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Particle transport and deposition in a channel flow with elliptic obstruction is studied. Numerical simulation of fluid flow is performed using two-dimensional lattice Boltzmann method, while one-way coupling Lagrangian method for particle tracking is used. Standard particles are injected in the inlet of the channel. Gravity, Drag force, Brownian forces, and the Saffman lift are considered in equation of particle motion. The influence of geometrical parameter, ellipse aspect ratio, is studied on dispersion and deposition of particles as well as the flow parameters, such as Reynolds number. In addition, the effect of particles size -particles of 0.01-10μm in diameter- on dispersion and deposition patterns is studied. Results reveal more inertial and gravitational trapping on obstacle surface for particles of larger diameter and obstacles of higher aspect ratio. In addition, the Brownian diffusion and the vortexes formed behind the obstacle, which occurs in high Reynolds numbers, dominantly affect finer particles trajectories.