The Experts below are selected from a list of 20814 Experts worldwide ranked by ideXlab platform

Inci Eroglu - One of the best experts on this subject based on the ideXlab platform.

  • modeling and sensitivity analysis of high temperature pem fuel cells by using Comsol Multiphysics
    International Journal of Hydrogen Energy, 2016
    Co-Authors: Berna Sezgin, Dilara Gulcin Caglayan, Yilser Devrim, Thomas Steenberg, Inci Eroglu
    Abstract:

    Abstract The objective of this study is to observe the effect of the critical design parameters, velocities of inlet gases (hydrogen and air) and the conductivity of polymer membrane, on the performance of a high temperature PEM fuel cell. A consistent and systematic mathematical model is developed in order to study the effect of these parameters. The model is applied to an isothermal, steady state, three-dimensional PEM fuel cell in order to observe concentration profiles, current density profiles and polarization curves. The model includes the transport of gases in anode and cathode gas flow channels, diffusion in the catalyst layers, the transport of water and hydronium ion in the polymer electrolyte and in the catalyst layers, and the transport of electrical current in the solid phase. The model is considered as having a single flow channel. The simulation is performed by using licensed Comsol Multiphysics 5.0, Fuel Cells &Batteries Module. The results compare well with the experimental polarization data obtained at 160 °C for ohmic and activation regions. The best match with the experimental data is obtained when the inlet hydrogen gas velocity is 0.133 m/s whereas inlet air velocity is 1.3 m/s for proton conductivity of 10 S/m.

Berna Sezgin - One of the best experts on this subject based on the ideXlab platform.

  • modeling and sensitivity analysis of high temperature pem fuel cells by using Comsol Multiphysics
    International Journal of Hydrogen Energy, 2016
    Co-Authors: Berna Sezgin, Dilara Gulcin Caglayan, Yilser Devrim, Thomas Steenberg, Inci Eroglu
    Abstract:

    Abstract The objective of this study is to observe the effect of the critical design parameters, velocities of inlet gases (hydrogen and air) and the conductivity of polymer membrane, on the performance of a high temperature PEM fuel cell. A consistent and systematic mathematical model is developed in order to study the effect of these parameters. The model is applied to an isothermal, steady state, three-dimensional PEM fuel cell in order to observe concentration profiles, current density profiles and polarization curves. The model includes the transport of gases in anode and cathode gas flow channels, diffusion in the catalyst layers, the transport of water and hydronium ion in the polymer electrolyte and in the catalyst layers, and the transport of electrical current in the solid phase. The model is considered as having a single flow channel. The simulation is performed by using licensed Comsol Multiphysics 5.0, Fuel Cells &Batteries Module. The results compare well with the experimental polarization data obtained at 160 °C for ohmic and activation regions. The best match with the experimental data is obtained when the inlet hydrogen gas velocity is 0.133 m/s whereas inlet air velocity is 1.3 m/s for proton conductivity of 10 S/m.

Cristina M Sabliov - One of the best experts on this subject based on the ideXlab platform.

  • Comsol Multiphysics model for continuous flow microwave heating of liquids
    Journal of Food Engineering, 2011
    Co-Authors: Deepti Salvi, Dorin Boldor, Giovanna M Aita, Cristina M Sabliov
    Abstract:

    Abstract A numerical model was developed to simulate temperature profiles in Newtonian as well as non-Newtonian fluids during continuous flow microwave heating by iterative coupling of electromagnetism, fluid flow and heat transport in Comsol Multiphysics. The model was validated by using extensive experimental data for carboxymethyl cellulose solution and tap water flowing at two different flow rates (1 and 2 l/m) through a 915 MHz continuous flow microwave system at 4 kW of power. The electromagnetic power generation (18–20% error) and average numerical temperature were in fairly good agreement with the average experimental temperatures for carboxymethyl cellulose (R2 = 0.89 at 1 l/m and R2 = 0.91 at 2 l/m) and tap water (R2 = 0.90 at 1 l/m and R2 = 0.81 at 2 l/m).

