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Journal of Non-Equilibrium Thermodynamics

Founded by Keller, Jürgen U.

Editor-in-Chief: Hoffmann, Karl Heinz

Managing Editor: Prehl, Janett / Schwalbe, Karsten

Ed. by Michaelides, Efstathios E. / Rubi, J. Miguel

4 Issues per year


IMPACT FACTOR 2016: 1.714

CiteScore 2016: 1.38

SCImago Journal Rank (SJR) 2016: 0.402
Source Normalized Impact per Paper (SNIP) 2016: 0.886

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1437-4358
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Volume 41, Issue 1 (Jan 2016)

Issues

Deriving properties of low-volatile substances from isothermal evaporation curves

Ricardas V. Ralys
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  • Department of Information Technologies in the Fuel and Energy Complex, ITMO University, 49 Kronverksky Pr., St. Petersburg 197101, Russia
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/ Alexander A. Uspenskiy
  • Department of Information Technologies in the Fuel and Energy Complex, ITMO University, 49 Kronverksky Pr., St. Petersburg 197101, Russia
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/ Alexander A. Slobodov
  • Department of Information Technologies in the Fuel and Energy Complex, ITMO University, 49 Kronverksky Pr., St. Petersburg 197101, Russia
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Published Online: 2015-12-15 | DOI: https://doi.org/10.1515/jnet-2015-0030

Abstract

Mass flux occurring when a substance evaporates from an open surface is proportional to its saturated vapor pressure at a given temperature. The proportionality coefficient that relates this flux to the vapor pressure shows how far a system is from equilibrium and is called the accommodation coefficient. Under vacuum, when a system deviates from equilibrium to the greatest extent possible, the accommodation coefficient equals unity. Under finite pressure, however, the accommodation coefficient is no longer equal to unity, and in fact, it is much less than unity. In this article, we consider the isothermal evaporation or sublimation of low-volatile individual substances under conditions of thermogravimetric analysis, when the external pressure of the purging gas is equal to the atmospheric pressure and the purging gas rate varies. When properly treated, the dependence of sample mass over time provides us with various information on the properties of the examined compound, such as saturated vapor pressure, diffusion coefficient, and density of the condensed (liquid or solid) phase at the temperature of experiment. We propose here the model describing the accommodation coefficient as a function of both substance properties and experimental conditions. This model gives the final expression for evaporation rate, and thus for mass dependence over time, with approximation parameters resulting in the properties being sought.

Keywords: Saturated vapor pressure; thermogravimetry; evaporation rate; diffusion

About the article

Received: 2015-05-31

Revised: 2015-10-08

Accepted: 2015-10-19

Published Online: 2015-12-15

Published in Print: 2016-01-01


Citation Information: Journal of Non-Equilibrium Thermodynamics, ISSN (Online) 1437-4358, ISSN (Print) 0340-0204, DOI: https://doi.org/10.1515/jnet-2015-0030.

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[1]
A B Uspensky, R Ralys, D Kremnev, M Radin, and A Slobodov
IOP Conference Series: Materials Science and Engineering, 2017, Volume 175, Page 012024

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