Дослідження теплофізичних процесів у насіннєвій масі під впливом електричного поля високої напруженості
Abstract
INVESTIGATIONS OF TEMPERATURE PROCESSES OCCURRING IN A SEED MASS UNDER THE INFLUENCE OF A HIGH ELECTRIC FIELD
S. Usenko, O. Naumenko, O. Melnyk
The results of investigations of temperature processes occurring in a seed mass under the influence of a high electric field. It is established excess temperature dependence of grain over the ambient temperature depending on the time of processing and power density released in the grain mass during processing.
Electric fields of high intensity is one of the most promising means of influence on seed crops. One of the directions of use of electric fields of high intensity is preplant treatment of seeds in order to stimulate growth processes.
An important part of pre-treatment of seeds in an electric field of high intensity is changing its temperature during processing. In addition, we know that the basic seed dormancy can be broken by its heat. For example, for barley, it is 40 - 50 °C. It is believed that the increased temperature causes oxidation inhibitors germination. When current passes during processing temperature seed mixture will increase by Joule-Lenz.
The purpose of research - the study of thermal processes occurring in seed weight under an electric field of high tension.
It was developed a laboratory setting to investigate the thermal processes in seed weight in the department of electric and electrotechnologies National University of Life and Environmental Sciences of Ukraine.
During the studies measured the electric field in the grain mass, density of current passing through the grain, specific power released in the grain mass and temperature of grain and grain temperature in excess of the ambient temperature. The experiments were conducted in a threefold repetition.
Dynamics of heat is linear. A temperature dependence of excess grain on the ambient temperature of the power density released in the grain mass is nonlinear. This can be explained, examined the process of heating the grain mass in the electrical field.
As a result, the energy heats the grain. With increasing grain temperature increases the value of its conductivity, and therefore power density released in the grain. This leads to further heating of the grain, which increases the value of specific conductivity and power density. This process will continue to the temperature at which the heat loss through the walls of the chamber equal treatment with heat in the grain mass, or the occurrence of electrical breakdown in the grain mass.
Established that the initial values of specific capacity of processing 8883...11190 W/m3 and the electric field of 5.33 kV/cm grain temperature for the duration of treatment of 15 minutes increased by 7.3 degrees respectively, 30 minutes - 10.7 degrees respectively, 40 min - 16.5 degrees respectively. If the duration of data processing seeds dynamics heating barley seed mass has a linear relationship.
References
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