Thermophysical properties of gaseous refrigerants from speed of sound measurements. I. Apparatus, model, and results for 1,1,1,2‐tetrafluoroethane R134a

1990 ◽  
Vol 93 (4) ◽  
pp. 2741-2753 ◽  
Author(s):  
A. R. H. Goodwin ◽  
M. R. Moldover
Keyword(s):  
Speed Of Sound ◽  
Thermophysical Properties

scholarly journals Thermophysical Properties of 1-Butanol at High Pressures

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5046
Author(s):  
Marzena Dzida
Keyword(s):  
Speed Of Sound ◽  
Thermophysical Properties ◽  
High Pressures ◽  
Fuel Additive ◽  
Temperature Range ◽  
Isobaric Thermal Expansion ◽  
Isentropic And Isothermal Compressibilities ◽  
Overlap Method ◽  
Pulse Echo ◽  
Better Than

1-Butanol can be considered as a good fuel additive, which can be used at high pressures. Therefore, the knowledge of high-pressure thermophysical properties is crucial for this application. In this paper, new experimental data on the speed of sound in 1-butanol in the temperature range from 293 to 318 K and at pressures up to 101 MPa are reported. The speed of sound at a frequency of 2 MHz was measured at atmospheric and high pressures using two measuring sets operating on the principle of the pulse–echo–overlap method. The measurement uncertainties were estimated to be better than ±0.5 m·s−1 and ± 1 m·s−1 at atmospheric and high pressures, respectively. Additionally, the density was measured under atmospheric pressure in the temperature range from 293 to 318 K using a vibrating tube densimeter Anton Paar DMA 5000. Using the experimental results, the density and isobaric and isochoric heat capacities, isentropic and isothermal compressibilities, isobaric thermal expansion, and internal pressure were calculated at temperatures from 293 to 318 K and at pressures up to 100 MPa.

Volumetric, Ultrasonic and Viscometric Studies of Aspirin in the Presence of 1-Octyl-3-Methylimidazolium Bromide Ionic Liquid in Acetonitrile Solutions at T=(288.15–318.15) K

2016 ◽  
Vol 230 (12) ◽  
Author(s):  
Hemayat Shekaari ◽  
Mohammed Taghi Zafarani-Moattar ◽  
Seyyedeh Narjes Mirheydari
Keyword(s):  
Refractive Index ◽  
Ionic Liquid ◽  
Speed Of Sound ◽  
Thermophysical Properties ◽  
Acetonitrile Solutions

AbstractIn a continuation of previous studies, thermophysical properties of the systems containing aspirin (ASA), ionic liquid, 1-octyl-3-methylimidazolium bromide ([OMIM][Br]) and acetonitrile (MeCN) have been determined. These properties contain density, viscosity, speed of sound and refractive index measured at

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