Browsing NTNU Open by Author "Karchniwy, Ewa Malgorzata"

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    • The effect of turbulence on mass transfer in solid fuel combustion: RANS model 

      Karchniwy, Ewa Malgorzata; Haugen, Nils Erland L; Klimanek, Adam F.; Langørgen, Øyvind; Sladek, Slawomir (Peer reviewed; Journal article, 2021)
      In this paper, a kinetic-diffusion surface combustion model is examined. The model is modified such that two effects of turbulence are included: 1) enhancement of the mass transfer due to relative velocity between particles ...

    • The effect of turbulence on the conversion of coal under blast furnace raceway conditions 

      Wartha, Eva-Maria; Haugen, Nils Erland L; Karchniwy, Ewa Malgorzata; Bösenhofer, Markus; Harasek, Michael; Løvås, Terese (Peer reviewed; Journal article, 2022)
      dynamics (CFD) can be used to analyze the process virtually and thus improve its performance. Different reducing agents can be used to (partially) substitute the coke and consequently reduce overall emissions. To analyze ...

    • A numerical study on the combustion of a resolved carbon particle 

      Karchniwy, Ewa Malgorzata; Haugen, Nils Erland L; Klimanek, Adam (Journal article; Peer reviewed, 2021)
      Combustion of a single, resolved carbon particle is studied using a novel numerical approach that makes use of an overset grid. The model is implemented into the framework of a compressible Direct Numerical Simulation (DNS) ...

    • The effect of turbulence on mass transfer rates between inertial polydisperse particles and fluid 

      Karchniwy, Ewa Malgorzata; Klimanek, Adam F.; Haugen, Nils Erland L (Journal article; Peer reviewed, 2019)
      The current work investigates how turbulence affects the mass transfer rate between inertial particles and fluid in a dilute, polydisperse particle system. Direct numerical simulations are performed in which all scales of ...

    • Thermophoresis and its effect on particle impaction on a cylinder for low and moderate Reynolds numbers 

      Haugen, Nils Erland L; Krüger, Jonas; Aarnes, Jørgen Røysland; Karchniwy, Ewa Malgorzata; Klimanek, Adam (Peer reviewed; Journal article, 2021)
      The effect of thermophoresis on the impaction of particles on a cylinder is investigated for different particle sizes, particle conductivities, temperature gradients and for Reynolds numbers between 100 and 1600. This is ...