H. White, L. Luo
Department of Chemistry, University of Utah, Salt Lake City, UT, USA
A characteristic feature of nanochannels is that surface properties (e.g., electrical charge) play a more significant role in the transport of fluid and electrolyte. Two oppositely directed flows (electroosmotic flow and pressure-driven flow) determine the flow profile at the nanopore orifice as well as electrolyte distribution. Once there are two electrolyte solutions with different ...
University of Trinidad and Tobago, Couva, Trinidad and Tobago
This paper presents a 2D model of an intermediate temperature ammonia-fed SOFC (400 – 700 °C) based on the Temkin-Pyzhev model of ammonia decomposition. Phenomenological equations are implemented in COMSOL Multiphysics®. The Dusty Gas Model is used to model species transport in porous media, but a modification of Fick’s Law is used. Results show that intermediate temperatures can alleviate ...
E. Gutierrez-Miravete, M. Turner
Rensselaer at Hartford, Hartford, CT, USA
General Dynamics-Electric Boat, Groton, CT, USA
Galvanic corrosion is encountered in marine applications because one often has dissimilar metal joints and seawater acts as an electrolyte. One metal acts predominantly as anode and undergoes material dissolution while the other acts predominantly as cathode and is the site where a cathodic reaction takes place. Assuming a stagnant electrolyte, the equation governing the distribution of ...
Amimer, A.1, 2, Mandin, P.3, Lincot, D.3, Horner, O.1
1 EDF R&D, Département MMC, Moret-sur-Loing, France
2 Ecole Nationale Supérieure de Chimie de Paris, Paris, France
3 Ecole Nationale Supérieure de Chimie de Paris, UMR 7575, Paris, France
Flow Accelerated Corrosion (FAC) of carbon steel has been studied world-wide for more than twenty years and is now fairly well understood. The influence of several parameters like water chemistry (pH, dioxygen content), temperature, hydrodynamic or mass transfer conditions (flow velocity, geometry) and steel composition on the corrosion kinetics has been demonstrated both theoretically (“Berge ...
Blondel, P., Girardin, G.
AREVA, Centre Technique Framatome ANP, Dpt Corrosion-Chimie Porte Magenta, Le Creusot, France
Crevice corrosion is a form of localized corrosion, which occurs in zones where a metallic material surface is in contact with a small volume of confined, stagnant liquid whereas most of the material surface is exposed to the bulk environment. A 1D model is proposed, combining the mass transport equations written for each chemical species with the electroneutrality condition. The homogenous ...
Cheddie D., Munroe, N.
Mechanical & Materials Engineering, Florida International University, Miami, FL
All of the work conducted in proton exchange membrane fuel cell (PEMFC) modeling to date has been limited to low temperature applications. The present work is based on the development of a complete 2-D mathematical model of a high temperature PEMFC, which accounts for multi-component fluid flow with electrochemical reactions, heat transfers, and potential variations. The computational domain ...
Gabrielli, C., Keddam, M., Rousseau, P., Vivier, V.
UPR 15 CNRS “LISE”, case 133 - Université P. & M. Curie, Paris, France
Numerical simulations of electrochemical impedance diagrams are reported using a 2D-axis symmetry FEM calculations. The impedance is the ratio of the potential over the current, but it is highly depending of the concentration of the various chemical species in the solution, particularly the ionic ones wich are sensible to migration, diffusion and convection effects. In this study, only the ...
Malki, B., Baroux, B.
LTPCM/INPG Grenoble, France
Modelling of pit chemistry in applied polarization mode is carried out using finite element method techniques (FEM). The results lead to the formulation of critical conditions for pit stabilization in terms of pit geometry and applied potential. More detailed computing is performed to compare the stability behaviour of both ferritic AISI 430 and austenitic AISI 304 stainless steels. The ...
Optimization of the H2O2 - NaBH4 Regenerative Fuel Cell for Space Power Applications using FEMLAB Modeling
Miley, G.H., Luo, N., Mather, J., Byrd, E., Hawkins, G., Gu, L., Nayak, A., Burton, R., Shrestha, P.J.
Departments of NPRE, Aerospace Engineering, Mechanical Engineering, and Electrical and Computer Engineering, University of Illinois, Urbana, IL
FEMLAB is being employed to study and optimize a unique new type of fuel cell (FC) that uses H2O2 in a low temperature PEM type FC directly at the cathode. Experiments with a series of small 5-W units are being analyzed using FEMLAB 3.1 with the Chemical Engineering and Electromagnetics modules. Once benchmarked, the FEMLAB model will be used in design studies for the scaled up 500W and kW cells ...
Serincan, M.F, Yesilyurt, S
Mechatronics Program, Sabanci University
¤Understanding of PEMFC’s dynamics and integration with other components ¤Identification of the failure modes ¤Optimal control of the PEMFC ¤Efficiency ¤Lifetime ¤Response time