STUDY OF DRYING PROCESS OF WELDING ELECTRODES BY METHOD OF MATHEMATICAL MODELING

Abstract

Based on the simplified model of mass conductivity, a mathematical model of the process of drying the welding of electrodes was investigated. The model takes into account the dewatering process in zones with constant and waning drying rate and is based on obtaining an analytical solution of the non-stationary problem of mass conductivity with boundary conditions of the third kind for drying tubular bodies of cylindrical shape. The adequacy of this mathematical model was compared with the experiments carried out by the author of the drying of the routile coating of the welding electrodes.

The mathematical model is simplified. When developing a mathematical model, the following assumptions were made: moisture evaporation from the coating ends is absent; The wet coating of the welding electrodes is a capillary-porous body, and the liquid moves freely within the porous structure; the evaporation of a liquid occurs only on the outer surface of the body, and the rate of the evaporation process is determined by the heat supplied to the surface of the body; the temperature of a wet body at any time is the same in thickness;

The model is made in polar coordinates. It was believed that the welding of electrodes is a regular geometric casing (cylinder), in which, during drying, the moisture concentration changes only in one coordinate. The boundary conditions are written in the form of boundary conditions of the third kind (in the form of equations for the return of convective mass) from the surface of the wet body to the environment.

The results of the work can be used for numerical calculation of the duration of drying of capillary-porous bodies of cylindrical shape (eg pasta) and determination of moisture content in them during the drying process