Speed-of-sound measurements in liquid n-heptane and 2,2,4-trimethylpentane (isooctane)

IF 2.8 3区工程技术 Q3 CHEMISTRY, PHYSICAL

Fluid Phase Equilibria Pub Date : 2025-03-29 DOI:10.1016/j.fluid.2025.114432

T. Dietl, A. El Hawary, K. Meier

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引用次数: 0

Abstract

This paper reports comprehensive and accurate measurements of the speed of sound in liquid n-heptane and 2,2,4-trimethylpentane (isooctane). The measurements were carried out by a double-path-length pulse-echo technique and cover the temperature range between 200 K and 420 K with pressures up to 100 MPa. The expanded uncertainties (coverage factor

k = 2

) amount to 2.1 mK in temperature, 0.005% in pressure, 0.02% in speed of sound in

n

-heptane, and 0.015% in speed of sound in isooctane, with the exception of a few state points at low pressures, where it increases up to 0.03% for

n

-heptane and up to 0.035% for isooctane. Our data are more accurate than previously published data for both fluids. The measurements for isooctane extend the range in which the speed of sound had been measured before from 293 K down to 200 K and from 373 K up to 420 K. We also provide accurate correlations for the speed of sound as a function of temperature and pressure in the range of our measurements. Our data can contribute to developing new, more accurate equations of state for both fluids.

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来源期刊

Fluid Phase Equilibria 工程技术-工程：化工

CiteScore

5.30

自引率

15.40%

发文量

223

审稿时长

53 days

期刊介绍： Fluid Phase Equilibria publishes high-quality papers dealing with experimental, theoretical, and applied research related to equilibrium and transport properties of fluids, solids, and interfaces. Subjects of interest include physical/phase and chemical equilibria; equilibrium and nonequilibrium thermophysical properties; fundamental thermodynamic relations; and stability. The systems central to the journal include pure substances and mixtures of organic and inorganic materials, including polymers, biochemicals, and surfactants with sufficient characterization of composition and purity for the results to be reproduced. Alloys are of interest only when thermodynamic studies are included, purely material studies will not be considered. In all cases, authors are expected to provide physical or chemical interpretations of the results. Experimental research can include measurements under all conditions of temperature, pressure, and composition, including critical and supercritical. Measurements are to be associated with systems and conditions of fundamental or applied interest, and may not be only a collection of routine data, such as physical property or solubility measurements at limited pressures and temperatures close to ambient, or surfactant studies focussed strictly on micellisation or micelle structure. Papers reporting common data must be accompanied by new physical insights and/or contemporary or new theory or techniques.