Due to the distinct differences in size, density or shape of the particles' physical properties, the pattern of the two solid phases is complex. The hydrodynamics of binary mixtures of Geldart A particles and Geldart D particles in gas-solid fluidized bed, particularly the radial flow behaviors, are investigated. By comparing relative solid holdup, it is found that Geldart D particles tend to accumulate near the wall. However, few studies have discussed the occurrence for this phenomenon. The Kutta-Joukowski transverse force is introduced to analyze the distribution characteristics of local density and the local fractions of binary particles in the radial direction from the viewpoint of the forces on particles. Considering the fact that non-uniform structures in intermediate scale, the Eulerian-Eulerian multi-fluid model as well as the drag force model based on the energy minimization multi-scale (EMMS) is used. The Kutta-Joukowski transverse force on particles presents a non-uniform distribution in the radial direction. It is related to the gas-solid velocity-difference vector and the particle velocity radial gradient. Based on the radial profile of the Kutta-Joukowski transverse force, the flow regime is divided into three zones, the Kutta-Joukowski uniform influence zone (zone I), the velocity gradient dominant zone (zone II), and the velocity-difference vector dominant zone (zone III). The results show that the Geldart A particles and Geldart D particles exhibit similar tendencies in zone I to move towards the wall, resulting in a uniform distribution. In zone II and III, both Geldart A particles and Geldart D particles are exerted by the Kutta-Joukowski transverse force towards the wall, leading to a core-annulus phenomenon with low concentration at the center and high concentration near the wall. Compared to Geldart A particles, relatively higher Kutta-Joukowski transverse force on Geldart D particles results in a stronger tendency to move towards the wall region in zone II. In zone III, on the other hand, the tendencies for Geldart A particles and Geldart D particles travelling towards the wall are relatively weak.