A Droplet Size Dependent Multiphase Mixture Model and Three-dimensional Simulation of PEM Fuel Cells

2019 ◽  
Vol 19 (26) ◽  
pp. 51-64
Author(s):  
Guangli He ◽  
Yohtaro Yamazaki ◽  
Abuliti Abudula
Keyword(s):  
Fuel Cells ◽  
Mixture Model ◽  
Droplet Size ◽  
Three Dimensional ◽  
Pem Fuel Cells ◽  
Size Dependent ◽  
Multiphase Mixture ◽  
Dimensional Simulation

A droplet size dependent multiphase mixture model for two phase flow in PEMFCs

2009 ◽  
Vol 194 (1) ◽  
pp. 190-198 ◽  
Author(s):  
Guangli He ◽  
Yohtaro Yamazaki ◽  
Abuliti Abudula
Keyword(s):  
Mixture Model ◽  
Droplet Size ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Size Dependent ◽  
Multiphase Mixture

Three Dimensional Analysis of Transport and Reaction in Proton Exchange Membrane Fuel Cells

2000 ◽  
Author(s):  
Sukkee Um ◽  
C. Y. Wang
Keyword(s):  
Fuel Cells ◽  
Flow Field ◽  
Proton Exchange Membrane ◽  
Computational Study ◽  
Three Dimensional ◽  
Pem Fuel Cells ◽  
Proton Exchange ◽  
Serpentine Flow Field ◽  
Interdigitated Flow Field ◽  
Exchange Membrane

Abstract A three-dimensional computational study based on the finite volume method is carried out for proton exchange membrane (PEM) fuel cells with a Nation 117 membrane and an interdigitated flow field on the cathode. Emphasis is placed on obtaining a fundamental understanding of fully three-dimensional flow in the air cathode and how it impacts the transport and electrochemical reaction processes. For the first time, fully three-dimensional results of the flow structure, species profiles and current distribution are presented for PEM fuel cells with the interdigitated flow field. The model results show that forced convection induced by the interdigitated flow field in the backing layer substantially improves mass transport of oxygen to, and water removal from, the reaction zone thus leading to a higher cell current density as compared to that of the serpentine flow field. The computations also indicate a need to account for water condensation and ensuing gas-liquid two-phase flow and transport in the porous cathode at high current densities. The present computer model can be used as a design or diagnostic tool for fuel cell cathodes with complex structural flow fields.

Fluid Dynamic Investigation of Channel Design in High Temperature PEM Fuel Cells

2012 ◽  
Vol 9 (2) ◽  
Author(s):  
G. Falcucci ◽  
E. Jannelli ◽  
M. Minutillo ◽  
S. Ubertini
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Gas Flow ◽  
Fluid Dynamic ◽  
Polymer Electrolyte Membrane ◽  
Three Dimensional ◽  
Active Surface ◽  
Pem Fuel Cells ◽  
Pressure Losses ◽  
Electrolyte Membrane

In this paper we analyze the three-dimensional flow field in anode and cathode gas channels of polymer electrolyte membrane (PEM) fuel cells operating at high temperature (T >100 °C). Different gas flow channel designs (pin-type, parallel channels, comb-tipe and multiple serpentine), as well as different channel sections (squared, trapezoidal and rounded with different curvature radii) are evaluated in function of some relevant parameters. The analysis is performed accounting for overall pressure losses, gas distribution over the electrode area and residence time with focus on channel hydraulic diameter, active surface ratio, gas path. Differences with low temperature (LT) PEM fuel cell design are also adressed. The investigation is conducted by means of 3D-CFD softwares and the results of our simulations are compared to experimental data in literature.

Three-Dimensional Simulations of Transient Response of PEM Fuel Cells

2007 ◽  
Author(s):  
Serhat Yesilyurt
Keyword(s):  
Fuel Cells ◽  
Gas Flow ◽  
Stokes Equations ◽  
Three Dimensional ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Load Pressure ◽  
Gas Diffusion Layers ◽  
Diffusion Layers ◽  
Flow Channels

Transients have utmost importance in the lifetime and performance degradation of PEM fuel cells. Recent studies show that cyclic transients can induce hygro-thermal fatigue. In particular, the amount of water in the membrane varies significantly during transients, and determines the ionic conductivity and the structural properties of the membrane. In this work, we present three-dimensional time-dependent simulations and analysis of the transport in PEM fuel cells. U-sections of anode and cathode serpentine flow channels, anode and cathode gas diffusion layers, and the membrane sandwiched between them are modeled using incompressible Navier-Stokes equations in the gas flow channels, Maxwell-Stefan equations in the channels and gas diffusion layers, advection-diffusion-type equation for water transport in the membrane and Ohm’s law for ionic currents in the membrane and electric currents in gas diffusion electrodes. Transient responses to step changes in load, pressure and the relative humidity of the cathode are obtained from simulations, which are conducted by means of a third party finite-element package, COMSOL.

Sign in / Sign up

Export Citation Format

Share Document