· Técnicas de simulación avanzadas ·
R Cuesta, A Delgado, J A Maroto, D Mozo
Foundation for the Research and Development in Transport and Energy, CIDAUT, Spain.
67th World Foundry Congress
In aluminium casting processes, the entrainment of surface oxides into the
bulk of liquid metal during mould filling determines a severe reduction of
the strength of the cast part. In order to avoid this, melt velocity must be
kept below a certain value, namely critical velocity, which is widely
assumed to be equal to 0.5 m/s. In this paper we investigate, by means of
computer simulation, the dependence of the critical velocity for pure
aluminium with geometrical features of running channels, such as size and
shape. The critical velocity is found to decrease with size for flat channels.
Round channels seem to have larger values of critical velocity than flat
ones. The variations in critical velocity are explained because of variations
in the Webber number of the liquid metal flow.
