Measurement of speed of sound of di-isopropyl ether (DIPE) using spontaneous brillouin scattering method

In this work, a speed of sound measuring apparatus for uids was developed, and the measuring uncertainty of temperature, pressure and speed of sound are 0.02 K, 10 kPa and 0.5%, respectively. The speed of sound of pentane from 310 K to 470 K for the saturated liquid and 350 K to 470 K for the saturated vapor was measured to verify the reliability and stability of the system. Compared with the literature data, the experimental measurement deviation is about 2.5%. The speed of sound of di-isopropyl ether was measured at the temperature from 303.15~453.15 K and at the pressure up to 5.5 MPa, including saturated and compressed liquid. The correlations in this area were proposed, and the calculation deviation of the correlations are 0.51% (saturated liquid) and 0.54% (compressed liquid), respectively.