Kiełczyński P, Szalewski M, Siegoczyński R M, Rostocki A J
Section of Acoustoelectronics, Institute of Fundamental Technological Research, Polish Academy of Sciences, ul. Swietokrzyska 21, 00-049 Warsaw, Poland.
Rev Sci Instrum. 2008 Feb;79(2 Pt 1):026109. doi: 10.1063/1.2836332.
In this paper, a new method for measuring the viscosity of liquids at high pressure is presented. To this end the authors have applied an ultrasonic method using the Bleustein-Gulyaev (BG) surface acoustic wave. By applying the perturbation method, we can prove that the change in the complex propagation constant of the BG wave produced by the layer of liquid loading the waveguide surface is proportional to the shear mechanical impedance of the liquid. In the article, a measuring setup employing the BG wave for the purpose of measuring the viscosity of liquids at high pressure (up to 1 GPa) is presented. The results of high-pressure viscosity measurements of triolein and castor oil are also presented. In this paper the model of a Newtonian liquid was applied. Using this new method it is also possible to measure the viscosity of liquids during the phase transition and during the decompression process (hysteresis of the dependence of viscosity on pressure).
本文提出了一种测量高压下液体粘度的新方法。为此，作者应用了一种使用布勒斯廷-古利亚耶夫（BG）表面声波的超声方法。通过应用微扰法，我们可以证明，由加载在波导表面的液体层产生的BG波复传播常数的变化与液体的剪切机械阻抗成正比。本文介绍了一种采用BG波来测量高压（高达1 GPa）下液体粘度的测量装置。还给出了三油酸甘油酯和蓖麻油的高压粘度测量结果。本文应用了牛顿液体模型。使用这种新方法还可以测量液体在相变过程中和减压过程中的粘度（粘度对压力依赖性的滞后现象）。
