Measurement of the acoustic nonlinearity parameter in liquid alkanes under pressure and comparison with the Lee – Kesler correlation
Frederic Plantier, Jean-Luc Daridon, Bernard Lagourette
Measurements of the nonlinear acoustic parameter B/A as a function of pressure and temperature have been conducted for three linear alkanes (n-pentane, n-hexane, and n-heptane) in the pressure range 0.1 to 50 MPa and temperature range 303.15 to 373.15 K. The experimental technique used is based on a phase-comparison method involving measurement of the change of the speed of sound with pressure in an isentropic process. Predictions of the nonlinear acoustic parameter based on the Lee – Kesler correlation are also presented and compared with the experimental values.