Numerical simulations of water droplet dynamics in hydrogen fuel cell gas channel

Kim, Hyo-Yup; Jeon, Se-Gye; Song, Myeongho; Kim, Kyoungyoun

doi:10.1016/j.jpowsour.2013.08.032

Cited by 46 publications

(19 citation statements)

References 21 publications

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“…However, A w can also decrease when the droplet adheres to the side or top wall of the channel (Figs. 5 and 6 of [12]). The time-averaged value of A w were 7.43% for the hydrophilic case, 7.23% for the hydrophobic case, and 4.90% for the hybrid case, thus confirming that the hybrid case was the most effective for fuel transport because it exhibited the least coverage on the GDL surface.…”

Section: Resultsmentioning

confidence: 97%

“…Cai et al [11] reported that a hydrophilic channel sidewall is effective in avoiding water accumulation on the MEA surface. Recently, Kim et al [12] also showed that droplets near a hydrophilic channel sidewall can be easily removed by corner flow along the top edge despite the reduced water discharge velocity, which results in the reduction of the GDL surface coverage by liquid water.…”

Section: Introductionmentioning

confidence: 99%

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Effects of hydrophilic/hydrophobic properties of gas flow channels on liquid water transport in a serpentine polymer electrolyte membrane fuel cell

Song

Kim

2014

International Journal of Hydrogen Energy

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Effects of hydrophilic/hydrophobic properties of gas flow channels on liquid water transport in a serpentine polymer electrolyte membrane fuel cell

Song

Kim

2014

International Journal of Hydrogen Energy

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“…As to the design of flow channels, the first aspect need to to be considered is the wettability of the channel walls . When the GDL surface is hydrophobic and the channel walls are hydrophilic, liquid water can be lifted onto the channel walls by capillary effect, detaching from the GDL surface , .…”

Section: Introductionmentioning

confidence: 99%

A Slope Right‐angle Turn Applied in the Flow Channel Promotes Water Management in Proton Exchange Membrane Fuel Cells

et al. 2018

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Effective water removal and transport in the flow field is significantly important to the critical water management in proton exchange membrane fuel cells (PEMFCs). In this work, a slope turn was proposed in the hydrophobic channel of the multi‐serpentine flow field, and the transport and dynamics of water in the modified flow channel were numerically investigated with the volume‐of‐fluid method. The simulation results indicated that, with the presence of the slope turn, the water droplet can be effectively detached from the surface of the gas diffusion layer although the channel walls are hydrophobic. Meanwhile, the hydrophobic channel walls are beneficial to decrease interfacial resistance of water transport, avoiding water accumulation in the flow channel. The wall contact angle, slope angle and gas flow velocity are three important factors which significantly affect water behavior and pressure drop in the flow channel. For considered cases in this work, the appropriate wall contact angle, slope angle, and gas flow velocity were proved to be 140°, 110°, and higher than 2 m s−1, respectively.

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“…Furthermore, numerical simulation technology is also adopted to study the evaporation and motion of droplets in different practical engineering situations. The effects of the channel geometry on the droplet dynamics in fuel cells had been numerically investigated (Zhu et al, 2010;Kim et al, 2014). Montazeri et al (2015a) found that a numerical simulation by a LagrangianEulerian approach could accurately predict droplet evaporation in evaporative cooling by water spray systems in outdoor and indoor urban environments, and the impact of physical parameters on evaporative cooling by a mist spray system were researched with CFD analysis (Montazeri et al, 2015b).…”

Section: Introductionmentioning

confidence: 99%

Evaporation and Movement of Fine Water Droplets Influenced by Initial Diameter and Relative Humidity

Wang

Yang

Zou

et al. 2016

Aerosol Air Qual. Res.

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Droplets generated in industrial buildings may do harm to the workers, the construction and the environment. Ventilation is often used to control this kind of air-borne contaminants. In order to provide a basis and reference for the efficient ventilation on droplets control, a numerical simulation method is adopted to reveal the evaporation and movement of fine water droplet populations released from a tank in industrial buildings. The variations of diameter and velocity of water droplets with identical initial diameter and velocity were studied. The results showed the evaporation and movement of the droplet populations presented obviously nonuniform distributions, due to vapor concentration and velocity distribution of the air around the droplets. When the droplets were closer to the centerline of the tank, they showed a lower evaporation rate, a larger velocity and a bigger velocity difference between droplets and its surrounding air. The effects of initial diameter and the relative humidity of the ambient air on droplet evaporation and movement were discussed. Compared to the relative humidity of the ambient air, the initial diameter had a more significant effect on the droplet evaporation and movement. The effects of the initial diameter variation (1 µm-50 µm) on the evaporation time variation and the terminal height variation were almost 17 times and 10 times larger than the effects by the relative humidity variation of the ambient air (20%-80%), respectively.

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Numerical simulations of water droplet dynamics in hydrogen fuel cell gas channel

Cited by 46 publications

References 21 publications

Effects of hydrophilic/hydrophobic properties of gas flow channels on liquid water transport in a serpentine polymer electrolyte membrane fuel cell

Effects of hydrophilic/hydrophobic properties of gas flow channels on liquid water transport in a serpentine polymer electrolyte membrane fuel cell

A Slope Right‐angle Turn Applied in the Flow Channel Promotes Water Management in Proton Exchange Membrane Fuel Cells

Evaporation and Movement of Fine Water Droplets Influenced by Initial Diameter and Relative Humidity

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