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Yekaterinburg, Russia

Gasanov B.M.,RAS Institute of Thermal Physics
International Journal of Heat and Mass Transfer | Year: 2016

High-speed filming has been used to investigate the process of nucleate boiling of emulsions with a low-boiling disperse phase on a platinum wire 0.10 mm in diameter. Investigations have been conducted on an emulsion with which a disperse phase and a dispersion medium participate in boiling, and on an emulsion with which only a disperse phase boils. Vaporization at the boiling of an n-pentane/water and an n-pentane/glycerine emulsion at the surface of a wire has been studied. The boiling of disperse phase droplets in a thermal boundary layer by the mechanisms of heterogeneous and homogeneous nucleation has been shown. A model of avalanche-like boiling of superheated disperse phase droplets in a thermal boundary layer has been checked. © 2015 Elsevier Ltd. Source

Baidakov V.G.,RAS Institute of Thermal Physics
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2012

Based on the results of computer simulation of transport coefficients in a Lennard-Jones fluid, it has been shown that in (p,T) coordinates, lines of constant values of coefficients of self-diffusion D and excess shear viscosity Δη extended into the region of superheated liquid and supersaturated vapor have an envelope. Each of the ensembles of such lines is divided into two parts by a critical isoline, where the conditions = c=const (=D,Δη) are fulfilled. One part of this ensemble has as an envelope the branch of the spinodal that refers to superheated liquid; the other part has the branch of the spinodal of supersaturated vapor. The critical point of liquid-vapor equilibrium is the cusp of the spinodal, at which the critical isolines have a common tangent line with the spinodal and the binodal. Thus, at the approach to the spinodal, the relations ( D/p)T→ and ( Δη/p)T→ hold. © 2012 American Physical Society. Source

Baidakov V.G.,RAS Institute of Thermal Physics
Low Temperature Physics | Year: 2013

This review addresses the kinetics of spontaneous boiling-up of liquefied gases and their solutions. It discusses the theories of thermal and quantum nucleation in metastable liquids. The experimental methods for studying the nucleation kinetics are outlined. The experimental data on the attainable superheating temperature for cryogenic liquids and solutions of liquefied gases are presented in a wide range of pressures, including negative ones. The properties of new-phase nuclei near the boundary of attainable superheating are discussed. The kinetics of initiated and heterogeneous nucleation is considered. The experimental data on detection of quantum tunneling of nuclei are presented. The experimental data are compared with the theories of thermal and quantum nucleation. © 2013 AIP Publishing LLC. Source

Baidakov V.G.,RAS Institute of Thermal Physics | Kozlova Z.R.,RAS Institute of Thermal Physics
Chemical Physics Letters | Year: 2010

Molecular-dynamics computer simulation has been used to calculate the self-diffusion coefficient of a Lennard-Jones fluid in the interval of reduced temperatures T = 0.35-2.0, through mean-squared particles displacements and the velocity autocorrelation function. Calculations have been performed for systems in stable and metastable states up to the boundary of spontaneous nucleation in a model of a fluid consisting of 2048 particles. The values of the self-diffusion coefficient on the spinodals of a superheated liquid and supersaturated vapor have been determined. It has been established that in the region of supercooled states of the liquid phase on an isotherm the logarithm of the self-diffusion coefficient is a linear function of the pressure. © 2010 Elsevier B.V. All rights reserved. Source

Pavlov P.A.,RAS Institute of Thermal Physics | Skripov P.V.,RAS Institute of Thermal Physics
International Journal of Thermophysics | Year: 2014

This paper studies the phenomenon of spontaneous boiling-up of polymeric liquids on heating at rates (T)up to 107 K·s−1. A model of the thermal equation of state for (polymer + monomer) systems and a procedure for determination of the spontaneous boiling-up temperature T* for polymeric liquids, taking decomposition into account, are proposed. The experimental data on T* for a number of polymer melts are compared with results calculated from the model. © 1999, Plenum Publishing Corporation. Source

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