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The article deals with the study of main hydrodynamic characteristics of the directed fluidized bed in gravitation shelf dryers. The algorithm to calculate hydrodynamic characteristics of the directed fluidized bed in the dryer’s workspace is described. Every block of algorithm has theoretical model of calculation. Principles of disperse phase motion in various areas in the gravitation shelf dryer are established. The software realization of author’s mathematic model to calculate disperse phase motion trajectory in free and constrained regime, disperse phase residence time in the dryers’s workspace, polydisperse systems classification is proposed in the study. Calculations of disperse phase motion hydrodynamic characteristics using the software product ANSYS CFX, based on the author’s mathematic model, are presented in the article. The software product enables to automatize calculation simultaneously by several optimization criteria and to visualize calculation results in the form of 3D images. The fields of the disperse phase flows velocity are obtained; principles of wide fraction of the disperse phase distribution in the workspace of the shelf dryer are fixed. The way to define of disperse phase residence time in the workspace of the shelf dryer in free (without consideration of cooperation with other particles and dryer’s elements) and constrained motion regimes is proposed in the research. The calculation results make a base for optimal choice of the gravitation shelf dryer working chamber sizes.