Laboratory of Phase Transitions

Laboratory of Phase Transitions (LPT) focuses on experimental and theoretical research of phase transitions when in a bulk phase in thermodynamically metastable state start to form and subsequently grow clusters of a new phase. The formation of new phase, otherwise known as nucleation, happens for example by the generation of droplets in the supersaturated steam, the formation of bubbles in the superheated liquid, or the crystallization of solid phase in the supercooled liquid. LPT addresses the environmental issues, e.g., the formation of aerosol, water droplets, and ice crystals in atmosphere, together with the industrial applications such as condensation of droplets in steam turbines, cavitation in pumps, and formation of ice crystals in fuel cells. LPT investigates thermophysical properties both under the thermodynamically stable and metastable conditions needed for an accurate description of the phase transitions.
The LPT members are involved in activities of the Czech National Committee for the Properties of Water and Steam (CZNCPWS) aand the international association IAPWS, where they within an international research team investigate thermophysical properties, phase equilibria and phase transitions of aqueous systems, e.g., properties of supercooled liquid water at temperatures down to – 30 °C or phase equilibria of aqueous systems with gas hydrates.

Team of the laboratory   |   Equipment   |   Density of supercooled water   |   Surface tension of supercooled water   |   Nucleation of droplets in CCS systems

Fig. 1 Fig. 2
Fig. 1 Tree branches covered with a continuous layer of ice, which emerged after the rain of supercooled water
Fig. 2 Surface tension of supercooled water down to – 25 °C. New data refuting the anomaly of supercooled water (2nd inflection point) supported by previous measurements.


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