Structure and growth of the cluster in gas-liquid transition of two-dimensional fluid

Molecular dynamics simulations have been performed for a two-dimensional fl uid with truncated Morse potential quenched into the two-phase region. The cluster size and shape were used to study the domain growth and structure. The power-law growth of the characteristic length scale, which was calculat ed through the mean cluster size, i.e., l similar to t(a) with a = 1/2 and 1/3, was observed in the late stage. The fractal dimension was obtained fro m the scaling relationship of the gyration radius of the clusters with the cluster numbers. The structure factors showed scaling relationship when sca led with the characteristic length. It is also found that the domain struct ures are sensitive to temperature, and the thermal noise influences the gro wth exponent for the dilute system. (C) 1999 Elsevier Science B.V. All righ ts reserved.