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@ARTICLE{Mauer:888363,
      author       = {Mauer, Georg},
      title        = {{H}ow {H}ydrogen {A}dmixture {C}hanges {P}lasma {J}et
                      {C}haracteristics in {S}pray {P}rocesses at {L}ow
                      {P}ressure},
      journal      = {Plasma chemistry and plasma processing},
      volume       = {41},
      issn         = {1572-8986},
      address      = {Dordrecht},
      publisher    = {Springer Science + Business Media B.V.},
      reportid     = {FZJ-2020-04869},
      pages        = {109-132},
      year         = {2021},
      abstract     = {In plasma spraying, hydrogen is widely used as a secondary
                      working gas besides argon. In particular under low pressure,
                      there are strong effects on the plasma jet characteristics
                      even by small hydrogen percentages. Under such conditions,
                      fundamental mechanisms like diffusion and recombination are
                      affected while this is less relevant under atmospheric
                      conditions. This was investigated for argon–hydrogen
                      mixtures by optical emission spectroscopy (OES). The small
                      electron densities under the investigated low pressure
                      conditions implied specific difficulties in the application
                      of several OES-based methods which are discussed in detail.
                      Adding hydrogen to the plasma gas effected an increased
                      plasma enthalpy. Moreover, the jet expanded radially as the
                      reactive part of the thermal conductivity was enhanced by
                      recombination of atomic hydrogen so that the shock waves
                      were less reflected at the cold jet rims. In the jet cores,
                      the lowest temperatures were found for the highest hydrogen
                      admixture because the energy consumption due to the
                      dissociation of molecular hydrogen outbalanced the increase
                      of the plasma enthalpy. Variations in the radial temperature
                      profiles were related to the jet structure and radial
                      thermal conductivity. The local hydrogen–argon
                      concentration ratios revealed an accumulation of hydrogen
                      atoms at the jet rims. Clear indications were found, that
                      higher hydrogen contents promoted the fast recombination of
                      electrons and ions. However, it is assumed that the
                      transport properties of the plasma were hardly affected by
                      this, since the electron densities and thus the ionization
                      degrees were generally small due to the low pressure
                      conditions},
      cin          = {IEK-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113) / 1241 - Gas turbines (POF4-124)},
      pid          = {G:(DE-HGF)POF3-113 / G:(DE-HGF)POF4-1241},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000595071400001},
      doi          = {10.1007/s11090-020-10143-6},
      url          = {https://juser.fz-juelich.de/record/888363},
}