All-angle removal of CO2 bubbles from the anode microchannels of a micro fuel cell by lattice-Boltzmann simulation

Fei, K.; Hong, Chin-Nan

doi:10.1007/s10404-006-0107-6

Cited by 28 publications

(12 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fei, K. and C.W. Hong, 2006 99 simulated the effect of inclination angle on microchannel fuel cell system. They reported that the change of inclination angle has a direct effect on bubbles velocity inside the cell.…”

Section: Bubbles Management By Cell Componentsmentioning

confidence: 99%

Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

Taqieddin

Nazari

Rajić

et al. 2017

J. Electrochem. Soc.

116

View full text Add to dashboard Cite

Electrochemical systems suffer from poor management of evolving gas bubbles. Improved understanding of bubbles behavior helps to reduce overpotential, save energy and enhance the mass transfer during chemical reactions. This work investigates and reviews the gas bubbles hydrodynamics, behavior, and management in electrochemical cells. Although the rate of bubble growth over the electrode surface is well understood, there is no reliable prediction of bubbles break-off diameter from the electrode surface because of the complexity of bubbles motion near the electrode surface. Particle Image Velocimetry (PIV) and Laser Doppler Anemometry (LDA) are the most common experimental techniques to measure bubble dynamics. Although the PIV is faster than LDA, both techniques are considered expensive and time-consuming. This encourages adapting Computational Fluid Dynamics (CFD) methods as an alternative to study bubbles behavior. However, further development of CFD methods is required to include coalescence and break-up of bubbles for better understanding and accuracy. The disadvantages of CFD methods can be overcome by using hybrid methods. The behavior of bubbles in electrochemical systems is still a complex challenging topic which requires a better understanding of the gas bubbles hydrodynamics and their interactions with the electrode surface and bulk liquid, as well as between the bubbles itself.

show abstract

Section: Bubbles Management By Cell Componentsmentioning

confidence: 99%

Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

Taqieddin

Nazari

Rajić

et al. 2017

J. Electrochem. Soc.

116

View full text Add to dashboard Cite

show abstract

“…Together with the liquid methanol-water solution a two-phase flow forms which exhibits a slug/intermittent flow pattern for most current densities of interest. Fei et al (2006) and Fei and Hong (2007) investigated the bubble transport in a micronsized channel by a 2D LB method. In a follow-up paper, they studied heat transfer including Marangoni effects due to a temperature dependent surface tension and found that bubbles moved more rapidly in a divergent microchannel than in a straight or convergent channel (Fei et al 2008).…”

Section: Marangoni Effects and Surfactantsmentioning

confidence: 99%

Numerical modeling of multiphase flows in microfluidics and micro process engineering: a review of methods and applications

Wörner

2012

Microfluid Nanofluid

370

197

View full text Add to dashboard Cite

This article presents a comprehensive review of numerical methods and models for interface resolving simulations of multiphase flows in microfluidics and micro process engineering. The focus of the paper is on continuum methods where it covers the three common approaches in the sharp interface limit, namely the volumeof-fluid method with interface reconstruction, the level set method and the front tracking method, as well as methods with finite interface thickness such as color-function based methods and the phase-field method. Variants of the mesoscopic lattice Boltzmann method for two-fluid flows are also discussed, as well as various hybrid approaches. The mathematical foundation of each method is given and its specific advantages and limitations are highlighted. For continuum methods, the coupling of the interface evolution equation with the single-field Navier-Stokes equations and related issues are discussed. Methods and models for surface tension forces, contact lines, heat and mass transfer and phase change are presented. In the second part of this article applications of the methods in microfluidics and micro process engineering are reviewed, including flow hydrodynamics (separated and segmented flow, bubble and drop formation, breakup and coalescence), heat and mass transfer (with and without chemical reactions), mixing and dispersion, Marangoni flows and surfactants, and boiling.

show abstract

“…We constructed mathematical models using a thermal lattice-Boltzmann method (TLBM) to observe the phenomenon of CO 2 bubbles in the anode microchannel of a lDMFC. The main focus of this research is on the thermal and geometric effects of the microchannel flow from a microfluidic viewpoint, the hydrophilic effect was inherited from the original latticeBoltzmann method in our previous publications (Fei et al 2006;Fei and Hong 2007). The thermal effect influences the bubble transport significantly because the surface tension of a gas bubble depends on temperature.…”

Section: Introductionmentioning

confidence: 99%

“…2 Thermal lattice-Boltzmann method Details of a 2D, nine-velocity (D2Q9) lattice-Boltzmann model for a two-phase flow, including the treatment of boundary conditions, were explicitly described in our previous work (Fei et al 2006;Fei and Hong 2007). We derived the lattice-Boltzmann model from the physicallyoriented concept proposed by Shan and Chen (1993).…”

Section: Introductionmentioning

confidence: 99%

Microfluidic analysis of CO2 bubble dynamics using thermal lattice-Boltzmann method

Fei

Chen

Hong

2007

Microfluid Nanofluid

Self Cite

View full text Add to dashboard Cite

By means of microfluidic analysis with a thermal lattice-Boltzmann method, we investigated the hydrophilic, thermal and geometric effects on the dynamics of CO 2 bubbles at anode microchannels (e.g., porous layers and flow channels) of a micro-direct methanol fuel cell. The simulation results show that a more hydrophilic wall provides an additional attractive force to the aqueous methanol in the flow direction and that moves the CO 2 bubble more easily. The bubble propagates quicker in the microchannel with a positive temperature gradient imposed from the inlet to the exit, mainly due to the Marangoni effect. Regarding the geometric effect of the microchannel, the bubble moves more rapidly in a divergent microchannel than in a straight or convergent channel. On the basis of the quantitative evaluation of hydrophilic, thermal and geometric effects, we are able to design the bubble-removal technique in micro fuel cells.Keywords Thermal lattice-Boltzmann method Á Bubble dynamics Á Two-phase flow Á Micro-direct methanol fuel cell List of symbols e lattice velocity vector e lattice speed (cm/s) f density distribution function (g/cm 3 ) g thermal distribution function (g K/cm 3 ) G rr 0 interaction strength between the species r and the other species r 0 (cm 3 /g s)

show abstract

All-angle removal of CO2 bubbles from the anode microchannels of a micro fuel cell by lattice-Boltzmann simulation

Cited by 28 publications

References 18 publications

Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

Numerical modeling of multiphase flows in microfluidics and micro process engineering: a review of methods and applications

Microfluidic analysis of CO2 bubble dynamics using thermal lattice-Boltzmann method

Contact Info

Product

Resources

About