Speed of Sound Measurements for Liquid Squalane Up to a Pressure of 20 MPa

IF 2.5 4区 工程技术 Q3 CHEMISTRY, PHYSICAL
Muhammad Imran, Thorsten Windmann, Jadran Vrabec
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Abstract

The speed of sound of liquid squalane is measured with the double-path pulse-echo technique, utilizing a piezoelectric quartz (8 MHz) positioned between two reflectors with distinct path lengths. Calibration of the apparatus is carried out with water, for which highly accurate reference data exist. The present experiments with squalane cover the temperature range from 298.15 K to 493.15 K and a pressure from 0.1 MPa to 20 MPa. The total relative expanded (\(k = 2\)) uncertainty \(U_r(w)\) for the speed of sound is estimated to be ±0.1 %. The present data are consistent with literature values, which are, however, only available at ambient pressure. To validate the present speed of sound measurements, the density and isobaric heat capacity are integrated numerically from the sampled data over most of the measurement range, employing rigorous thermodynamic identities. With deviations of about 0.1 %, the resulting density data are favorably compared with literature values. The resulting isobaric heat capacity, for which just a single reference with data at pressures above the ambient exists, deviates by up to 6 %.

压力为 20 兆帕斯卡的液态角鲨烷的声速测量结果
液态角鲨烷的声速是通过双路径脉冲回波技术测量的,利用的是位于两个路径长度不同的反射器之间的压电石英(8 MHz)。仪器的校准是用水进行的,因为水有非常精确的参考数据。本实验使用的角鲨烷温度范围为 298.15 K 至 493.15 K,压力范围为 0.1 MPa 至 20 MPa。声速的总相对扩展(\(k = 2\) )不确定性\(U_r(w)\) 估计为 ±0.1%。目前的数据与文献值一致,但文献值仅适用于环境压力。为了验证目前的声速测量结果,采用严格的热力学等式,对大部分测量范围内的采样数据进行了密度和等压热容的数值积分。得出的密度数据与文献值相比,偏差约为 0.1%。对于等压热容,仅有一个高于环境压力的数据参考,其偏差高达 6%。
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来源期刊
CiteScore
4.10
自引率
9.10%
发文量
179
审稿时长
5 months
期刊介绍: International Journal of Thermophysics serves as an international medium for the publication of papers in thermophysics, assisting both generators and users of thermophysical properties data. This distinguished journal publishes both experimental and theoretical papers on thermophysical properties of matter in the liquid, gaseous, and solid states (including soft matter, biofluids, and nano- and bio-materials), on instrumentation and techniques leading to their measurement, and on computer studies of model and related systems. Studies in all ranges of temperature, pressure, wavelength, and other relevant variables are included.
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