A New Experimental Design to Study the Kinetics of Solid Dissolution into Liquids at Elevated Temperature

摘要

A new method was developed to study the dissolution of solid cylinder in liquid under forcedconvection at elevated temperature. In the new design, a rotating cylinder was placedconcentrically in a container fabricated by boring four holes into a blank materials for creatingan internal volume with a quatrefoil profile. A strong flow in radial direction in the liquid wascreated, which was evidently shown by computational fluid dynamic (CFD) calculations andexperiments at both room temperature and elevated temperature. The new setup was able tofreeze the sample as it was at experimental temperature especially the interface between thesolid and the liquid. This freezing was necessary to obtain reliable information forunderstanding the reaction mechanism. This was exemplified by the study of dissolution ofrefractory in liquid slag. The absence of flow in radial direction in the traditional setup using asymmetrical cylinder was also discussed. The difference in the findings by different worksusing the symmetrical cylinder was found to be mostly due to the extent of misalignment of therod in the cylinder.