effect of gas diffusion layer properties on water distribution across

Effect of gas diffusion layer properties on water distribution

2016/9/1Effect of gas diffusion layer properties on water distribution across air-cooled, open-cathode polymer electrolyte fuel cells: A combined ex-situ X-ray tomography and in-operando neutron imaging studyFirst description of water distribution using in-plane neutron

THE EFFECT OF GAS DIFFUSION ON BUBBLE DYNAMICS

Figure 2: Effect of Gas Mass on Mean Bubble Radius As the mass of gas inside the bubble is changed by gas dif-fusion, diffusion processes around the bubble are most im-portant for the mean bubble size and the bubble dynamics. The time dependent progress of

Effect of diffusion

The gas-diffusion layer (GDL) influences the performance of electrodes employed with polymer electrolyte fuel cells (PEFCs). A simple and effective method for incorporating a porous structure in the electrode GDL using sucrose as the pore former is reported. Optimal (50 w/o) incorporation of a pore former in the electrode GDL facilitates the access of the gaseous reactants to the catalyst

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Liquid water blocks reactant transport through the based on two-phase Darcy's law to investigate liquid water gas diffusion layer (GDL), and incurs mass transport losses by transport in PEFC. These models cannot incorporate the hindering oxygen transport to the active reaction sites in the - GDL morphology and require material-specific capillary alyst layer (CL).

International Journal of Heat and Mass Transfer

CL catalyst layer DM diffusion media GDL gas diffusion layer MPL micro-porous layer PEM proton exchange membrane Fig. 1. Cross-section of a polymer electrolyte fuel cell (microscopic image courtesy of ZSW Ulm). J. Becker et al./International Journal of

(PDF) Effective

Its porosity and pore-size distribution are designed for the desired gas diffusion and water management, while the carbon fibers provide the required electrical/thermal conduction. The presence of the carbon fibers hinders the gas diffusion by increasing the tortuosity or gas-transport path length (the degree of the meandering diffusion pathways).

Measurement of Gas Diffusion Coefficient in Highly

In high‐permeability aggregated soils, gas transport drives various processes, including aeration of the root zone (Kawamoto et al., 2006), volatilization of organic chemicals (Aachib et al., 2004), and water vapor diffusion (e.g., Ross, 1984).

Effect of Gas Diffusion Layer Surface Wettability Gradient

Malhotra, S., and Ghosh, S. (April 19, 2018). Effect of Gas Diffusion Layer Surface Wettability Gradient on Water Behavior in a Serpentine Gas Flow Channel of Proton Exchange Membrane Fuel Cell. ASME. J. Fluids Eng.August 2018; 140(8): 081302. https://doi

EFFECT OF TEMPERATURE ON WATER VAPOR TRANSPORT

The intrinsic water vapor diffusion resistance increases at lower temperatures, which lowers the rate at which water vapor is transported across the layer. CO CO HI E E, u c o D DC c g 3 -10 0 Temperature [ C] 20 Figure 1. Change in Water Vapor

THERMAL CONDUCTIVITY AND CONTACT RESISTANCE OF COMPRESSED GAS DIFFUSION LAYER

Distribution of the printed publication Internet access (URL) Iwao Nitta, Olli Himanen Mikko Mikkola This paper discusses the effect of compression pressure on the mechanical and thermal properties of gas diffusion layers (GDL).

Effect of gas diffusion layer properties on water distribution across

1 Effect of gas diffusion layer properties on water distribution across air-cooled, open-cathode polymer electrolyte fuel cells: a combination of ex-situ X-ray tomography and in-situ neutron imaging. Quentin Meyer1, Sean Ashton2, Pierre Boillat3,4, Magali Cochet3, Erik Engebretsen1,

Gas Diffusion Layer: Characteristics and Modeling

The typical gas diffusion layer has pores between 0.5 and 20 μm in radius, and a microporous layer contains pores between S0.05 and 2. Therefore, depending upon the material used, Knudsen diffusion may not have to be considered in gas diffusion layers, but it should be accounted for in microporous and catalyst layers .

