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  • 1.
    Ahmed, Hesham
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Seetharaman, Seshadri
    Kungliga tekniska högskolan, KTH.
    Isothermal dynamic thermal diffusivity studies of the reduction of NiO and NiWO4 precursors by hydrogen2011In: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, Vol. 102, no 11, p. 1336-1344Article in journal (Refereed)
    Abstract [en]

    Thermal diffusivity measurements of uniaxially cold pressed NiO and NiWO4 were carried out in a dynamic mode in order to monitor the kinetics of hydrogen reduction of the above-mentioned materials using a laser flash unit. The calculated activation energy was found to be higher than that for chemically-controlled reaction obtained earlier by thermogravimetry. The difference has been attributed to physical changes occurring along with the chemical reaction. The activation energy of sintering of the products was evaluated to be 33 and 36 kJ mol-1 for NiO and NiWO4, respectively. Thermal conductivities were calculated taking into consideration the change in heat capacity considering the compositional and the structural changes with the progress of the reaction. The potentiality of the laser-flash method as a complementary technique to thermogravimetry in understanding the mechanism of gas-solid reactions is discussed.

  • 2.
    Muhmood, Luckman
    et al.
    Division of Materials Process Science, Department of Materials Science and Engineering, Royal Institute of Technology.
    Nurni, Viswanathan
    Seetharaman, Seshadri
    Division of Materials Process Science, Department of Materials Science and Engineering, Royal Institute of Technology.
    Studies of dynamic mass transfer at the slag–metal interface: Interfacial velocity measurements2012In: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, no 7, p. 875-883Article in journal (Refereed)
    Abstract [en]

    The dynamics of oxygen transport along the slag – metal interface of pure iron and alumina-saturated CaO – Al2O3– SiO2slag was studied using high-temperature X-ray image analysis. The oscillations of the metal drop occurring due to the interfacial movement of oxygen atoms driven by Marangoni forces were studied in detail. The change in interfacial area during the oscillations was measured using a digitizing software and MATLAB. It was observed that the interfacial velocity as a function of oxygen exhibits insignificant variation with temperature. Further, the values obtained for the interfacial velocity using oxygen concentration difference at the interface were slightly lower in comparison to those using sulfur. The possible reason for this lower velocity could be that, although oxygen is a smaller atom compared to that of sulfur, the energy barrier at the free iron surface is higher for oxygen, thus hindering its motion along the interface

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