Visualization study on the dynamics of CO2 bubbles in anode channels and performance of a DMFC

Liu, Qiang; Zhu, Xun; Xue-yan, Zheng; Ding, Yulong

doi:10.1016/j.jpowsour.2007.06.257

Cited by 80 publications

(35 citation statements)

References 27 publications

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“…This finding was in agreement with that reported in Ref. [4]. Furthermore, as the mass flow rate of the methanol solution increased to 10 sccm, CO 2 bubbles were found to be discretely distributed, and the coalescence of …”

Section: Effect On Methanol Solution Flow Rate Of Different Channel Wsupporting

confidence: 93%

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Performance Tests and Pressure Drop Measurements in the Anode Flowfield of a μDMFC

Hsieh

Chen

2010

Fuel Cells

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Cell performance tests and measurements of the pressure drops in the anode flow channels of a custom‐made microdirect methanol fuel cell (μDMFC) are conducted and studied for different methanol concentrations (0.5–2 M), flow rates (10–20 sccm) and operating temperatures (40–80 °C). The anode flowfields consist of three channel/four pass flow channels with widths of 500–2000 μm and a total length of 300–400 mm. Moreover, flow characteristics of the CO2 gas bubbles and methanol solution in the anode flow channels are identified and analysed for CO2 fraction through visualisation. Finally, an optimal channel size for the present μDMFC is obtained.

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Section: Effect On Methanol Solution Flow Rate Of Different Channel Wsupporting

confidence: 93%

“…However, only a few research works have touched on this topic [4]. In addition, the visualisation resolution as reported has been somewhat inadequate.…”

Section: Introductionmentioning

confidence: 99%

Performance Tests and Pressure Drop Measurements in the Anode Flowfield of a μDMFC

Hsieh

Chen

2010

Fuel Cells

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“…Lu and Wang [5] investigated the effects of pore structure and wettability on two-phase flow dynamics. Liao et al [11] investigated the dynamic behavior of CO2 gas bubbles in a 9 cm 2 transparent direct methanol fuel cell (DMFC). A series of parametric studies were carried out to evaluate the effects on the CO2 gas bubbles dynamics as well as the cell performance.…”

Section: Introductionmentioning

confidence: 99%

Visual study of CO2 bubble behavior in anode flow field of direct methanol fuel cell at ambient temperature

Cao¹,

Gao²,

Meng³

2017

2nd Annual International Conference on Energy, Environmental &Amp; Sustainable Ecosystem Development (EESED 2016)

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This paper reports on a visual study of the CO2 bubble behavior in the anode flow field of a transparent Direct Methanol Fuel Cell (DMFC) with interdigitated flow field (IFF), working at ambient temperature. In the IFF, the quantity of CO2 bubbles increased with the increase of current densities. At low current densities, bubble flow appeared in the anode flow field and channel-blocking phenomenon caused by CO2 gas bubbles was found in the inlet channels; at moderate current densities, a number of gas slugs formed, and then bubbly flow and slug flow coexisted in the flow field; at high current densities, channel-blocking phenomenon also appeared in outlet channels. As the methanol flow rates increased, the amount of the CO2 bubbles decreased, enhancing the mass transport process of methanol and hence, improved the limiting current. However, higher methanol flow rate led to an increase of methanol crossover and to take away more heat. This eventually, resulted in a deterioration of cell performance.

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“…Yang et al observed channel-filling slugs and found that higher flow rates of methanol solution can reduce the average length and number of gas slugs [4]. Liao and coauthors found that the growth and coalescence of CO 2 gas bubbles may lead to gas slugs blocking both in flow field channels and the porous diffusion layer [5]. A similar experiment was also conducted by Wong et al They reported that a smaller flow channel would cause the cell decline in performance because of transient capillary blocking [6].…”

Section: Introductionmentioning

confidence: 99%

Novel Flow Field with Superhydrophobic Gas Channels Prepared by One-step Solvent-induced Crystallization for Micro Direct Methanol Fuel Cell

Liang

Liu

et al. 2015

Nano-Micro Lett.

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The CO 2 -induced capillary blocking in anode flow field is one of the key adverse factors to reduce the performance of a micro-direct methanol fuel cell (lDMFC). In order to solve this problem, new polycarbonate (PC) flow field plates with nested arrangement of hydrophilic fuel channels and superhydrophobic gas channels were designed, fabricated, and tested in this work. The gas channels were treated with solvent-induced crystallization using acetone solution. The superhydrophobicity with 160°water contact angle and 2°tilting angle was obtained on the PC substrates. A dummy cell using hydrogen peroxide decomposition reaction and a test loop were separately set up to evaluate the flow fields' performance. It was found that a 37 % pressure drop decrease can be obtained in the new serpentine flow field compared with that of the conventional one. The benefit of the new flow field to remove gas bubbles was also confirmed by an in situ visualization study on the dummy cell. Results show that the auxiliary superhydrophobic gas channels can speed up the discharge of the gas bubbles from the flow field, which will in turn improve the lDMFC performance.

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Visualization study on the dynamics of CO2 bubbles in anode channels and performance of a DMFC

Cited by 80 publications

References 27 publications

Performance Tests and Pressure Drop Measurements in the Anode Flowfield of a μDMFC

Performance Tests and Pressure Drop Measurements in the Anode Flowfield of a μDMFC

Visual study of CO2 bubble behavior in anode flow field of direct methanol fuel cell at ambient temperature

Novel Flow Field with Superhydrophobic Gas Channels Prepared by One-step Solvent-induced Crystallization for Micro Direct Methanol Fuel Cell

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