Abstract: In this work we investigate numerically the pneumatic transport in a horizontal tube. Our modelling is implemented using the open-source code MFIX. For the code, the gas and solid phases are treated as inter-penetrating continua in an Eulerian framework Then, the locally-averaged (continuum) mass, momentum and energy balance, are solved using a modified version of the SIMPLE method. Here, we explore the effect of different parameters from hydrodynamics on the pneumatic transport results: drag relationship between the two phases, method of solution for the solids granular energy, solids stress models, gas-phase turbulence, collisional and frictional coefficients. Towards validation of our modelling, the results are compared with a set of pneumatic transport experimental correlation data from the literature. The degree of accordance points to the better hydrodynamic model to be used.