Open AccessTHEORETICAL JUSTIFICATION OF THE MINIMUM DROP HEIGHT OF A SPHERICAL GRAIN INTO THE DEVELOPER SOLUTION
Author(s) -
V. Sysuev,
В. Е. Саитов,
V. G. Farafonov,
А. В. Саитов,
Tat'yana Malyh
Publication year - 2020
Publication title -
vestnik kazanskogo gosudarstvennogo agrarnogo universiteta
Language(s) - English
Resource type - Journals
ISSN - 2073-0462
DOI - 10.12737/2073-0462-2020-125-132
Subject(s) - bulk density , linear density , surface tension , drop (telecommunication) , materials science , mathematics , impurity , composite material , chemistry , soil science , physics , thermodynamics , mechanical engineering , environmental science , organic chemistry , engineering , soil water
Food products made of grain are the main source of human nutrition and feed for farm animals. One of the main reserves for increasing its production is sowing with high-quality material, purified from various impurities and pathogens. To protect it from various diseases, etching is used. The most effective way to implement this technological operation is wet pickling with simultaneous release of grain impurities. For implementation of a corresponding device, an estimate was made of the minimum drop height of a weevil which is necessary to overcome the surface tension of a liquid. Pea seeds with a shape close to a sphere were used as objects of research. Therefore, a spherical caryopsis with density ρз = (1.15…1.45)∙103 kg/m3, diameter 2rз = (3.5…10.9) ∙10-3 m was taken as a model of the seed. We investigated the fall of separately taken spherical caryopses with minimum (2rзmin. = 3.5∙10-3 m), average (2rзmid. = 7.2∙10-3 m) and maximum (2rзmax. = 10.9∙10-3 m) linear dimensions having a density ρз = 1.15; 1.25; 1.35 and 1.45∙103 kg/m3, on the surface of an aqueous solution of the dressing agent with a density of ρж = 1.00; 1.03; 1.06; 1.09; 1.12 and 1.15 ∙ 103 kg/m3 with the corresponding coefficients of surface tension σ = 0.0727; 0.0755; 0.0771; 0.0786; 0.0801 and 0.0816 N/m and hydrodynamic resistance coefficients c = 0.4 (0.5 for ρж = 1.12 and 1.15 ∙ 103 kg/m3). The etching process was considered at a temperature of 20°C. The minimum drop height h for overcoming the surface tension of the dressing solution by all caryopses with physical and mechanical parameters with the indicated values should be 15.5 ∙ 10-3 m