Deposition of particles towards the wall from a turbulent dispersed ¯ow in a vertical pipe has been studied numerically. A fully developed turbulent pipe ¯ow of air is chosen as the primary ¯ow, and it is represented by the law-of-the-wall relations and the average turbulence statistics obtained from a direct numerical simulation reported in the literature. Trajectories and velocities of the particles are calculated, using a one-way coupling Lagrangian eddy±particle interaction model. Thousands of individual particles (typically 920 kg/m 3 in density) of various diameters (2.0±68.5 lm) are released in the represented ¯ow, and deposition velocities are evaluated. It is shown that the deposition velocities predicted are in good agreement with experimental data available in the literature. The in¯uence of some forces in the particle equation of motion (i.e., the Saman lift force, the centrifugal force, the conservation of angular momentum and the buoyancy force) on the prediction of the deposition velocities is examined. Also examined is the in¯uence of the inlet particle concentration pro®le, on which little attention has been paid so far. The unique phenomenon of Ônear-wall build-upÕ of small particles, which has been reported in some previous simulations and experiments, was also observed in the present simulation while the result for very small particles (s p `3) should be accepted with reservation due to their possible spurious build-up associated with the random-walk approach.