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Thermodynamics
Published in Yeong Koo Yeo, Chemical Engineering Computation with MATLAB®, 2020
The van Laar equation is frequently used to correlate activity coefficient data for non-ideal systems. The van Laar equations for the correlation of binary activity coefficients are given by26logγ1=Ax22(ABx1+x2)2,logγ2=Bx12(x1+BAx2)2where parameters A, and B, constants for a particular binary mixture, may be determined using experimental data.
Filling Data Gaps by Correlation and Prediction
Published in David A. Palmer, Handbook of Applied Thermodynamics, 2019
An equation which assumes symmetrical activity coefficient curves is GE = Ax,x2. It is unsatisfactory for most purposes. Two-parameter equations were therefore developed, going back to the turn of the century. They were simply algebraic expansions. Illustrative of these equations were the Wohl expansions and the derived or related equations of Margules, Van Laar, Redlich-Kister, and others. The Van Laar equation was derived from the van der Waals EOS. Perhaps demonstrating the inadequacies of that equation, it only works when the parameters are allowed to vary to fit the data. The Van Laar equation is as follows.
Development of novel phase change materials based on methyl laurate and fatty acids for low-temperature applications
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2023
Zifeng Ma, Kai Yue, Zhihan Yao, Xinxin Zhang
The Schroder – Van Laar equation was derived according to the second law of thermodynamics and phase equilibrium theory. The eutectic composition, melting point, and latent heat of eutectic mixtures were theoretically calculated for the design and preparation with the Schroder – Van Laar equation, as shown in Eq.. (1) (Zhang, Su, and Ge 1995).