## Abstract

This work aims to provide accurate and wide-ranging experimental new speed of sound data w(p,T) of two binary (CH4 + He) mixtures at a nominal helium content of 5 % and 10 % at pressures p = (0.5 up to 20) MPa and temperatures T = (273.16, 300, 325, 350 and 375) K. For this purpose, the most accurate technique for determining speed of sound in gas phase has been used: the spherical acoustic resonator. Speed of sound is determined with an overall relative expanded (k = 2) uncertainty of 230 parts in 106 and compared to reference models for multicomponent natural gas-like mixtures: AGA8-DC92 and GERG-2008 equations of state. Relative deviations of experimental data from model estimations are outside the experimental uncertainty limit, although all points are mostly within the AGA uncertainty of 0.2 % and GERG uncertainty of 0.5 % and worsen as the helium content increases. Absolute average deviations are better than 0.45 % for GERG and below 0.14 % for AGA models in (0.95 CH4 + 0.05 He) mixture and below 0.83 % for GERG and within 0.22 % for AGA equations in (0.90 CH4 + 0.10 He) mixture.

Original language | English |
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Article number | 105869 |

Number of pages | 14 |

Journal | The Journal of Chemical Thermodynamics |

Volume | 139 |

Early online date | 19 Jul 2019 |

DOIs | |

Publication status | Published - Dec 2019 |

### Bibliographical note

AcknowledgementsThe authors want to thank for the support to Ministerio de Economía, Industria y Competitividad project ENE2017-88474-R and Junta de Castilla y León project VA280P18.

## Keywords

- speed of sound
- acoustic resonance
- methane
- helium
- heat capacities as perfect gas
- virial coefficients
- Methane
- Virial coefficients
- VIRIAL-COEFFICIENTS
- PRESSURES
- Helium
- ARGON
- Acoustic resonance
- ACOUSTIC THERMOMETRY
- MIXTURES
- GAS-CONSTANT R
- EQUATION-OF-STATE
- METHANE
- Speed of sound
- TEMPERATURES
- Heat capacities as perfect gas
- HELIUM

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