HEAT-TRANSFER AND MELTING CHARACTERISTICS OF METALLIZED WUSTITE PELLETS

The melting procedure of the metallized wustite pellet under Ar atmosp here was examined in this work. The temperature at the center and surf ace of the pellet was measured during pellet heating from 200 to 1550- degrees-C. The variation of the pellet shape and the movement of melti ng interface were continuously monitored by means of an X-ray image sy stem during pellet melting. The adoption of digital image processing m ade a significant accuracy improvement of the X-ray image analysis com pared with the previous works. On the basis of experimental results, a modified unit cell model was built for describing the internal struct ure and the effective thermal conductivity of the metallized porous pe llet. The calculated results based on the model agreed well with the e xperimental ones.