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Flow visualization in quarter and eight scale water/olive oil mould models at Imperial College showed that transient and asymmetric flow behaviour in the mould is related with the interfacial wave characteristics. A greater waviness caused more frequent entrainment of air or the floating layer respectively. A digital image processing system was developed to measure interfacial wave heights which were complemented by laser Doppler anemometer measurement to simultaneously determine the associated horizontal velocity component, called wave pushing velocity, just upstream of an internal wave trough.

Research at Imperial College has identified a criterion, which characterizes the propensity of entrainment of the floating slag layer into the lower molten steel. The proposed criterion is that entrainment occurs when the instantaneous value of the Weber number exceeds a critical value. Experiments have shown that, if the number is based on instantaneous wave heights at a normalized horizontal (x) position of x/(L/2) = - 0.55 and associated simultaneously obtained wave pushing velocities, measured at a normalized distance of about y/(L/2) = 0.02 below the calm meniscus, the critical value of the instantaneous Weber number is: We(c) > 21

The criterion has been designed to be immediately useful by being applicable, as a post-processing criterion, to the output from commercially available CFD models of the continuous casting

Additional information

Authors: HASSALL G J, British Steel Teesside Laboratories, Middlesbrough (GB);DE SANTIS M, Centro Sviluppo Materiali, Rome (IT);LODIN B, Det Danske Stalvalsevaerk, Frederiksvaerk (DK);TAYLOR A M K P, Imperial College, London (GB);GARDIN P, Institute de Recherches de la Siderurgie Francaise, Maizieres-les-Metz (FR);ANDRZEJEWSKI P, Krupp Hoesch Stahl AG, Dortmund (DE);TACKE K H, Max-Planck-Institut fur Eisenforschung, Dusseldorf (DE);BERGELES G, National Technical University, Athens (GR);RFDL S, Betriebforschungsinstitut, Dusseldorf (DE)
Bibliographic Reference: EUR 19853 EN (2001), pp. 250. Euro: 38
Availability: Available from EUR-OP sales agent
ISBN: ISBN 92-894-1267-4
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