Abstract
As a result of experimental studies, a special mathematical model of raw cotton is developed. The effect of density change on the thermal conductivity coefficient is determined. A nonlinear differential equation of heat propagation in coils is obtained. The dependence of the density of raw cotton on the coil height is determined experimentally. The heat flux is intense propagating from denser layers of raw cotton to less dense ones. In a saturated form, the effect of density changes on the propagation of heat is less than in the coils. Pocket spontaneous heating occurs locally with sharp boundaries. An expression is found, which is the general solution of the mathematical model of heat propagation in raw cotton in coils, on the basis of which a number of physical real models can be constructed. The model allows to preliminarily give an estimation of the likely picture of the temperature field in the given microvolumes of raw cotton.
Highlights
Harvesting of raw cotton, depending on weather conditions, lasts several weeks
As a result of experimental studies it is established that the heat flux propagates from dense layers of raw cotton to less dense layers at a constant rate
A mathematical model of raw cotton is developed on the basis of experimental studies
Summary
Harvesting of raw cotton, depending on weather conditions, lasts several weeks. About 20 %of harvested raw cotton is processed by cotton ginning plants during the harvesting season, the raw cotton still have to be stored for long storage, for processing it in the months [1].When storing raw cotton with moisture above 10 % of I and II grades and 13 % for III and IV, its spontaneous heating occurs.As a result of spontaneous heating, there is a decrease in the absolutely dry mass of warming cotton. Harvesting of raw cotton, depending on weather conditions, lasts several weeks. Of harvested raw cotton is processed by cotton ginning plants during the harvesting season, the raw cotton still have to be stored for long storage, for processing it in the months [1]. When storing raw cotton with moisture above 10 % of I and II grades and 13 % for III and IV, its spontaneous heating occurs. As a result of spontaneous heating, there is a decrease in the absolutely dry mass of warming cotton. The quality of the fiber deteriorates, the breaking load decreases, resulting in the fiber grade being converted to low grades. The oil content of seeds is reduced by 50–55 % due to burnt fractions
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