Gas-flow uniformity and cell performance in a molten carbonate fuel cell stack

Hirata, Haruhiko; Hori, Michio

doi:10.1016/s0378-7753(96)02459-7

Cited by 25 publications

(7 citation statements)

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“…Due to the small volume of a single channel, many parallel channels have to be used to obtain sufficient production, which makes uniform distribution of the reaction mixture over thousands or even millions of channels necessary [11]. Since flow maldistribution can affect the reactor performance [12,13], several authors have presented design studies of flow distribution manifolds [14±17]. However, besides the design of the flow distributor, also manufacturing tolerances on, for example, the diameter of the microchannels and the applied amount of catalyst coating and issues like channel blockage influence the flow distribution [8,18].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Differences Between Microchannels on Micro Reactor Performance

et al. 2005

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Microstructured reactors most often contain a large number of micrometer-sized, parallel channels, instead of a large undivided reaction volume. Individual microchannels behave as plug-flow reactors without significant axial dispersion and with excellent heat and mass transfer properties. However, since the reaction takes place in a large number of parallel channels, it is important that all channels provide equal residence time and amount of catalyst volume. These issues depend not only on the flow distributor design, but also, for example, on the manufacturing tolerances. Correlations are derived to express the conversion of a multichannel microreactor explicitly as a function of the variance of a number of reactor parameters, viz. the channel flow rate, the channel diameter, the amount of catalyst in a channel, and the channel temperature. It is shown that the influence of flow maldistribution on the overall reactor conversion is relatively small, while the influences of variations in the channel diameter and the amount of catalyst coating are more pronounced. The model outcomes are also compared to experimental results of two microreactors with different catalyst distributions, which show that the presented method is able to provide a quick, though rough estimation of the influence of differences between channels on microreactor performance.

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Section: Introductionmentioning

confidence: 99%

The Influence of Differences Between Microchannels on Micro Reactor Performance

et al. 2005

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“…The analysis features about the heat transfer and gas flow in the stack are the same as those of the code for MCFC [8], and the functions of the water evaporation and condensation have been added based on the code for PAFC [7], and function of the electrode reaction has been modified to simulate the PEMFC.…”

Section: Analysis Methodsmentioning

confidence: 99%

Numerical study on the cathode flooding of direct humidified proton exchange membrane fuel cell

Hirata

Shimotori

Aoki

2012

Journal of Power Sources

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“…Appropriate thermal conductance and/or the flow resistance are assigned to each element. Hirata and Hori [2] examined the effects of gas-flow uniformity on the cell performance. Yoshiba et al [3,4] compared MCFC stack performance for various gas-flow types and identified the cause of the anomaly in voltage distribution within each cell.…”

Section: Introductionmentioning

confidence: 99%