Application of the theory of physical similarity for the filtration of metallic melts

Abstract

The Bernoulli equation is the basis for the primary description of the flow of a real metallic melt through the pouring system for the filling of the casting mould with an inserted ceramic filter. In principle, a modified, dimensionless form of the Bernoulli equation can be used for the determination of the loss coefficient 􀀀 as a general function of the dimensionless criteria – the Reynolds, Froude and Euler numbers. It was verified by modelling the flow of the modelling liquid (in this case water) through ceramic filters. In the same interval of Reynolds numbers the loss coefficient 􀀀 was greater for foam filters than for filters with direct holes (strainers); however, the outlet coefficient μ of the foam filters was, in identical conditions, significantly lower than that of filters with direct holes.