Radiation properties of radiant tube materials

摘要

In furfaces iwth radiant tubes the heat transfer mainly occurs by radiation. Emissivities of the tubes are required for heat transfer calcualtions. Emissivities of radiant tube materials depend of many surface parameters and have to be investigated experimentally. Radiant tubes are made of heat-resisting steels, heat-resisting steel castings or siliconcarbid-materials. Spectroal emissivities were measured. Out of the measured spectral emissivities the temeprature dependent total emissivities are calculated.