Speeds of sound in {(1 − x)CH4 + xN2} with x = (0.10001, 0.19999, and 0.5422) at temperatures between 170 K and 400 K and pressures up to 30 MPa |
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| Affiliation: | 1. Facultad de Ingeniería, Universidad Javeriana-Cali, Calle 18, 118-250 Cali, Colombia;2. Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK;3. Grupo de Termodinámica y Calibración (TERMOCAL), Dpto. Ingeniería Energética y Fluidomecánica, E.T.S. de Ingenieros Industriales, Universidad de Valladolid, E-47071 Valladolid, Spain;1. University of Silesia in Katowice, Institute of Chemistry, ul. 9 Szkolna, 40-006 Katowice, Poland;2. Southwest State University, 50 Let Oktyabrya st., 94, Kursk 305040, Russia;3. Department of Theoretical Physics, Kursk State University, Radishcheva St., 33, 305000 Kursk, Russia;4. Université de Lorraine, CNRS, LPCT, F-54000 Nancy, France, Boulevard des Aiguillettes, BP 70239, 54506 Vandoeuvre lès Nancy Cedex, France;1. Grupo de Termodinámica y Calibración (TERMOCAL), Research Institute on Bioeconomy, Escuela de Ingenierías Industriales, Universidad de Valladolid, Paseo del Cauce, 59, 47011 Valladolid, Spain;2. DTU Mechanical Engineering, Technical University of Denmark, Nils Koppels Allé, Building 403, 2800 Kgs. Lyngby, Denmark |
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| Abstract: | The speed of sound in {(1 − x)CH4 + xN2} has been measured with a spherical acoustic resonator. Two mixtures with x = (0.10001 and 0.19999) were studied along isotherms at temperatures between 220 K and 400 K with pressures up to 20 MPa; a few additional measurements at p = (25 and 30) MPa are also reported. A third mixture with x = 0.5422 was studied along pseudo-isochores at amount-of-substance densities between 0.2 mol · dm−3 and 5 mol · dm−3. Corrections for molecular vibrational relaxation are discussed in detail and relaxation times are reported. The overall uncertainty of the measured speeds of sound is estimated to be not worse than ±0.02%, except for those measurements in the mixture with x = 0.5422 that lie along the pseduo-isochore at the highest amount-of-substance density. The results have been compared with the predictions of several equations of state used for natural gas systems. |
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