On estimating self-diffusivities by the extended corresponding states principle

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• 作者：Octavio Suarez-Iglesias ; Ignacio Medina ; ^{medina@uniovi.es" class="auth_mail} ; Susana Luque ; Consuelo Pizarro ; Julio L. Bueno
• 关键词：Corresponding states principle ; Helmholtz residual energy ; Equation of state ; Self-diffusion ; Shape factor ; Modified Enskog theory
• 刊名：Chemical Engineering Science
• 出版年：28 April, 2014
• 年：2014
• 卷：108
• 期：Complete
• 页码：134-153
• 全文大小：1423 K

文摘

The ability of the extended corresponding states principle (ECSP) to predict the self-diffusion coefficients of several types of fluids has been studied. Two versions of the model were compared with the traditional two-parameter corresponding states principle (where the equilibrium shape factors are set to unity): one using the equilibrium shape factors and another one that additionally introduces a correction based on the modified Enskog theory (MET). Ethane was chosen as a reference fluid and the experimental database comprises 3163 points from 37 substances (polar, non-polar and hydrogen-bonding ones). Results show that a third complementary parameter, generated from diffusion data, is necessary to accurately correlate this transport property.