paper

Speeds of sound for a biogas mixture + + + from = (1-12) MPa at = (273, 300 and 325) K measured with a spherical resonator

arXiv:2409.10962 · doi:10.1016/j.jct.2016.07.033

Abstract

The present work aims to measure speeds of sound in a biogas mixture of + + + , at = (1-12) MPa and = (273, 300 and 325) K, using a spherical acoustical resonator. The results are fitted to the virial acoustic equation of state, and the virial acoustic coefficients are obtained, and and extrapolated to zero pressure, determining the adiabatic coefficient as perfect gas, , and the isobaric and isochoric heat capacities as perfect gas, and , respectively. The speeds of sound are acquired with a mean expanded relative uncertainty of 165 parts in ( = 2) and are compared with the results predicted by the reference equation of state for this kind of mixture (natural gas-like mixtures), EoS GERG-2008. Relative deviations between experimental data and values estimated by this model were less than 700 parts in at = 325 K, and below 400 parts in , and within measurement uncertainty of at = 300 K, although appreciably higher at isotherm = 273 K at the highest pressure data for this work, and even reaching values above 3 400 parts in .

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Speeds of sound for a biogas mixture $CH_{4}$ + $N_{2}$ + $CO_{2}$ + $CO$ from $p$ = (1-12) MPa at $T$ = (273, 300 and 325) K measured with a spherical resonator · wovepaper