Marangoni flows and the erosion of ceramic crucibles
Flux line erosion is a serious problem in the pyrometallurgical and glass-making industries. Scouring or erosion of the refractory crucible occurs in the areas close to the metal/slag or glass/flux interface. The shape of the attack profile depends on the chemistry of the refractory and molten phases. In this paper, the phenomenon is modelled using an interfacial hydrodynamics approach assuming that it originates from buoyancy and Marangoni convective flows. The relative contributions of the capillarity gradient at the phase interface and of the buoyancy flow to the determination of the shape and rate of formation of the erosion profile are calculated. It is deduced that the Marangoni flow is typically the dominant process. It is noted that the extent of the erosion may eventually be controlled by manipulating factors such as the composition of the refractory wall in relation to the chemistry of the fluid phases and by experimenting with additive species in order to neutralise highly surface-active impurities.
Bibliographic Reference: Article: Naturwissenschaften, Vol. 79 (1992) pp. 314-317
Record Number: 199211192 / Last updated on: 1994-11-29
Original language: en
Available languages: en