The Experts below are selected from a list of 15 Experts worldwide ranked by ideXlab platform

Felix Ziegler - One of the best experts on this subject based on the ideXlab platform.

  • Impact of a Developing Velocity Profile on Heat and Mass Transfer in Absorbing Laminar Falling Films
    Chemie Ingenieur Technik, 2015
    Co-Authors: Martin Mittermaier, Felix Ziegler
    Abstract:

    This study describes a Developing laminar falling film over a vertical plate while heat and mass transfer occurs. The model accounts for a Developing film thickness and uni-directional diffusion. The fluid properties are assumed to be constant, and latent heat, which is relatively large in comparison to the sensible heat, is set free at the liquid-vapor interface. Temperature and concentration Profiles in the film, the development of the interface Velocity, as well as the absorbed mass fluxes are presented and two different boundary conditions have been applied to the inlet of the film.

Renato M. Cotta - One of the best experts on this subject based on the ideXlab platform.

  • Hybrid integral transforms for flow development in ducts partially filled with porous media
    Proceedings. Mathematical physical and engineering sciences, 2018
    Co-Authors: Kleber Marques Lisboa, Renato M. Cotta
    Abstract:

    A hybrid numerical-analytical solution is developed for laminar flow development in a parallel plate duct partially filled with porous media. The integral transform method is employed in combination with a single domain reformulation strategy for representing the heterogeneous media within the channel. A novel eigenfunction expansion basis is proposed, including abrupt spatial variations of physical properties due to the domain transitions. The introduction of the new basis allows for a solution with similar convergence rates as in previous applications with simpler formulations, as demonstrated through a careful convergence analysis of the expansions. The inherent automatic error control characteristic of the integral transforms approach then provides benchmark results for the Developing Velocity Profile. Moreover, a physical analysis further verifies the consistency of both the proposed expansion and the mixed symbolic-numerical code developed. A detailed verification with a finite-element commercial code is also performed.

Martin Mittermaier - One of the best experts on this subject based on the ideXlab platform.

  • Impact of a Developing Velocity Profile on Heat and Mass Transfer in Absorbing Laminar Falling Films
    Chemie Ingenieur Technik, 2015
    Co-Authors: Martin Mittermaier, Felix Ziegler
    Abstract:

    This study describes a Developing laminar falling film over a vertical plate while heat and mass transfer occurs. The model accounts for a Developing film thickness and uni-directional diffusion. The fluid properties are assumed to be constant, and latent heat, which is relatively large in comparison to the sensible heat, is set free at the liquid-vapor interface. Temperature and concentration Profiles in the film, the development of the interface Velocity, as well as the absorbed mass fluxes are presented and two different boundary conditions have been applied to the inlet of the film.

Kleber Marques Lisboa - One of the best experts on this subject based on the ideXlab platform.

  • Hybrid integral transforms for flow development in ducts partially filled with porous media
    Proceedings. Mathematical physical and engineering sciences, 2018
    Co-Authors: Kleber Marques Lisboa, Renato M. Cotta
    Abstract:

    A hybrid numerical-analytical solution is developed for laminar flow development in a parallel plate duct partially filled with porous media. The integral transform method is employed in combination with a single domain reformulation strategy for representing the heterogeneous media within the channel. A novel eigenfunction expansion basis is proposed, including abrupt spatial variations of physical properties due to the domain transitions. The introduction of the new basis allows for a solution with similar convergence rates as in previous applications with simpler formulations, as demonstrated through a careful convergence analysis of the expansions. The inherent automatic error control characteristic of the integral transforms approach then provides benchmark results for the Developing Velocity Profile. Moreover, a physical analysis further verifies the consistency of both the proposed expansion and the mixed symbolic-numerical code developed. A detailed verification with a finite-element commercial code is also performed.

Göran Lindbergh - One of the best experts on this subject based on the ideXlab platform.

  • A Simulation of the Tertiary Current Density Distribution from a Chlorate Cell: I. Mathematical Model
    Journal of The Electrochemical Society, 2001
    Co-Authors: P O'byrne, Eduardo Fontes, O. Parhammar, Göran Lindbergh
    Abstract:

    Numerical modeling is becoming an integral part of all research and development within the field of electrolytic systems. A numerical model that calculates the current density distribution and concentration Profiles of a chlorate cell is presented here, The results are shown as functions of electrolyte Velocity and exchange current density. The model takes into account the three transport mechanisms; diffusion, migration, and convection by considering the development of the flow Velocity vector through the channel. It was seen that the Developing Velocity Profile influences the concentration overpotentials, which in turn influences current density distributions. Results from the model show that the total current density decreased along the length of the anode, and that this distribution varied more at lower velocities. In addition, it was seen that migration contributes significantly to species transport, even within the diffusion layer. Finally, the model indicates that the hypochlorite ion is the main participant in the principal side reaction producing oxygen, and not the hypochlorous acid molecule. The results are useful as they increase knowledge of the chlorate process, and can be used to simulate future systems with a wide range of varying parameters such as cell geometry, flow, electrolyte composition, and electrode materials. The aim of the model is to use it as a tool for identifying the sources that contribute to the overpotential in the cell. This article concentrates on the concentration overpotential, which is one of the phenomena that can actually be influenced,