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  • 1.
    Martinsson, Johan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.
    Glaser, Bjoern
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.
    Sichen, Du
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.
    The structure of foaming BOF-converter slag2019In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 46, no 8, p. 777-781Article in journal (Refereed)
    Abstract [en]

    The structure of foaming synthetic BOF-converter slags was studied by freezing the foam and using ocular examination. The foams were generated by CO gas formed due to the reaction between FeO in the slag and carbon in the hot metal. The character of the foams varied a lot with slag composition. Slag with lower viscosity resulted in foams with small gas bubbles, while slag having high viscosity resulted in very big bubbles.

  • 2.
    Martinsson, Johan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Glaser, Björn
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Sichen, Du
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Study on Apparent Viscosity and Structure of Foaming Slag2016In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 47, no 5, p. 2710-2713Article in journal (Refereed)
    Abstract [en]

    Foaming slag was generated using induction heating. The foam was found non-Newtonian having much higher apparent viscosity compared to the dynamic viscosity of pure slag. Quenched foam was examined. The appearance of the foaming slag was very different from silicone oil-gas foam. The size of gas bubbles ranged from 0.1 to 4 mm (while in the case of silicone oil, 1 to 2 mm). The gas fraction in the foam was considerably lower than in the case of silicone oil.

  • 3.
    Martinsson, Johan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Sichen, Du
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Study on Apparent Viscosity of Foam and Droplet Movement Using a Cold Model2016In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 87, no 6, p. 712-719Article in journal (Refereed)
    Abstract [en]

    The apparent viscosities of foams generated by passing argon through silicone oil are measured. The foams are found to be non-Newtonian flows having apparent viscosities 4-5 times higher than the dynamic viscosity of the origin fluid. The movements of different particles and droplets and their residence times are studied. The measured average velocities of the particles/droplets are substantially lower than the values estimated based on the dynamic viscosities. For both mechanical and gas stirrings, the flows of the foam are very different from pure liquid. The movement of the bar and stirring gas bubbles only pushes a limited number of bubbles which are very close to them to move. No bulk flow as in pure liquid is generated by the stirring. The apparent viscosities of foams generated by passing argon through silicone oil are measured. The foams are found to be non-Newtonian flows and have apparent viscosities about 4-5 times higher than the dynamic viscosity. The average velocities of the particles/droplets moving in the foam are substantially lower than the values estimated based on the dynamic viscosities of the oils.

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