and 100 bara presure:

Temperature | Prandtl number at given pressures | |||||

[K] | [°C] | [°F] | 1 bara | 10 bara | 50 bara | 100 bara |

220 | -53.2 | 2.5 | 0.792 | 2.70 | ||

233.03 | -40.1 | 9.7 | 0.977 | |||

240 | -33.2 | 13.6 | 0.785 | 0.942 | 2.32 | |

250 | -23.2 | 19.1 | 0.781 | 0.902 | 2.23 | 2.16 |

260 | -13.2 | 24.7 | 0.777 | 0.873 | 2.10 | |

280 | 6.9 | 35.8 | 0.770 | 0.833 | 2.06 | |

287.43 | 14.3 | 39.9 | 2.74 (liq) | |||

287.43 | 14.3 | 39.9 | 1.92 (g) | |||

300 | 26.9 | 46.9 | 0.763 | 0.807 | 2.39 | |

320 | 46.9 | 58.0 | 0.756 | 0.788 | 4.08 | |

340 | 66.9 | 69.1 | 0.750 | 0.774 | 1.53 | |

360 | 86.9 | 80.3 | 0.745 | 0.764 | 1.17 | |

400 | 127 | 102 | 0.738 | 0.749 | 0.938 | |

450 | 177 | 130 | 0.732 | 0.739 | 0.776 | 0.840 |

500 | 227 | 158 | 0.728 | 0.732 | 0.792 | |

600 | 327 | 214 | 0.725 | 0.727 | 0.754 | |

650 | 377 | 241 | 0.725 | 0.726 | 0.734 | 0.745 |

850 | 577 | 352 | 0.723 | 0.724 | 0.726 | 0.730 |

1050 | 777 | 464 | 0.721 | 0.721 | 0.723 | 0.724 |

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