Methodology of investigation of binary liquids in the unstable states

Abstract

This work is devoted to the development of a measurement methodology for a new object in the thermophysics of extreme states – a partially-soluble binary liquid, which is short-term transferred to the region of unstable states above the diffusional spinodal. On an example of PPG-425/water solution having the lower critical solution temperature, the key hypothesis of the study on the general measurability of the properties of unstable solutions has been confirmed. The heating rate was varied from 105 to 106 K/s, and the pressure was varied from units of MPa to 100 MPa. The superheat of the solution with respect to the diffusional spinodal was up to 150 degrees. The conditions for the transition from measurements on pure components to measurements on the solution are formulated. The characteristic thermal patterns of the decay of unstable states depending on pressure and heating rate are revealed. The possibility of using this binary solution as a promising coolant in processes with powerful local heat release is assumed.