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@PHDTHESIS{Shu:975182,
      author       = {Shu, Qiya},
      othercontributors = {Kneer, Reinhold and Rohlfs, Wilko},
      title        = {{E}ffective thermal conductivity enhancement of particle
                      suspensions under shear flow conditions},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {RWTH Aachen University},
      reportid     = {RWTH-2023-11882},
      pages        = {1 Online-Ressource : Illustrationen},
      year         = {2023},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University 2024; Dissertation, Rheinisch-Westfälische
                      Technische Hochschule Aachen, 2023},
      abstract     = {Cooling of thermally highly stressed components has gained
                      severe attention, especially for high-power-density
                      components applied in electric vehicles. Particle
                      suspensions enhance the thermal conductivity of cooling
                      liquidby incorporating the high thermal performance of solid
                      particles. Under strong shear flow conditions, suspensions
                      are known to alter their properties. Therefore, this
                      dissertation focuses on the interaction between
                      dispersedsolid particles and the surrounding fluid, i.e. the
                      shear-induced particle rotations in the flow and the
                      resultanting reinforced convective heat transfer. For
                      spherical particles, a steady Finite Element solver can work
                      out solid results by iteratively adapting pre-assumed
                      particle rotation speeds until the shear stress on the
                      particle surface is vanished. For non-spherical particles,
                      only transient numerical solvers are capable of resolving
                      the complex particle dynamics. To reduce computational
                      expenses, the Lattice-Boltzmann Method coupled with Discrete
                      Element Method is employed for fluid and particle dynamics,
                      respectively. Additionally, a Finite Element Method code is
                      incorporated to account for thermal conduction inside the
                      particles and to provide missing information from the
                      Discrete Element Method. The LBM-DEM-FEM coupling scheme is
                      further applied to particle-laden channel flows including
                      particle-particle and particle-wall interaction models.The
                      findings indicate that for a single particle in simple shear
                      flows, the effective thermal conductivity of the suspension
                      saturates if the thermal conductivity of the particles is
                      large. Another saturation behavior is observeddue to
                      high-shear-rates-induced particle rotations in the flow,
                      which leads to a quasi iso-thermal layer around the
                      particle, rendering particle materials less significant.
                      However, such saturation-required shear rates are so
                      largethat these are rarely reached for oblate spheroidal
                      particles. Among different rotational states of oblate
                      spheroidal particles, log-rolling, which involves rotation
                      around the minor axis, shows an advantage in terms of heat
                      transfercapability. Additionally, particles with higher
                      density ratios compared to the base fluid are more likely to
                      exhibit log-rolling in shear flows. Nevertheless, for
                      multi-particle loaded channel flows, the overall thermal
                      convection enhancement by varying particle-fluid density
                      ratios is not significantly different. Instead, larger
                      particle volume fractions and smaller channel-particle size
                      ratios are found to be rather decisive factors.},
      cin          = {412610},
      ddc          = {620},
      cid          = {$I:(DE-82)412610_20140620$},
      pnm          = {GRK 1856 - GRK 1856: Integrierte Energieversorgungsmodule
                      für straßengebundene Elektromobilität (210731724)},
      pid          = {G:(GEPRIS)210731724},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2023-11882},
      url          = {https://publications.rwth-aachen.de/record/975182},
}