Phase equilibria molecular simulations of hydrogen hydrates via the direct phase coexistence approach
Vasileios K. Michalis, Ioannis G. Economou, A. K. Stubos, Ioannis N. Tsimpanogiannis
Abstract
We report the three-phase (hydrate-liquid water-vapor) equilibrium conditions of the hydrogen-water binary system calculated with molecular dynamics simulations via the direct phase coexistence approach. A significant improvement of ∼10.5 K is obtained in the current study, over earlier simulation attempts, by using a combination of modifications related to the hydrogen model that include (i) hydrogen Lennard-Jones parameters that are a function of temperature and (ii) the water-guest energy interaction parameters optimized further by using the Lorentz-Berthelot combining rules, based on an improved description of the solubility of hydrogen in water.
Topics & Concepts
SolubilityMolecular dynamicsThermodynamicsHydrogenPhase (matter)HydrateLiquid waterPhase equilibriumBinary numberClathrate hydrateChemistryChemical physicsStatistical physicsPhysical chemistryComputational chemistryPhysicsOrganic chemistryMathematicsArithmeticMethane Hydrates and Related PhenomenaQuantum, superfluid, helium dynamicsSpacecraft and Cryogenic Technologies