Speeds of Sound in Methanol at Temperatures from 233.33 to 353.21 K at Pressures up to 20 MPa

Abstract

We report experimental speeds of sound in methanol. Measurements were conducted at temperatures from 233 to 353 K with pressures up to 20 MPa using the double-path length pulse-echo technique. The relative expanded combined uncertainty (k = 2) in measurement was estimated to vary from 0.012 to 0.014%, considering contributions from temperature, pressure, path length calibration, pulse timing, and purity of the sample. Experimental speeds of sound gained in the scope of this work were compared with the equation of state by de Reuck and Craven, as well as with further data from literature.

Experimental speed-of-sound data and a fundamental equation of state for normal hydrogen optimized for flow measurements

“…The expanded uncertainty was calculated considering a coverage factor of k = 2. The dual-path pulse-echo technique is very well established for measurements of the speed of sound in the liquid phase [19][20][21] but can also be used for measurements in the gas phase if the acoustic impedance of the gas is high enough [22][23][24]. The measurement setup used in this work was already applied for measurements in liquid n-pentane [25] and recently in gaseous helium [24].…”