Blar i forfatter "Wilhelmsen, Øivind"

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    • The Nasal Geometry of the Reindeer Gives Energy-Efficient Respiration 

      Magnanelli, Elisa; Wilhelmsen, Øivind; Acquarone, Mario; Folkow, Lars; Kjelstrup, Signe (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-07-14)
      Reindeer in the arctic region live under very harsh conditions and may face temperatures below 233 K. Therefore, efficient conservation of body heat and water is important for their survival. Alongside their insulating fur, the reindeer nasal mechanism for heat and mass exchange during respiration plays a fundamental role. We present a dynamic model to describe the heat and mass transport that takes ...

    • Thermal modeling of the respiratory turbinates in arctic and subtropical seals 

      Flekkøy, Eirik Grude; Folkow, Lars; Kjelstrup, Signe; Mason, Matthew J.; Wilhelmsen, Øivind (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-06)
      Mammals possess complex structures in their nasal cavities known as respiratory turbinate bones, which help the animal to conserve body heat and water during respiratory gas exchange. We considered the function of the maxilloturbinates of two species of seals, one arctic (<i>Erignathus barbatus</i>), one subtropical (<i>Monachus monachus</i>). By means of a thermo-hydrodynamic model that describes ...