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G-type shells in shell-and-tube heat exchangers: Gaddis, E S, Galerkin method, for heat conduction finite-element calculations, Galileo number, Gas-liquid flows: Gas-liquid-solid interfaces, fouling at, Gas-solid interfaces, fouling at, Gas tungsten arc welding, Gaseous fuels, properties of, Gases: Gaskets: Gauss-Seidel method, for solution of implicit equations, Geometric optics models for radiative heat transfer from surfaces, geothermal brines, fouling of heat exchangers by, Germany, Federal Republic of, mechanical design of heat exchangers in: Gersten, K, Girth flanges, in shell-and-tube heat exchangers, Glass production, furnaces and kilns for, Glycerol (glycerine): Gn (heat generation number), Gnielinski, V Gnielinski correlation, for heat transfer in tube banks, Gomez-Thodas method, for vapour pressure, Goodness factor, as a basis for comparison of plate fin heat exchanger surfaces, Goody narrow band model for gas radiation properties, Gorenflo correlation, for nucleate boiling, Gowenlock, R, Graetz number: Granular products, moving, heat transfer to, Graphite, density of, Grashof number Gravitational acceleration, effect in pool boiling, Gravity conveyor: Gregorig effect in enhancement of condensation, Grid baffles: Grid selection, for finite difference method, Griffin, J M, Groeneveld correlation for postdryout heat transfer, Groeneveld and Delorme correlation for postdryout heat transfer, Gross plastic deformation Group contribution parameters tables, Guerrieri and Talty correlations for forced convective heat transfer in two-phase flow, Gungor and Winterton correlation, for forced convective boiling, Gylys, J,
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Vapour Pressure, Enthalpies of Vaporisation and Boiling and Melting Points of Pure Fluids

DOI 10.1615/hedhme.a.000500

5.1 PROPERTIES OF PURE FLUIDS
5.1.3 Vapour pressures, enthalpies of vaporisation and boiling and melting points of pure fluids

A. Introduction

In this section we examine how to estimate vapour pressures, enthalpies of vaporisation and boiling and melting temperatures of pure fluids. These properties play an important role in the design and operation of many chemical and physical processes.

B. Vapour pressure

The work of Boublik et al. (1984) constitutes an excellent source of experimental data for more than 1,000 substances. Data are usually correlated as a function of temperature using either the Antoine equation or the more accurate Wagner equation. The Antoine equation is obtained from the Clapeyron equation and should only be used over the range of temperatures over which the coefficients A, B, and C have been determined. It is usually presented as:

\[\label{eq1} \ln(p/p^0)=A-\dfrac{B}{T+C}\,. \tag{1}\]

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