Study of the relationship between the dielectric permittivity of the pellet mass and the pellet size

Abstract

   The pellet size can be determined without stopping the shell build-up by the dielectric permittivity of the pellet mass. To confi rm this hypothesis, mathematical expressions describing the relationships between the amount of materials of the pellet shell, pelleted objects and air have been compiled and analysed. During theoretical study of the shell build-up, assumptions were made on simultaneous increase in diameter of the pellet objects and on spherical shape of the formed pellets. The authors made calculations using the example of flat electrodes with the pellet mass placed between them. The pellet mass is treated as a material substance that fills the space between the electrodes and has a variable dielectric permittivity. It was found that increasing the pellet size leads to a decrease in the dielectric permittivity of the pelleted object structure. The dielectric permittivity of the medium is proved to be a function of the object diameter that depends on the number of objects between the plates. The identifi ed relationship was used to obtain information about the shell build-up in a continuous mode. Under production conditions, the dielectric permittivity of the pellet mass may be measured by the value of alternating electric current flowing through the medium under analysis.