STUDY OF THE CAUSE OF THE QUASICAPILLARY EFFECT IN THE STATIONARY BREEDING GRAIN LAYER
The reason for the presence of the quasicapillary effect or its absence in narrow tubes is associated with the structure of the granular layer and, as a consequence, with the value of its average void volume fraction. Particles of various shapes and roughness: glass, alundum and corundum were used to determine the fraction of the void volume as a solid phase. The granular material was poured into glass tubes with a height of 215 mm from the same height without vibration. The average fraction of the void volume of a fixed granular layer in tubes, the ratio of the inner diameter of which to the diameter of the particles is in the range of 1 - 25 are investigated. No clear dependence of the value of the average fraction of the void volume of the layer of particles on the internal size of the tube was found. It was found that the reason for the dispersed medium (a mixture of air and solid particles) to move without additional energy consumption up the tube, lowered into a stationary blown granular layer, is associated with an increased fraction of the void volume of the layer at a distance of one to one and a half grain diameters from the tube wall. It was found that the larger the fraction of the tube section is occupied by a layer with an increased fraction of the void volume, that is, has a lower resistance, the higher the dispersed medium in the tube rises.It was found that the larger the fraction of the tube section is occupied by a layer with an increased fraction of the void volume, that is, has a lower resistance, the higher the dispersed medium in the tube rises. A possible solution is proposed for intensifying the drying process of grain crops by placing a bundle of pipes with a certain ratio of their diameter to grain size in a dense layer of grains blown through by a heat carrier. The surface of the grains, due to intensive gushing due to chaotic displacement, will actively contact the coolant, which will lead to an acceleration and a more uniform drying process.