Self-diffusion in a fluid of square-well spheres

The self-diffusion coefficients for a dense fluid of particles interacting with a square-well potential are described. The expression for self-diffusi on coefficients obtained by the Chapman-Enskog method of solution is correc ted by the molecular dynamics simulation data. The structural data for the square-well fluid required in the calculation are obtained from explicit an alytic equations for the radial distribution function. The corrected equati on represents the self-diffusion coefficients with an average absolute devi ation of 4.63% for the square-well fluid. The results are compared with tho se of other expressions. In addition, the self-diffusion coefficients for r eal fluids composed of simple, near spherical molecules are correlated usin g the square-well potential, and acceptable agreement is obtained between t he calculated and experimental diffusion data.