Speeds of sound for (\(CH_{4}\) + \(He\)) mixtures from \(p\) = (0.5 to 20) MPa at \(T\) = (273.16 to 375) K

• Published in: arXiv.org
• Main Authors: Lozano-Martín, Daniel, Rojo, Andres, Martín, M Carmen, Vega-Maza, David, José Juan Segovia
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 12.09.2024
• Subjects: Deviation; Equations of state; Helium; Mixtures; Natural gas; Uncertainty; Vapor phases
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2409.08128

This work aims to provide accurate and wide-ranging experimental new speed of sound data \(w\)(\(p\),\(T\)) of two binary (\(CH_{4}\) + \(He\)) 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 \(10^{6}\) 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 \(CH_{4}\) + 0.05 \(He\)) mixture and below 0.83% for GERG and within 0.22% for AGA equations in (0.90 \(CH_{4}\) + 0.10 \(He\)) mixture.