Observations of pulsating Marangoni phenomena during the local oxidation of deoxidized liquid steel

G. R. Belton*, T. J. Evans, L. Strezov

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Studies have been made by means of a high-speed video technique of the surface of Al-Si-Mn deoxidized liquid steel at about 1600°C during local reoxidation by gently impinging flows of CO 2-containing gases. Expanding 'necklaces' of alumina oxidation product have been observed to form at frequencies of up to about 5 Hz and to travel at velocities of up to 250 mm s -1 near to the gas inlet tube, depending on the experimental conditions. The pulsation frequency appears to be controlled by the rate of diffusion of aluminium to the surface. The effects of additions of the surfactants sulphur and selenium on the velocity of the moving front are shown to be consistent with the processes being surface tension driven.

    Original languageEnglish
    Pages (from-to)941-953
    Number of pages13
    JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
    Volume356
    Issue number1739
    Publication statusPublished - 15 Apr 1998

    Keywords

    • Alumina formation
    • Effect of surfactants
    • Local oxidation
    • Marangoni flow
    • Steel reoxidation
    • Surface velocities

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