Computer calculations of two-dimensional gas-particle flow through a separator which consists of four rows of U-beam elements show that particles coarser than 100 mu m are fully separated in the first two rows, particles with dimensions 30-80 mu m have better separation in the 3rd and 4th rows, but with less total efficiency. The design of U-beam separators influences the pressure drop more than the separation efficiency. The pressure drop increases with an increase of particle concentration in the flow. Visual observation using a liquid model confirms the general results of the calculations and shows the swirl in the cavities of the U-beam elements (primarily in the first two rows).