Hanifi Missoum - One of the best experts on this subject based on the ideXlab platform.

  • Numerical simulation of heat losses from a slab-on-ground structure using Comsol-Multiphysics
    Mouloud Mammeri University of Tizi-Ouzou, 2021
    Co-Authors: Wissem Bouraoui, Nadia Laredj, Mustapha Maliki, Hanifi Missoum
    Abstract:

    A transient two-dimensional numerical simulation using the Comsol-Multiphysics software, is carried out for an experimental structure (Minnesota Experiment), and using the same thermo-physical properties of the soil and the same indoor and outdoor climatic conditions. The general heat transfer equation in unsaturated porous media has been used to simulate energy losses. A mathematical approach has also been developed in order to calculate the thermal conductivity of different materials with the aim of making them closer to real values. The main goal is to compare the results of the simulated temperatures with the values measured in-situ. An excellent correlation between the simulated temperatures and those resulting from the experimental structure was obtained. At the same time, the exhaustive analysis of heat fluxes crossing the soil-structure interface has enabled us to propose practical solutions for reducing losses through the slab-on-ground

  • Two-Dimensional Transient Modeling of Energy and Mass Transfer in Porous Building Components using Comsol Multiphysics
    Isfahan University of Technology, 2017
    Co-Authors: Mustapha Maliki, Nadia Laredj, Karim Bendani, Hanifi Missoum
    Abstract:

    This paper reports on a transient heat, air and moisture transfer (HAM) model. The governing partial-differential equations are simultaneously solved for temperature and capillary pressure through multi-layered porous media, including the non-linear transfer and storage properties of materials. Using partial differential equations functions, some thermo-physical properties of porous media are converted into coefficients depending on temperature and capillary pressure. Major features of the model are multi-dimensional and transient coupling of heat, air and moisture transport. The coupled equations are solved using the Comsol Multiphysics time-dependent solver. This solver enables HAM (Heat, Air, Moisture) modeling in porous media. Besides, the good agreements obtained with a 2D benchmark suggest that the model can be used to assess the hygrothermal performance of building envelope components. This paper concludes that the total heat flux in the insulated wall represents only the quarter of that crossing the uninsulated concrete roof. On the other hand, the concrete having the lowest water vapour permeability of all used materials allows maintaining the vapour pressure levels close to the initial value (103 Pa). This induces a situation of interstitial condensation within the concrete of the roof. Being able to evaluate the hygrothermal behaviour, the proposed model may turn out to be a valuable tool to solve other building problems

Yilser Devrim - One of the best experts on this subject based on the ideXlab platform.

  • modeling and sensitivity analysis of high temperature pem fuel cells by using Comsol Multiphysics
    International Journal of Hydrogen Energy, 2016
    Co-Authors: Berna Sezgin, Dilara Gulcin Caglayan, Yilser Devrim, Thomas Steenberg, Inci Eroglu
    Abstract:

    Abstract The objective of this study is to observe the effect of the critical design parameters, velocities of inlet gases (hydrogen and air) and the conductivity of polymer membrane, on the performance of a high temperature PEM fuel cell. A consistent and systematic mathematical model is developed in order to study the effect of these parameters. The model is applied to an isothermal, steady state, three-dimensional PEM fuel cell in order to observe concentration profiles, current density profiles and polarization curves. The model includes the transport of gases in anode and cathode gas flow channels, diffusion in the catalyst layers, the transport of water and hydronium ion in the polymer electrolyte and in the catalyst layers, and the transport of electrical current in the solid phase. The model is considered as having a single flow channel. The simulation is performed by using licensed Comsol Multiphysics 5.0, Fuel Cells &Batteries Module. The results compare well with the experimental polarization data obtained at 160 °C for ohmic and activation regions. The best match with the experimental data is obtained when the inlet hydrogen gas velocity is 0.133 m/s whereas inlet air velocity is 1.3 m/s for proton conductivity of 10 S/m.