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Experimental and numerical study of flows in PEM fuel cell stacks for traction applications; Etude numerique et experimentale des ecoulements dans une pile a combustible de type PEM adaptable aux applications embarquees

Thesis/Dissertation:

Abstract

The problems with the optimization and design of proton exchange membrane fuel cells (PEMFC) are mainly based on the mastery of water and heat transfers inside the active cells. A theoretical and experimental discussion about this topic is proposed. The average sharing coefficients of the generated water are measured for 3 Nora fuel cells (1, 5 and 10 kW). The values obtained with nafion 117 are in agreement with the data of the literature, while the 40% generated water recovered inside the anode compartment with nafion 115 are unexpected. The difficulty to obtain a physical formulation of electro-osmosis does not allow to quantify this coefficient and leads to justify the limitations of use of the numerical codes on this topic. However, by separating the intrinsic parameters of the electrodes/membrane system and the global operation parameters of a cell, it is possible to extrapolate realistic humidification strategies. In the framework of the European project 'Fever', a systemic model of a 30 kW module for electric-powered vehicle has been developed. For an optimum energy integration of Nora fuel cells in volume-limited applications, it is necessary to separate the humidification sections of these modules. In the case where air is used as oxidant,  More>>
Authors:
Publication Date:
Jul 01, 1998
Product Type:
Thesis/Dissertation
Report Number:
FRNC-TH-5348
Resource Relation:
Other Information: TH: These sciences appliquees; 111 refs.
Subject:
30 DIRECT ENERGY CONVERSION; 42 ENGINEERING; PROTON EXCHANGE MEMBRANE FUEL CELLS; OSMOSIS; HUMIDITY; PERMEABILITY; MEMBRANES; ELECTROLYTES; INTERFACES; NAVIER-STOKES EQUATIONS; NITROGEN; NUMERICAL ANALYSIS
OSTI ID:
20723653
Research Organizations:
Ecole Nationale Superieure des Mines, 75 - Paris (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR0300244
Availability:
Available from: service de documentation, Ecole des Mines de Paris, 60, Boulevard Saint Michel 75272 Paris cedex 06 (France)
Submitting Site:
FR
Size:
194 pages
Announcement Date:
May 12, 2006

Thesis/Dissertation:

Citation Formats

Picot, D. Experimental and numerical study of flows in PEM fuel cell stacks for traction applications; Etude numerique et experimentale des ecoulements dans une pile a combustible de type PEM adaptable aux applications embarquees. France: N. p., 1998. Web.
Picot, D. Experimental and numerical study of flows in PEM fuel cell stacks for traction applications; Etude numerique et experimentale des ecoulements dans une pile a combustible de type PEM adaptable aux applications embarquees. France.
Picot, D. 1998. "Experimental and numerical study of flows in PEM fuel cell stacks for traction applications; Etude numerique et experimentale des ecoulements dans une pile a combustible de type PEM adaptable aux applications embarquees." France.
@misc{etde_20723653,
title = {Experimental and numerical study of flows in PEM fuel cell stacks for traction applications; Etude numerique et experimentale des ecoulements dans une pile a combustible de type PEM adaptable aux applications embarquees}
author = {Picot, D}
abstractNote = {The problems with the optimization and design of proton exchange membrane fuel cells (PEMFC) are mainly based on the mastery of water and heat transfers inside the active cells. A theoretical and experimental discussion about this topic is proposed. The average sharing coefficients of the generated water are measured for 3 Nora fuel cells (1, 5 and 10 kW). The values obtained with nafion 117 are in agreement with the data of the literature, while the 40% generated water recovered inside the anode compartment with nafion 115 are unexpected. The difficulty to obtain a physical formulation of electro-osmosis does not allow to quantify this coefficient and leads to justify the limitations of use of the numerical codes on this topic. However, by separating the intrinsic parameters of the electrodes/membrane system and the global operation parameters of a cell, it is possible to extrapolate realistic humidification strategies. In the framework of the European project 'Fever', a systemic model of a 30 kW module for electric-powered vehicle has been developed. For an optimum energy integration of Nora fuel cells in volume-limited applications, it is necessary to separate the humidification sections of these modules. In the case where air is used as oxidant, the presence of nitrogen inside the anode compartment has been evidenced both in close and recirculation modes. In agreement with the literature data about nafion permeability, the nitrogen migration through the electrolyte is explained by the diffusion theory. A discussion about the interest of using both operational modes to maximize the energy efficiency is proposed. Finally, a simple-phase and double-phase numerical study with interface reconstruction is carried out using the resolution of Navier-Stokes equations in Eulerian formalism in order to consider the problems linked with the internal flows inside the collectors of Nora cells. (J.S.)}
place = {France}
year = {1998}
month = {Jul}
}