V. P. Skripov

1/f noise and self-organized criticality in crisis regimes of heat and mass transfer

Abstract Thermal fluctuations under the transition from nucleate to film boiling of water on a wire heater and fluctuations of jet form during an outflow of superheated liquid from a pressure vessel were experimentally investigated. It has been found that power spectrum of the fluctuations has got a low frequency component corresponding to a 1/f law (flicker noise). The effect given is connected with the occurrence of nonequilibrium phase transitions in the systems: a crisis of heat transfer under the transition from nucleate to film boiling and a crisis of a flow in boiling-up of superheated liquid jet.

1/f Noise in a nonequilibrium phase transition: Experiment and mathematical model

The results of an experimental investigation of a high-power source of broad-band 1/f noise, which can be generated in a system of two interacting nonequilibrium phase transitions, are presented. This process takes place when a normal conductor-superconductor phase transition is superposed on the critical liquid-vapor transition in a boiling coolant. A mathematical model describing a nonequilibrium phase transition in a complicated nonlinear system with two interacting order parameters, which involves the conversion of white noise into stochastic fluctuations of the order parameters with 1/f and 1/f2 spectra, is proposed. The properties of the model fluctuations with a 1/f spectrum agree qualitatively with the experimentally observed properties. A characteristic difference between the model fluctuations with a 1/f2 spectrum and random walks is also noted.

A critical nonequilibrium phase transition and 1f noise in a current-carrying thin HTSC film-boiling nitrogen system

Abstract Critical phenomena at a nonequilibrium phase transition in a system of a current-carrying thin film of a high-temperature superconductor (HTSC) cooled by boiling nitrogen have been studied experimentally. It is seen that there arises a 1 f noise with a large scope of amplitudes in a wide range of external parameters, that is explained by the interaction of nonlinear thermal processes in a current-carrying superconductor and boiling coolant.

1/f noise at a critical nonequilibrium phase transition

The generation of 1/f noise is demonstrated experimentally in a system consisting of a superconducting film carrying a transport current in contact with a boiling liquid coolant. It is found that wide-band 1/f noise with a large amplitude of the fluctuations is observed over a wide range of parameters. This noise is attributed to the fact that the sub-systems in contact have the same character of the relaxational dependences δT(t)∼ t−1/2.

Jets of incipient liquids

Jets of incipient water escaping into the atmosphere through a short channel are photographed. In some experiments. complete disintegration of the jet is observed. The relationship of this phenomenon with intense volume incipience is considered. The role of the Coanda effect upon complete opening of the jet is revealed. Measurement results of the recoil force R of the jets of incipient liquids are presented. Cases of negative thrust caused by the Coanda effect are noted. Generalization of experimental data is proposed.

The modified Simon equation and some properties of substances on the melting line

AbstractTwo versions of modified Simon equation, which contain a correction factor with additional parameters, are suggested for describing the melting lines of elementary substances. It is demonstrated that the generalizations found for the Simon equation (the universality of component Δ

1/f Fluctuations in Critical Modes of Flow of Superheated Liquid

\tilde s

Drop on a hot plate: the appearance of 1/f noise at the transition to the ball-shaped state

1 of entropy of melting, the convergence of the extreme position of melting line at T → 0 with the limits of thermodynamic stability of coexisting crystal and liquid, and the correlation of the pole of melting line p* with internal pressure pi in the condensed phase in the vicinity of the triple point) retain stability to the variation of the form of dependence pmelt = f(T).