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Enhancing the performance of polymer electrolyte membrane fuel cell by optimizing the operating parameter

  • Nima AhmadiEmail author
  • Sadra Rostami
Technical Paper
  • 6 Downloads

Abstract

In present paper it is tried to concentrate to the configurations of gas channels and gas diffusion layers influences on the performance of polymer electrolyte membrane fuel cell. At first, increasing the number of channels is considered and observed such that the best results are gained with the case of three channels. Afterward, effect of prominent GDLs is studied. The prominences size is one of the main parameters which affect the performance. For this purpose, radius (R) of prominences is grown gradually. The optimal performance is obtained in the case of R = 0.45. In addition, the inlet velocity of gas flow is surveyed. The results indicate that when the inlet velocity of gases is set about 0.2 m s−1, the species diffusion is optimized. Also, the height of channels is investigated to find out the optimal channel height. It is found that the highest performance is achieved in channel height about h = 1 mm and R = 0.45 mm.

Keywords

Gas diffusion layer Numerical simulation Geometrical configuration Prominence 

List of symbols

C

Concentration of species (mol m−3)

D

Mass diffusion coefficient (m2 s−1)

I

Local current density (A cm−2)

K

Permeability (m2)

nd

Electro-osmotic drag coefficient

P

Pressure (Pa)

T

Temperature (K)

u

Velocity vector

k

Anode or cathode

v

Volume (m3)

Greek letter

ρ

Density (kg m−3)

εeff

Effective porosity

Φe

Electrolyte phase potential (varies from − 1 to 1) (V)

μ

Viscosity (kg m−1 s−1)

σm

Protonic conductivity (1 ohm−1 m−1)

κ

Membrane ionic conductivity (S m−1)

Subscripts and superscripts

L

Gas channel length

h

Gas channel height

ch

Channel

Bp

Bipolar plate

R

Prominence radius

MEA

Membrane electrolyte assembly

GDL

Gas diffusion layer

cop

Cathode over potential

aop

Anode over potential

AR

Prominences aspect ratio compared to channel

Re

Reynolds number

l

Liquid phase

g

Gas phase

Notes

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Faculty of Shaheed BeheshtiTechnical and Vocational University (TVU)UrmiaIran
  2. 2.Faculty of Mechanical EngineeringUrmia University of TechnologyUrmiaIran

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