Browsing NTNU Open by Author "Vachaparambil, Kurian J."

Now showing items 1-12 of 12

    • Comparison of Surface Tension Models for the Volume of Fluid Method 

      Vachaparambil, Kurian J.; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2019)
      With the increasing use of Computational Fluid Dynamics to investigate multiphase flow scenarios, modelling surface tension effects has been a topic of active research. A well known associated problem is the generation of ...

    • Comparison of Surface Tension Models for the Volume of Fluid Method 

      Vachaparambil, Kurian J.; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2019)
      With the increasing use of Computational Fluid Dynamics to investigate multiphase flow scenarios, modelling surface tension effects has been a topic of active research. A well known associated problem is the generation of ...

    • Explanation of Bubble Nucleation Mechanisms: A Gradient Theory Approach 

      Vachaparambil, Kurian J.; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2018)
      A Helmholtz free energy description of the four nucleation mechanisms used to explain the bubble nucleation in electrochemical systems is presented. The mechanisms are compared based on the nucleation energy barrier and ...

    • Interface resolved simulations of continuum scale electrochemical hydrogen evolution 

      Vachaparambil, Kurian J. (Doctoral theses at NTNU;2020:363, Doctoral thesis, 2020)
      An important aspect of improving the efficiency of water electrolysis is to remove the electrochemically generated hydrogen and oxygen bubbles. The evolution of these gases, which are associated with increased electrical ...

    • Modeling interfacial mass transfer driven bubble growth in supersaturated solutions 

      Vachaparambil, Kurian J.; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2020)
      A commonly encountered phenomenon in chemical processes is bubble evolution driven by supersaturation. On the continuum scale, this essentially involves interfacial mass transfer resulting in the growth of bubbles and their ...

    • Numerical simulation of bubble growth in a supersaturated solution 

      Vachaparambil, Kurian J.; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2020)
      In this paper, a Volume of Fluid (VOF) based approach to simulate the growth of a pre-existing bubble in a supersaturated solution is developed and implemented in OpenFOAMⓇ. The model incorporates the Compressive Continuous ...

    • Numerical simulation of continuum scale electrochemical hydrogen bubble evolution 

      Vachaparambil, Kurian J.; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2021)
      One of the important aspects in improving the efficiency of electrochemical processes, such as water electrolysis, is the efficient removal of bubbles which evolve from the electrodes. Numerical modelling based on Computational ...

    • On modelling electrochemical gas evolution using the volume of fluid method 

      Vachaparambil, Kurian J.; Einarsrud, Kristian Etienne (Chapter, 2020)
      In this work we describe the various building block relevant in simulating electrochemical gas evolution using Volume of Fluid (VOF) method. These building blocks are implemented in the VOF solver available in OpenFOAM® ...

    • On sharp surface force model: effect of sharpening coefficient 

      Vachaparambil, Kurian J.; Einarsrud, Kristian Etienne (Journal article, 2020)
      Amongst the multitude of approaches available in literature to reduce spurious velocities in Volume of Fluid approach, the Sharp Surface Force (SSF) model is increasingly being used due to its relative ease to implement. ...

    • Post Processing Approach to Model Microsilica Formation 

      Vachaparambil, Kurian J.; Einarsrud, Kristian Etienne; Dalaker, Halvor; Andersson, Stefan (Peer reviewed; Journal article, 2023)
      In this work an OpenFOAM-based framework to simulate the evolution of microsilica, which is an important byproduct in the silicon/ferrosilicon industries, is proposed. The framework decouples the combustion reaction of CO ...

    • A Pragmatic Model for Alumina Feeding 

      Johansen, Stein Tore; Einarsrud, Kristian Etienne; Solheim, Asbjørn; Vachaparambil, Kurian J. (Peer reviewed; Journal article, 2022)
      In this paper, we demonstrate how we can develop a coarse-grained model for the alumina distribution in an aluminium reduction cell. The model is designed to have the potential of being a part of a control system or play ...

    • A Pragmatic Model for Bath Temperature Evolution During Alumina Feeding 

      Vachaparambil, Kurian J.; Johansen, Stein Tore; Solheim, Asbjørn; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2023)
      In this paper, we extend the pragmatic model for alumina feeding, presented in Johansen et al. Light metals 2022, to treat the associated evolution of bath temperature. The underlying idea of the framework is to reduce its ...