This paper presents the bubble transport phenomenon at the anode of a micro direct methanol fuel cell (μDMFC) from a messooscopic viewpoint. Carbon dioxide bubbles generated at the anode may block part of the catalyst/diffusion layer and also the flow channels that cause the μDMFC malfunction. Lattice-Boltzmann methods (LBM) were employed in this paper to simulate the two phase flow in a simplified micro channel which emulates the bubble dynamics in the porous diffusion layer and the flow channel. A two-dimensional, nine velocity model (D2Q9) was established. The surface tension, buoyancy force were treated as source terms in the momentum equation. Bounce back boundary conditions were assumed at the fluid-solid interface in this model. Simulation results and parametric studies showed that the pore size, the stream flow rate and the hydrophilic effect between the fluid and the solid wall play the major roles in the bubble dynamics. Larger pore size, higher methanol stream flow rate and greater hydrophilicity are preferred for bubble removal at the anode diffusion layer and also the flow channels.
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ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology
May 23–25, 2005
Ypsilanti, Michigan, USA
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-3764-5
PROCEEDINGS PAPER
Lattice Boltzmann Simulations of Bubble Dynamics at the Anode of a µDMFC
Kai Fei,
Kai Fei
National Tsing Hua University, Hsinchu, Taiwan
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Chin-Hsien Cheng,
Chin-Hsien Cheng
National Tsing Hua University, Hsinchu, Taiwan
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Che-Wun Hong
Che-Wun Hong
National Tsing Hua University, Hsinchu, Taiwan
Search for other works by this author on:
Kai Fei
National Tsing Hua University, Hsinchu, Taiwan
Chin-Hsien Cheng
National Tsing Hua University, Hsinchu, Taiwan
Che-Wun Hong
National Tsing Hua University, Hsinchu, Taiwan
Paper No:
FUELCELL2005-74070, pp. 9-14; 6 pages
Published Online:
October 13, 2008
Citation
Fei, K, Cheng, C, & Hong, C. "Lattice Boltzmann Simulations of Bubble Dynamics at the Anode of a µDMFC." Proceedings of the ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology. 3rd International Conference on Fuel Cell Science, Engineering and Technology. Ypsilanti, Michigan, USA. May 23–25, 2005. pp. 9-14. ASME. https://doi.org/10.1115/FUELCELL2005-74070
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