CONVECTIVE AND RADIANT HEAT TRANSFER ON INTERNAL SURFACES OF THE OUTER CORNER

Abstract

Statement of the problem. The heat transfer processes in the area of the corners of the outer wall structures differ from the ones taking place along the surface of a wall. However, in the numerical simulation of these processes in the zone of outer corners, as a rule, the same values of heat transfer coefficients are taken as at the inner surface of the outer wall. As a result, the actual temperature at the edge of the inner corner is lower than the calculated one. In these cases, when the temperature is below the dew point, conditions are created for the formation of condensate and dampness of the inner surface of the wall. Therefore, it is necessary to conduct research to establish a scientifically substantiated calculated value of the heat transfer coefficient at the inner surface of the outer corner. Results. To solve this problem, we carried out a theoretical study of convective and radiant heat transfer using experimental data. Based on the solution of criterial equations and dependences of the Nusselt number on the Grashof and Prandtl criteria, we established the numerical values of the coefficients of convective heat transfer on the face of the inner surface of the outer corner. Theoretical studies of radiant heat transfer, taking into account the angular coefficient of radiant energy transfer, made it possible to obtain the coefficients of radiant heat transfer on the face of the inner surface of the outer corner. Conclusions. As a result of the study, we obtained scientifically substantiated numerical values of the heat transfer coefficients at the inner surface of the outer corner, which should be used in mathematical modeling of heat transfer through the outer walls in the area of the inner surface of the corner when calculating temperature fields.