The purpose of the present paper is the theoretical study of the behaviour of particles conveyed by a gaseous jet onto a flat surface. The calculations of the trajectories of the particle are made by a Lagrangian approach by means of a simplified hypothesis on the velocity field of the gas. The model shows that the particles undergo a first collision on the surface followed by successive rebounds before final settling. The trajectories are studied as a function of operating conditions. The values of the settling locations of the particles are compared finally with results derived from two different experimental approaches. A good quantitative agreement is observed.