The electric conductance of corn kernels fragments
2000
Hlavacova, Z. (Slovenska Polnohospodarska Univ., Nitra (Slovak Republic). Katedra Fyziky)
A knowledge of the electrical properties of grains is important from the point of view of the design and construction of electrical moisture meters for determining the moisture content, the surface level of liquid and grainy materials, for controlling the presence of pests in grain storage, for the quantitative determination of mechanical damage and in many other cases. This paper describes the volt-ampere characteristics of various corn kernels fragments. It was found that the value of current tends to achieve its conduction component after 2 minutes and the current was therefore read after this time. The current was measured during a rise and fall in voltage in order to eliminate the influence of charging and discharging currents. The regression line for volt-ampere characteristic for corn grit was of linear character and those for other corn fragments were of power character. It was concluded that the resistance and impedance of corn kernels fragments decreased with the voltage and the moisture content. The opposite occured for the electric conductance. The exponential regression line for corn grit increased sharply with the moisture content whilst the regression lines for other fragments increased slowly. The variation of grain fragments size affected a change in bulk density and conductance
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