The latent heat of confined fluids calculated from the Clausius-Clapeyron equation

Monte Carlo simulations of simple Lennard Jones fluids confined in different geometries, sphere, cylinder and slit-like pores are conducted to study the vapour-liquid transition. Phase diagrams, in the temperature-density (T-ρ) and pressure-temperature (P-T) are obtained. For each geometry the coexistence lines are plotted from the clapeyron equation of each systems and a P −T equation is proposed in terms of the critical temperature which works for all the systems. Additionally, the transition latent heat is also evaluated, from the enthalpy calculation obtained directly from the simulation data, and the fluid structure from density profiles.