Phase equilibria and metastable states

Skripov, V. P.

doi:10.1007/bf00871095

Cited by 8 publications

(14 citation statements)

References 4 publications

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“…It allows conduction of a series of comparative experiments in a wide range of temperature and heating rate (to 10 5 K/s) in identical heating conditions, regardless of the properties and phase transitions in the specimen. The high speed of the technique enables measurements in the region of essentially superheated (relative to the liquid-vapor equilibrium temperature of the base liquid [9][10][11]) states of substance.…”

Section: Choosing the Approachmentioning

confidence: 99%

Apparatus for studying heat transfer in nanofluids under high-power heating

Rutin

Скрипов

2012

J. Engin. Thermophys.

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A technique of electronic control of the probe heating power is developed using the method of controlled pulse heating of a wire probe, that is a resistance thermometer, was developed. An apparatus implementing this technique was fabricated. The characteristic parameters of the apparatus are as follows: the heating pulse length, 1 to 10 ms; the heat flux density through the surface of a 20 μm probe, 1 to 10 MW/m 2 ; repeatability of selected power value in a series of pulses is on a level of 0.05%. As an example, the constant heating power mode is applied for comparing the thermal resistance of nanofluids in the region of stable states of liquid and superheated (with respect to the liquid-vapor equilibrium temperature of the base liquid) ones. The parameter was the content of Al 2 O 3 nanoparticles in the base liquid (isopropanol).

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Section: Choosing the Approachmentioning

confidence: 99%

Apparatus for studying heat transfer in nanofluids under high-power heating

Rutin

Скрипов

2012

J. Engin. Thermophys.

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“…Standard reference table for platinum thermometers is implemented for resistance-to-temperature conversio n. A relative version of the method was applied. Probe calibration verification is carried out by the temperature of attainable superheat measure ments [1][2][3] for saturated hydrocarbons at a pressure 0.95 p c , where p c is the thermodynam ic critical pressure .…”

Section: Methodsmentioning

confidence: 99%

“…We shall use the term ''short-liv ed'' to refer to fluids that lose their stability in the course of heating, namely, superhea ted (with respect to the liquid-vapor equilibrium temperature and/or the temperature of thermal decomposition onset) liquids. Because of the obvious experime ntal difficulties, the properties of such liquids remain poorly known so far [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer under high-power heating of liquids. 1. Experiment and inverse algorithm

Rutin

Smotritskiy

Старостин

et al. 2013

International Journal of Heat and Mass Transfer

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a b s t r a c tA new approach to fluids behavior study in the course of highpower heating has been developed by us. The approach combines experimental method of controlled pulse heating of a wire probe and numerical method of thermoph ysical properties temperature dependencies recovery from the experimental data. Short (millisecond) characteristic time scale allows working with short-lived fluids, including superheated (with respect to the liquid-vapor equilibrium temperature and/or to the temperature of thermal decomposition onset) ones. Numerical method gives a set of inverse heat conductio n problem solutions, based on the results of single pulse experiment. Numerical technique, based on the heat transfer parameters optimization model, is built using genetic algorithms. The approach was applied to saturated hydrocarbons in the temperature range 300-625 K.

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“…Metastable states are an important branch of modern physics [1,2]. Reproducibility of experimental measurements of different physical properties of metastable materials, including amorphous and other disordered systems suggests that there is definite Gibbs free energy, a function of temperature, T 7 , and pressure, P, for each given sample.…”

Section: Introductionmentioning

confidence: 99%

Short Communication. A Model for Metastable States

Kornyushin¹

1993

Journal of Non-Equilibrium Thermodynamics

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A simple phenomenological approach for metastable states is proposed, which allows one to calculate explicit dependence of the Gibbs free energy on temperature, T. In this scheme the heat capacity (in units of Boltzmann's constant k) is at low temperatures c p -T I T 0 (T 0 is some constant) and a thermodynamic barrier, dividing metastable and unstable states is proportional to (7] -Τ) 3 ' 2 (Τι is the temperature of the absolute instability). Thermodynamic stability under conditions of mechanical loading is considered. Dependence of the thermal expansion coefficient on temperature is analysed also.The influence of a heating (cooling) rate on the measured dynamical heat capacity, c, is investigated. At low rates c = T/T 0 , at high heating rates c = T 2 /2T 0 T t τ (T t is the heating (cooling) rate, τ is a relaxation time).

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Phase equilibria and metastable states

Cited by 8 publications

References 4 publications

Apparatus for studying heat transfer in nanofluids under high-power heating

Apparatus for studying heat transfer in nanofluids under high-power heating

Heat transfer under high-power heating of liquids. 1. Experiment and inverse algorithm

Short Communication. A Model for Metastable States

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