The Computational Fluid Dynamics (CFD) tool pafiX (particle flow simulation in explosion protection) focuses on modeling the electrostatic charging of particle-laden flows. In CFD simulations of two-phase flows, accurate drag force modeling is essential for predicting particle dynamics. However, since all existing drag correlations were established for specific flow situations, a generally valid formulation is lacking. In particular, these correlations have not been evaluated for particle-laden flows subjected to electrostatic forces. This thesis reports on the effect of drag force modeling on the flow of electrically charged particles. To this end, we implemented different drag correlations in pafiX. Then, we performed highly-resolved Direct Numerical Simulations (DNS) using a Eulerian-Lagrangian approach of a particle-laden channel flow of a friction Reynolds number of 180. The simulations generally revealed a strong influence of the precise drag correlation on particles in the near-wall region and a minor effect on the particles far from the walls. Due to their turbophoretic drift, particles accumulate close to the channel walls. For uncharged particles, the simulations show large deviations of the particle concentration profile in the near-wall region depending on the drag force correlation. Therefore, the disturbance of the flow surrounding a particle by a nearby wall or other particles is important for its drag. Driven by electrostatic forces, charged particles accumulate even closer to the wall. Contrary to the uncharged cases, when the particles carry a high charge (in our case one femto-coulomb), we found minor effects of a nearby wall and nearby particles on the drag force. In conclusion, for the investigated conditions, we propose to account for the effect of nearby particles and walls on the drag of charged and uncharged particles.