Application of SH surface acoustic waves for measuring the viscosity of liquids in function of pressure and temperature

The Ultrasonic Investigation of Phase Transition in Olive Oil up to 0.7 GPa

“…The phase transition in the examined olive oil at 20°C occurred at a pressure of 450 MPa. In our present and previous [6,19,29] investigations, it was shown that in triacylglycerol at 20°C, the phase transition occurred in the same pressure range [6], in diacylglycerol -at about 210 MPa [8]. The transformation time for olive oil was about 6 h, for triacylglycerols, it was about 40 min.…”

“…6. The phase transition in triolein which is the main component of vegetable oils takes a short time (about 40 min) [6]. Therefore, this phase transformation was Adiabatic compressibility of olive oil versus pressure, T = 293 K. The direction of the pressure changes is similar to that in Fig.…”

“…In the case of oils such as castor oil, rapeseed oil, soy oil etc., first order phase transitions have been observed [3][4][5]. Since the common component of those materials is triacylglycerols of fatty acids (mostly of oleic acid), some comparative studies on pure triacylglycerols (laboratory synthetic) such as triolein have been conducted [6,7]. They have shown the occurrence of the same type of phase transition as that in natural oils.…”

Ultrasonic wave based pressure measurement in small diameter pipeline

“…In recent years, ultrasonic non-destructive testing method has been widely used in flow meter [4], stress testing [5], velocity measurements [6], density measurements [7] and distance measurements [8]. The ultrasonic methods can be successfully used because generating ultrasonic into material to obtain its acoustic properties does not disturb the medium, and these methods are accurate, sensitive and have fast response.…”

Inverse procedure for simultaneous evaluation of viscosity and density of Newtonian liquids from dispersion curves of Love waves

“…Dispersion curves (phase velocity and attenuation versus frequency) of ultrasonic Love waves propagating in such structure depend on the material parameters of the layered waveguide structure and are sensitive to changes in the mechanical parameters of the loading liquid (e.g., viscosity and density). [12][13][14][15][16] The sensitivity of the dispersion curves on changes in viscosity and density of the liquid constitutes the physical basis of a new, proposed by the authors, Inverse Method for the simultaneous determination of viscosity and density of liquids.…”