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Thermodynamics of flat thin liquid films
Author(s) -
Myint Philip C.,
Firoozabadi Abbas
Publication year - 2015
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14963
Subject(s) - gibbs free energy , work (physics) , thermodynamics , ambiguity , volume (thermodynamics) , thin film , chemistry , thermodynamic equilibrium , expression (computer science) , theme (computing) , statistical physics , materials science , physics , computer science , nanotechnology , programming language , operating system
The two main themes of this study aim to resolve conflicting results in the literature regarding the thermodynamics of flat (uniform thickness) thin liquid films. One of the themes concerns the augmented Young equation, which is a condition for mechanical equilibrium. Two different expressions for the augmented Young equation have appeared in the literature. It is shown that under certain assumptions, the two expressions can be made equivalent. The second main theme addresses thermodynamic functions describing systems with non‐pressure‐volume (non‐ PV ) work. In thin liquid films, the non‐ PV work is the film tension work. Two different expressions that relate the film's Gibbs energy to its internal energy have appeared in the literature. This ambiguity is resolved by showing that only one of the Gibbs energies can be used to determine the equilibrium state via energy minimization. The analysis can be readily generalized to systems with other types of non‐ PV work. © 2015 American Institute of Chemical Engineers AIChE J , 61: 3104–3115, 2015