Gas flow field with obstacles for PEM fuel cells at different operating conditions

Bilgili, Muhittin; Bosomoiu, Magdalena; Tsotridis, Georgios

doi:10.1016/j.ijhydene.2014.11.139

Cited by 75 publications

(26 citation statements)

References 19 publications

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“…Equation is the continuity equation where the calculate method of mixture density is provided in Equation . The source terms for the consumption of hydrogen, oxygen and the creation of water can be calculated by Equations , , and , respectively

\nabla \cdot ((), ρ \overset{u}{true}) = S_{{normalH}_{2}} + S_{O_{2}} + S_{H_{2} O},

ρ_{mix} = \frac{P}{italicRT \sum \frac{Y_{i}}{M_{i}}},

S_{H_{2}} = - \frac{J_{italican}}{2 F} M_{H_{2}},

S_{O_{2}} = - \frac{J_{italicca}}{4 F} M_{O_{2}},

S_{H_{2} O} = + \frac{J_{italicca}}{2 F} M_{H_{2} O} .

…”

Section: Computational Detailsmentioning

confidence: 99%

The energy performance improvement of a PEM fuel cell with various chaotic flowing channels

et al. 2019

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Summary To improve the energy performance of a proton exchange membrane fuel cell (PEMFC), novel chaotic structures are proposed and numerically evaluated for replacing straight types in the serpentine gas diffusion flow channels. The numerical model is verified by the available experimental data. Nine cases (chaotic channels, Cases A2, B1, B2, C1, C2, D1, D2, E1, and E2) and a baseline case (straight flow channel, Case A1) are evaluated, and the detailed temperature and the flow characteristics are presented and analyzed. The influences of the main design parameters including the corner angle, bends number, and datum surface number are also analyzed and concluded. It is found that the newly proposed chaotic structures can improve not only the temperature uniformity, but also the maximum output power and the energy efficiency of the PEMFC. Compared with a traditional PEMFC, the power output of the new PEMFCs with chaotic flowing channels can be improved by 6.26% and the efficiency of PEMFC can be promoted by 8.40%.

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\nabla \cdot ((), ρ \overset{u}{true}) = S_{{normalH}_{2}} + S_{O_{2}} + S_{H_{2} O},

ρ_{mix} = \frac{P}{italicRT \sum \frac{Y_{i}}{M_{i}}},

S_{H_{2}} = - \frac{J_{italican}}{2 F} M_{H_{2}},

S_{O_{2}} = - \frac{J_{italicca}}{4 F} M_{O_{2}},

S_{H_{2} O} = + \frac{J_{italicca}}{2 F} M_{H_{2} O} .

…”

Section: Computational Detailsmentioning

confidence: 99%

The energy performance improvement of a PEM fuel cell with various chaotic flowing channels

et al. 2019

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“…Burada yer kısıtlamasından dolayı bütün denklemler verilememiştir. Denklemlerin detaylı hali [11]'den görülebilir.…”

Section: Yakıt Pili Tasarımı (Design Of Fuel Cell)unclassified

İki Hücreli PEM Yakıt Pili Yığının Sayısal Analizi

Bilgili

2019

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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In this study, PEM fuel cell stack is analyzed by numerically. By using the same cell dimensions, electrochemical and physical properties at each layer of the cell, a PEM fuel cell stack is designed and prepared. Each cell has 5.4 cm 2 active area and connected in series. Reactants of anode and cathode flow direction is preferred parallel. PEM fuel cells are accepted as operating conditions of 70 o C and 1 atm. Polarization curves and electrical power curves are obtained for different current densities values of single and stack of PEMFC. Figure A. Electrical power curves corresponding to current density for single and two cellsPurpose: In this study, single and two unit PEM fuel cell stack are analyzed numerically and electrical power values calculated. Thereby it is observed that number of fuel cell units effects on the electrical power. It is also obtained how effectively increasing electrical power for two different number of fuel cell unit. Theory and Methods:In this study, PEMFC single cell and stack models has been designed by CATIA V5R21. These designed cell models were analyzed for single and stack cell using ANSYS FLUENT. Results:The maximum electrical power values obtained from two cells stack and single cell were calculated as 11.32 W and 6.26 W, respectively. It is observed when the number of units in the PEMFC is increased, it is attained more electrical power nearly at the same range. Reasons of the losses in the electrical power are estimated as friction, ohmic losses or rising of fluid cover distance. Conclusion:Design and analysis of one and two units PEMFC are investigated in this study. And it has been observed when the cell number is increased from one to two cells, electrical power is increased about the same amount. Moreover, the distribution of reactants in the channels, temperature distributions, current density distributions and water saturation at selected cross sectional area for a two units fuel cell stack is analyzed at the different voltage values.

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“…Bilgili et al [90] conducted a three-dimensional computational model at different operating conditions of stoichiometry, relative humidity, and temperature to explore the performance of a PEM fuel cell including rectangular obstacles with constant height and length of the obstacle in the flow channels of anode and cathode. Their results indicated that the obstacles within the gas flow channels promote the concentration distribution across the channels and the transport of the reactant gases past the gas diffusion layer.…”

Section: External Additions In the Channelmentioning

confidence: 99%

A review of recent development: Transport and performance modeling of PEM fuel cells

2016

Applied Energy

359

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Gas flow field with obstacles for PEM fuel cells at different operating conditions

Cited by 75 publications

References 19 publications

The energy performance improvement of a PEM fuel cell with various chaotic flowing channels

The energy performance improvement of a PEM fuel cell with various chaotic flowing channels

İki Hücreli PEM Yakıt Pili Yığının Sayısal Analizi

A review of recent development: Transport and performance modeling of PEM fuel cells

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