Computational Fluid Dynamics of Water Droplet Formation and Detachment from Gas Diffusion Layer

2012 ◽  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Diffusion Layer ◽  
Water Droplet ◽  
Gas Diffusion Layer ◽  
Droplet Formation ◽  
Gas Diffusion

Measurements of Water Droplet Behavior in Gas Diffusion Layer of PEFC using X-Ray CT and Substance Microscope

2019 ◽  
Vol 16 (24) ◽  
pp. 133-140
Author(s):  
Ippei Suzuma ◽  
Eiji Ejiri ◽  
Masaki Hirono ◽  
Masato Takimoto ◽  
Masakazu Yoneda
Keyword(s):  
Diffusion Layer ◽  
Water Droplet ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
X Ray ◽  
Droplet Behavior

scholarly journals Ex-situ characterisation of water droplet dynamics on the surface of a fuel cell gas diffusion layer through wettability analysis and thermal characterisation

2017 ◽  
Vol 42 (7) ◽  
pp. 4404-4414 ◽  
Author(s):  
Oluwamayowa A. Obeisun ◽  
Donal P. Finegan ◽  
Erik Engebretsen ◽  
James B. Robinson ◽  
Oluwadamilola O. Taiwo ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Diffusion Layer ◽  
Water Droplet ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Ex Situ ◽  
Droplet Dynamics

Estimation of Flooding in PEMFC Gas Diffusion Layer by Differential Pressure Measurement

2006 ◽  
Author(s):  
Kohei Ito ◽  
Kensuke Ashikaga ◽  
Tomohiko Miyazaki ◽  
Hiroki Ohshima ◽  
Yasushi Kakimoto ◽  
...  
Keyword(s):  
Diffusion Layer ◽  
Pressure Measurement ◽  
Water Droplet ◽  
Optimization Design ◽  
Water Saturation ◽  
Gas Diffusion Layer ◽  
Packed Bed ◽  
Gas Diffusion ◽  
Differential Pressure ◽  
Impedance Method

The flooding, especially in gas diffusion layer (GDL), is one of the critical issues to put PEMFC to practical use. However, the experimental data of the flooding in GDL is so insufficient that the optimization design to solve the flooding problem in GDL has not established until now. In this study we show a method to estimate the water saturation, namely the water droplet occupation for unit volume in GDL. We fabricated a simple interdigitated cell where the supply gas is enforced to flow under rib. This structure made it possible to capture the water droplet in GDL with the measurement of differential pressure through the cell. We operated the cell and measured the differential pressure, and estimated the water saturation with assuming that the flow in GDL is Darcy flow and that the GDL can be treated as sphere packed bed. In addition to deferential pressure measurement, we measured the ionic resistance in polymer electrolyte membrane by AC impedance method. We evaluated the effect of the water saturation on the decrease of cell voltage.

scholarly journals Measurements of water droplet behavior inside gas diffusion layer of PEFC

2008 ◽  
Vol 28-1 (2) ◽  
pp. 1101-1101
Author(s):  
Masaki HIRONO ◽  
Ippei SUZUMA ◽  
Eiji EJIRI ◽  
Masato TAKIMOTO ◽  
Masakazu YONEDA
Keyword(s):  
Diffusion Layer ◽  
Water Droplet ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Droplet Behavior

A Review of Models for Water Droplet Detachment From the Gas Diffusion Layer-Gas Flow Channel Interface in PEMFCs

2007 ◽  
Author(s):  
Charles H. Schillberg ◽  
Satish G. Kandlikar
Keyword(s):  
Diffusion Layer ◽  
Water Droplet ◽  
Gas Flow ◽  
Proton Exchange Membrane ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Channel Length ◽  
Flow Channel ◽  
Proton Exchange ◽  
Droplet Detachment

Understanding the fundamental mechanisms of water transport in proton exchange membrane fuel cells (PEMFCs) is necessary for effective management of product water. Among the transport mechanisms affecting the performance of PEMFCs are droplet formation, growth, and detachment at the gas diffusion layer (GDL)-gas flow channel interface. The presence of water droplets on the GDL blocks the access of gases to the reaction sites, increases channel pressure drop, and creates inconsistencies in the gas velocity fields down the channel length, all resulting in performance deterioration. In order to gain an insight into controlling droplets, an in-depth review of PEMFC water droplet detachment models published in the literature is presented here. Summaries of supporting data, modeling techniques, and conclusions are also presented.

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