Compressibility studies of some vegetable oils up to 1 GPa

Abstract

The paper presents compressibility studies of some vegetable oils within the range of 1 GPa. The measurements of the volume were done for rapeseed oil, soy oil, sunflower oil and linseed oil at constant temperature. On this basis, the modified Tait equation coefficients were evaluated. In the case of rapeseed oil, soy oil and sunflower oil, the discontinuity of P–V characteristics for phase transition has been observed. The value of Tait coefficients for the pressure above the phase transition suggests that the high-pressure phase is solidified. The experiment was conducted with a computer-based data acquisition system with software written in National Instruments LabVIEW™ graphical programming language. Piston displacement was measured by electronic digital calliper with RS232 interface.

Keywords:

• compressibility
• vegetable oils
• Tait equation
• high pressure
• phase transitions