Analysis of thermal and water management with temperature

the effect of electro-osmosis, diffusion of water; heat trans-fer from solid phase to gas phase and latent heat as water evaporation and condensation. It was found that the ohmic loss is noticeable at high current density. The voltage loss is twice amount of that at

(PDF) Innovative gas diffusion layers and their water

Numerical investigations on liquid water removal from the porous gas diffusion layer by reactant flow By Xianguo Li Two-phase flow in GDL and reactant channels of a proton exchange membrane fuel cell By Satish Kandlikar Water transport in polymer electrolyte

(PDF) Liquid water transport in a mixed

However, the effect of mixed wettability on phase distribution was not addressed in detail.The present study aims to address the effect of mixed wettability on liquid water distribution in a GDL, and to answer the following questions:(1) How does the co-existence

Characteristics of Boron Diffusion in Polysilicon/Silicon Systems with a Thin Si

boron diffusion profiles in the polysilicon/silieon system by using a thin Si-B layer as diffusion source. Experimental The substrates used in this experiment were n-type, (I00) Si wafers with a resistivity of 0.5 to 2 O-cm. Prior to

Channel intrusion of gas diffusion media and the effect on fuel

Available online at Journal of Power Sources 184 (2008) 120–128 Channel intrusion of gas diffusion media and the effect on fuel cell performance Yeh-Hung Lai∗, Pinkhas A. Rapaport, Chunxin Ji, Vinod Kumar Fuel Cell Activities, General

Effect of the Micro

High-resolution through plane neutron radiography is used to acquire the water content distribution across the thickness of the gas-diffusion layer and study the effects of the interface. The measured liquid water profiles indicate no obvious discontinuity in the liquid water saturation across the cross-section of the bi-layer gas diffusion layer when large areas are averaged spatially.

The Effect of Relative Humidity on Binary Gas Diffusion

The dependence of diffusion coefficient of O2−N2 mixture in the presence of water vapor was experimentally determined as a function of relative humidity (RH) with different temperatures using an in-house made Loschmidt diffusion cell. The experimental results showed that O2−N2 diffusion coefficient increased more than 17% when RH increased from 0% to 80% at 79 C. In the experiments, the

GAS DIFFUSION LAYER AND REACTANT GAS CHANNEL

3 Gas diffusion layer and reactant gas channel influence on performance of HT-PEM fuel cell 1237 Fig. 1 – 3D HT-PEMFC computational model geometry. Porous gas diffusion layers (GDLs) and electrode flow can be given by a similar set of differential equations

GAS DIFFUSION LAYER AND REACTANT GAS CHANNEL

Study for the Characteristics of the Gas Diffusion Layers

The PEMFC use a gas diffusion layer(GDL) to distribute reactants to anode and cathode at areas that are orthogonal to the bulk flow but parallel to the membrane. This distribution is necessary because most flow field designs use ribs that separate the flow channels to provide lectrical contact between the current collectors and electrodes.

EFFECT OF PEM FUEL CELLS GAS DIFFUSION LAYER COMPRESSION ON IN

water and/or the condensed water from humidiﬁed reactants ﬁlls the open pores of the GDL and prevents a uniform distribution of reactants across electrodes. This eventually lowers the perfor-mance of the cell and should be carefully avoided [3–5]. Fur-thermore, the

Effect of Gas Diffusion Layer Surface Wettability Gradient

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Estimation of Gas Transport across Gas Diffusion Layers with the Presence of Liquid Water

Estimation of Gas Transport across Gas Diffusion Layers with the Presence of Liquid Water Author: Ryan Bowe March 6, 2020 This report represents work of WPI undergraduate students submitted to the faculty as evidence of a degree requirement. WPI routinely

(PDF) Liquid water transport in a mixed

Effect of gas diffusion layer properties on water distribution

T1 - Effect of gas diffusion layer properties on water distribution across air-cooled, open-cathode polymer electrolyte fuel cells: A combined ex-situ X-ray tomography and in-operando neutron imaging study AU - Meyer, Q. AU - Ashton, S. AU - Boillat, P.