Numerical analysis of transient response in polymer electrolyte membrane fuel cell considering gas/liquid two phase flow

Hiromitsu Masuda, Kohei Ito, Yasushi Kakimoto, Kazunari Sasaki

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3 Citations (Scopus)

Abstract

It is important to elucidate the transient characteristics of polymer electrolyte membrane fuel cell (PEMFC), because it may be operated at a wide range of loads, and may have frequent starts and stops. In these unsteady conditions, the water management problem such as the flooding in cell and the drying of proton exchange membrane (PEM) tends to occur and degrades the performance of PEMFC. Based on these issues, a two dimensional, two-phase and transient numerical simulator for unit-PEMFC has been developed to study the transient characteristics of PEMFC. As for the gas/ liquid two-phase flow formulation in GDL. multiphase mixture model have been employed. In this study, we derived four time constants, which characterize the transient response of PEMFC. In addition, we numerically simulated the transient response of PEMFC to step-wise change of load current from 0.5 to 1.0 A/cm2 and succeeded to explain the transient response of cell voltage ( Vcell) by the four time constants. The results show that, just after the change of current, Vcell decreases by IR resistance in a moment, and then decreases in 10-1 s time-scale by the re-distribution of oxygen gas and by the charge of electric double layer capacitor. Then Vcell increases slightly in 101 s time-scale by wetting of PEM. Finally, V cell decreases again in 102 s time-scale by the development of liquid saturation in GDL.

Original languageEnglish
Pages (from-to)855-862
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume73
Issue number3
Publication statusPublished - Mar 2007

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transient response
Proton exchange membrane fuel cells (PEMFC)
two phase flow
Transient analysis
Two phase flow
fuel cells
numerical analysis
Numerical analysis
electrolytes
membranes
polymers
Liquids
liquids
Gases
gases
Ion exchange
Protons
time constant
Membranes
cells

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

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abstract = "It is important to elucidate the transient characteristics of polymer electrolyte membrane fuel cell (PEMFC), because it may be operated at a wide range of loads, and may have frequent starts and stops. In these unsteady conditions, the water management problem such as the flooding in cell and the drying of proton exchange membrane (PEM) tends to occur and degrades the performance of PEMFC. Based on these issues, a two dimensional, two-phase and transient numerical simulator for unit-PEMFC has been developed to study the transient characteristics of PEMFC. As for the gas/ liquid two-phase flow formulation in GDL. multiphase mixture model have been employed. In this study, we derived four time constants, which characterize the transient response of PEMFC. In addition, we numerically simulated the transient response of PEMFC to step-wise change of load current from 0.5 to 1.0 A/cm2 and succeeded to explain the transient response of cell voltage ( Vcell) by the four time constants. The results show that, just after the change of current, Vcell decreases by IR resistance in a moment, and then decreases in 10-1 s time-scale by the re-distribution of oxygen gas and by the charge of electric double layer capacitor. Then Vcell increases slightly in 101 s time-scale by wetting of PEM. Finally, V cell decreases again in 102 s time-scale by the development of liquid saturation in GDL.",
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AU - Masuda, Hiromitsu

AU - Ito, Kohei

AU - Kakimoto, Yasushi

AU - Sasaki, Kazunari

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AB - It is important to elucidate the transient characteristics of polymer electrolyte membrane fuel cell (PEMFC), because it may be operated at a wide range of loads, and may have frequent starts and stops. In these unsteady conditions, the water management problem such as the flooding in cell and the drying of proton exchange membrane (PEM) tends to occur and degrades the performance of PEMFC. Based on these issues, a two dimensional, two-phase and transient numerical simulator for unit-PEMFC has been developed to study the transient characteristics of PEMFC. As for the gas/ liquid two-phase flow formulation in GDL. multiphase mixture model have been employed. In this study, we derived four time constants, which characterize the transient response of PEMFC. In addition, we numerically simulated the transient response of PEMFC to step-wise change of load current from 0.5 to 1.0 A/cm2 and succeeded to explain the transient response of cell voltage ( Vcell) by the four time constants. The results show that, just after the change of current, Vcell decreases by IR resistance in a moment, and then decreases in 10-1 s time-scale by the re-distribution of oxygen gas and by the charge of electric double layer capacitor. Then Vcell increases slightly in 101 s time-scale by wetting of PEM. Finally, V cell decreases again in 102 s time-scale by the development of liquid saturation in GDL.

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