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@PHDTHESIS{Nentwig:18561,
      author       = {Nentwig, Thomas},
      title        = {{E}xperimentelle {B}estimmung und numerische {S}imulation
                      von {V}iskositäten in {S}chlackesystemen unter
                      {V}ergasungsbedingungen},
      volume       = {129},
      school       = {RWTH Aachen},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-18561},
      isbn         = {978-3-89336-756-6},
      series       = {Schriften des Forschungszentrums Jülich : Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {XIII, 156, XV-LXXVI Seiten},
      year         = {2011},
      note         = {Record converted from JUWEL: 18.07.2013; RWTH Aachen,
                      Diss., 2011},
      abstract     = {Silica melts are reflected in many different industrial and
                      natural processes such as slags in steel production and
                      gasification of coal, glass in the glass making industry,
                      lava in the volcanology and in lots of other fields.
                      Rheological properties like the viscosity of this silica
                      melts are really important in all of these processes. A
                      general and good working viscosity model would help all
                      scientists and engineers, who have to simulate and optimise
                      these processes. First, it is important to have the
                      possibility to measure viscosities of slags. As part of this
                      PhD thesis a new high-temperature high-pressure rotational
                      viscosimeter is developed for measurements up to ≥1600 °C
                      and 20 bar. Particularly in relation to the coal
                      gasification process this two parameters are really
                      important, because coal gasification occurs under high
                      temperatures and high pressures. With this new viscosimeter
                      it is possible to measure slag viscosities under realistic
                      gasification conditions. To show that the new viscosimeter
                      works quite good viscosity measurements of four real slags
                      have been done. The influence of pressure and atmosphere on
                      viscosity have been examined. The measurements are also
                      compared with different viscosity models. The Arrhenius- and
                      Weymann-Equation have been determined and the correlation
                      between viscosity and basicity of the slag has been
                      evaluated. In the second part of the Phd thesis a new
                      viscosity model is developed. The model is based on the
                      structure inside the slag and consists in existing
                      thermodynamic models. After a detailed literature research
                      the model is developed for the
                      SiO$_{2}$-Al$_{2}$O$_{3}$-Na$_{2}$O-K$_{2}$O system. The
                      quality of this new model is estimated by comparing
                      calculated viscosity values with measurements found during
                      the literature research. The new model is also compared with
                      other existing models for viscosity calculation.},
      cin          = {IEK-2},
      ddc          = {500},
      cid          = {I:(DE-Juel1)IEK-2-20101013},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/18561},
}