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Estimation of surface tension of pure fluids using the gradient theory

✍ Scribed by Juán H. Pérez-López; Luis J. González-Ortiz; Miguel A. Leiva; Jorge E. Puig

Publisher
American Institute of Chemical Engineers
Year
1992
Tongue
English
Weight
580 KB
Volume
38
Category
Article
ISSN
0001-1541

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✦ Synopsis

The modvied van der Waals theory of interfaces (gradient theory) is used with the equations of state of Peng-Robinson and Mohanty-Davis to predict surface tensions of various nonpolar, quadrupolar, slightly polar and polar substances as a function of temperature. The influence parameter of the gradient theory is estimated as 0. 785ab2I3 in terms of the attractive and repulsive van der Waalsparameters using the Lennard-Jones potential. The predictions made with the Mohanty-Davis equation of state agree better with experimental data than those made with Peng-Robinson, even for nonpolar fluids.

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Surface tension prediction for pure flui
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✍ Joel Escobedo; G. Ali Mansoori 📂 Article 📅 1996 🏛 American Institute of Chemical Engineers 🌐 English ⚖ 896 KB

For the surface tension of otganic compounds, (+ = [ 6 -( p , -p,)I4 is proposed where 6 = 6,.(1-T,)0.37.T,.exp(0.30066/T, + 0.86442.T:). p! and pu are molar densities of liquid and vapor, respective&, T, = T/T,, and CP, is a temperature-independent, compound-dependent constant similar to Sugden ' s