There are a great many drying processes and types of equipment, such as dryers with immersed channels; the main advantage of this type of dryer, and the reason why it is chosen by manufacturers, is the homogeneous distribution of the drying air, made possible by dihedrons. In our work, we have investigated a flow model with a random double dispersion and have finally shown that the dispersion coefficients are not constant but vary depending on the position of the granular material in the column of dihedrons.