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CO2 bubble behaviors and two-phase flow characteristics in single-serpentine sinusoidal corrugated channels of direct methanol fuel cell
- Source :
- Journal of Power Sources. 450:227621
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Management of the produced carbon dioxide (CO2) is important to improve the performance of a liquid-feed direct methanol fuel cell (DMFC). This work investigates the CO2 bubble behaviors and the two-phase flow characteristics, using a single sinusoidal corrugated channel as the anode flow field. The magnitude and gradient of the fluid velocity in this channel is higher than the traditional straight pattern, as proven by tracking CO2 bubbles. The use of high magnitude and gradient of velocity enhances CO2 emission and fuel delivery, as well as increases the pressure drop. The vortices in the disturbance structure of the corrugated channel help uniformly deliver the reactants and separate bubbles away from the channel wall. Using excessive values of amplitude A and angular frequency W in the corrugated channel causes serious bubble deformation and extra energy consumption. The effect of disturbance structure is negligible with small values of these two parameters. The cell with a corrugated channel shows a higher performance at different feed rates and concentrations of the methanol fuel. The optimal value of A and W are respectively 0.1and 5. The visualization tests demonstrate that the appearance of CO2 bubbles in the corrugated channel is consistent with the simulation results.
- Subjects :
- Pressure drop
Materials science
Renewable Energy, Sustainability and the Environment
Bubble
Flow (psychology)
Energy Engineering and Power Technology
02 engineering and technology
Mechanics
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Vortex
Physics::Fluid Dynamics
Direct methanol fuel cell
Flow velocity
Two-phase flow
Electrical and Electronic Engineering
Physical and Theoretical Chemistry
0210 nano-technology
Methanol fuel
Subjects
Details
- ISSN :
- 03787753
- Volume :
- 450
- Database :
- OpenAIRE
- Journal :
- Journal of Power Sources
- Accession number :
- edsair.doi...........67973c596fe6bbe8d4e35fc58d9b3958