Computational Methodologies and Potentials for Phase Equilibria

These pages provide links to computational methodologies and intermolecular potentials for simulation-based calculations of the phase behavior of fluids developed at Cornell and Maryland in the late 1990's.

Intermolecular Potential Models Developed or Tested

System Potential Description Literature Citation
O2 , N2 2-site LJ 12-6 Unpublished data of P. Baranello, Cornell U. (1997).
Cl2 , F2 2-site LJ 12-6 Galassi and Tildesley, Molecular Simulation, 13, 11-24 (1994).
CO2 3-site LJ 12-6 + partial charges EMP2 potential of Harris and Yung, J. Phys. Chem. 99, 12021 (1995)
CH3OH 3-site LJ 12-6 + partial charges Haughney et al., J. Phys. Chem., 91, 4934 (1987)
van Leeuwen and Smit., J. Phys. Chem., 99, 1831 (1995).
H2O Exp-6 + partial charges J.R. Errington and A.Z. Panagiotopoulos, J. Phys. Chem. B, 102, 7470 - 75 (1998).
n-alkanes Exp-6, united atom J.R. Errington and A.Z. Panagiotopoulos, J. Phys. Chem. B., 103, 6314-22 (1999).
benzene and cyclohexane Exp-6, united atom J.R. Errington and A.Z. Panagiotopoulos, J. Chem. Phys.., accepted for publication (1999).
H2O + (CH4 or C2H6) SPC/E + TRAPPE J.R. Errington, G.C. Boulougouris, I.G. Economou, A.Z. Panagiotopoulos and D.N. Theodorou, J. Phys. Chem. B, 102, 8865-73 (1998).
n-C5H12+CH4, C2H6+CO2, C3H8+CO2, n-C5H12+CO2, H2O+C2H6 , CH3OH+n-C6H14, CH3OH + CO2 Exp-6, + partial charges J.J. Potoff, J.R. Errington and A.Z. Panagiotopoulos, Molec. Phys., accepted for publication (1999).

Computational Methodologies

Gibbs Ensemble MC Simulation in two regions for quick calculation of phase behavior; moderate accuracy
Grand Canonical MC Simulations in the µ1µ2...VT ensemble; produces histograms of (N1,N2,..E)
Data analysis programs for GCMC Processing of histograms to obtain the equation of state, phase behavior and critical points

Last modified: 01/29/09