Beschreibung:
<jats:p>In the chemical, pharmaceutical and food-processing industries, the drying operation is a major intermediate step in the production of finished or semi-finished products. 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 is the homogeneous distribution of the drying air, made possible by dihedrons, a special device for introducing the air. The basis tool for dimension, a drier with immersed channels, is the control of the dehydration of the product, and the distribution function residence time of the particles inside the column. In the present study, a model and thus an indirect measurement of dispersion coefficients of solids were proposed in contrast with previous studies where the variation of dispersion coefficient has often been disregarded in the granular flow models. The comparison of calculations with measurements gave an indirect measurement of the longitudinal and transversal variable coefficients as a function of the position in the column. It is concluded that it is necessary to account for the variation of dispersion coefficients during the granular flow in the column to obtain a correct description of their flow. It is worth noting that this indirect measurement proves that the transversal dispersion coefficient varied much more than the longitudinal one.</jats:p>