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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Ultrasonic evaluation of thermodynamic parameters of liquids under high pressure
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Ultrasonic evaluation of thermodynamic parameters of liquids under high pressure

机译：超声评估高压下液体的热力学参数

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摘要

In many technological processes (e.g., in the chemical, petrochemical, food, and plastics industries), liquids are subjected to high pressures and temperatures. Therefore, knowledge of their thermodynamic properties is essential for understanding, design, and control of the process technology. Direct evaluation of the thermodynamic parameters of liquids under high pressure, using conventional methods, is very difficult. Therefore, the application of these methods in industrial conditions, particularly in on-line control of the technological parameters of liquids, is practically impossible. Ultrasonic methods (e.g., sound speed measurements) are very suitable for this purpose because of their simplicity and accuracy. The sound velocity is closely related to numerous thermodynamic properties of liquids. The objective of this paper is to address the influence of temperature and pressure on the thermodynamic parameters of liquids, using the example of diacylglycerol (DAG) oil, employing ultrasonic methods. In this paper, we present ultrasonic velocity and density measurements (performed by the authors) in DAG oil over a range of pressures and temperatures. On the basis of experimental results (the sound velocity and liquid density versus pressure and temperature) a series of DAG oil thermodynamic parameters such as specific heat ratio, intermolecular free path length, Van der Waals constant b, surface tension, and effective Debye temperature were evaluated as functions of pressure and temperature.
机译：在许多技术过程中（例如，在化学，石化，食品和塑料工业中），液体要经受高压和高温。因此，了解它们的热力学性质对于理解，设计和控制工艺技术至关重要。使用常规方法直接评估高压下液体的热力学参数非常困难。因此，在工业条件下，特别是在液体技术参数的在线控制中，这些方法的应用实际上是不可能的。超声波方法（例如声速测量）由于其简单性和准确性而非常适合于此目的。声速与液体的多种热力学性质密切相关。本文的目的是通过采用超声波法的二酰基甘油（DAG）油为例，探讨温度和压力对液体热力学参数的影响。在本文中，我们介绍了在一定压力和温度范围内DAG油中的超声波速度和密度测量值（由作者执行）。根据实验结果（声速和液体密度与压力和温度的关系），得出了一系列DAG油的热力学参数，例如比热比，分子间自由程长度，范德华常数b，表面张力和有效德拜温度。评估为压力和温度的函数。

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