Gibbs ensemble simulation of the vapour-liquid equilibrium of square well spherocylinders

Gibbs ensemble Monte Carlo simulations have been performed for systems of s quare-well spherocylinders of different length-to-breadth ratio. The result s are used to test a recent perturbation theory proposed for this kind of s ystem. In addition, the results are compared to similar simulations perform ed for a Kihara fluid of elongated molecules. An unexpected good agreement is found for the coexistence thermodynamic and structural properties of bot h model fluids, hence suggesting that the hard spherocylinder plus square-w ell interaction should be considered as a reference potential for a perturb ative treatment of more complex fluid models.