LIQUID-VAPOUR PHASE EQUILIBRIUM IN CESIUM: A DISSIPATIVE PARTICLE DYNAMICS SIMULATION STUDY

The properties of the liquid alkali metals are of great interest both because of their engineering applications and because of their fundamental importance. It is known that simple pair potentials, such as the Lennard-Jones potential, are inadequate in describing physical properties of liquid metals. In this work the Many-body dissipative particle dynamics simulation (MBDPD) method has been used to calculate densities of liquid and gaseous cesium. The parameters of the many-body potential, in which the repulsive and attractive branches depend on the local density, are fitted against the experimental radial distribution functions. This potential is then employed to calculate the Densities of liquid and vapor cesium over a wide range of temperatures and pressures, varying from the vicinity of the freezing point up to the critical point. Our results for coexisting densities show a good agreement with experiment.