Lattice Boltzmann simulations of liquid droplets development and interaction in a gas channel of a proton exchange membrane fuel cell

Han, Bo; Yu, Ji Young; Meng, Hua

doi:10.1016/j.jpowsour.2011.11.071

Cited by 49 publications

(18 citation statements)

References 44 publications

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“…Therefore, the two-phase flows solved in the above tested cases and following numerical simulations concern the liquid water transport in a dense gaseous phase. However, the previous studies [23,25,27,[31][32][33][34] and the present test results have clearly shown that the LBM simulations are capable of capturing the fundamental physics in two-phase flows. …”

Section: Model Validationmentioning

confidence: 45%

“…More details concerning the two-phase lattice Boltzmann model can be found in the previous publications [22,23,32].…”

Section: Lattice Boltzmann Modelmentioning

confidence: 99%

“…Mukherjee et al [31] conducted LBM simulation to examine the two-phase transport process and liquid water flooding phenomena in the porous media of a PEMFC. Han et al [32][33][34] conducted two-dimensional two-phase LBM simulations to analyze the formation, growth, and interaction of liquid droplets inside the GDL and gas channel. Effects of several important parameters, including the gas flow velocity, surface contact angle, and gas channel shape, on the liquid water transport characteristics were investigated.…”

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional Lattice Boltzmann Simulation of Liquid Water Transport in Porous Layer of PEMFC

Han

Meng

2015

Entropy

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A three-dimensional two-phase lattice Boltzmann model (LBM) is implemented and validated for qualitative study of the fundamental phenomena of liquid water transport in the porous layer of a proton exchange membrane fuel cell (PEMFC). In the present study, the three-dimensional microstructures of a porous layer are numerically reconstructed by a random generation method. The LBM simulations focus on the effects of the porous layer porosity and boundary liquid saturation on liquid water transport in porous materials. Numerical results confirm that liquid water transport is strongly affected by the microstructures in a porous layer, and the transport process prefers the large pores as its main pathway. The preferential transport phenomenon is more profound with a decreased porous layer porosity and/or boundary liquid saturation. In the transport process, the breakup of a liquid water stream can occur under certain conditions, leading to the formation of liquid droplets inside the porous layer. This phenomenon is related to the connecting bridge or neck resistance dictated by the surface tension, and happens more frequently with a smaller porous layer porosity. Results indicate that an optimized design of porous layer porosity and the combination of various pore sizes may improve both the liquid water removal and gaseous reactant transport in the porous layer of a PEMFC.

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Section: Model Validationmentioning

confidence: 45%

“…More details concerning the two-phase lattice Boltzmann model can be found in the previous publications [22,23,32].…”

Section: Lattice Boltzmann Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional Lattice Boltzmann Simulation of Liquid Water Transport in Porous Layer of PEMFC

Han

Meng

2015

Entropy

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“…The collision procedure relaxes the density distribution functions on a lattice toward the equilibrium states, while the streaming step moves the particle distributions to the immediate neighboring lattices with specified velocity magnitudes and directions. More details concerning this LBGK model, along with the ShaneChen two-phase treatment, can be found in our prior publication [44] and the related references cited there.…”

Section: Model Description and Validationmentioning

confidence: 99%

“…The formation of a liquid water droplet through a micropore, its subsequent growth and detachment on the channel surface under the air shear force were clearly illustrated. Han et al further employed the ShaneChen two-phase lattice Boltzmann model to simulate two liquid droplets development and interaction in the gas channel of a PEM fuel cell [44]. The effects of a number of key influential parameters, including the gas flow velocity, initial droplet distance, different micropore combinations, and the gas diffusion layer (GDL) surface wetting properties on liquid droplets interaction and transport were analyzed.…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann simulation of liquid water transport in turning regions of serpentine gas channels in proton exchange membrane fuel cells

Han

Meng

2012

Journal of Power Sources

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Three‐dimensional Lattice Boltzmann simulation of gas‐water transport in tight sandstone porous media: Influence of microscopic surface forces

Wang

Liu

et al. 2020

Energy Science & Engineering

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A three-dimensional two-phase Lattice Boltzmann model was developed and validated for the fundamental phenomena of gas-water transport in tight porous media considering microscopic forces, namely, the electrostatic and solid-liquid intermolecular forces. The thickness of the water film adhering to the porous media surface was calculated based on the principle of thermodynamic equilibrium and the gas-water electrostatic potential energy. The Lattice Boltzmann model simulations focused on the effects of the microscopic forces and water film thickness on the gas-water transport in tight porous media. The fluid flow in the porous media was simulated under different conditions for the characteristic length, interfacial tension, and displacement pressure gradient. The results confirmed that the gas-water transport is strongly affected by the microscopic forces in tight porous media and that the transport process is accompanied by a high seepage resistance. The seepage resistance is more pronounced in the case of smaller pores because the adhering water film is thicker and more stable. During the transport process, the water film may disintegrate under certain conditions, which would enhance the gas flow in the porous media. However, it is difficult to effectively improve the gas flow by increasing the displacement pressure gradient under microscopic forces; this can be attributed to the accumulation of water or increased seepage resistance dictated by the interfacial tension, which occurs more frequently with smaller pores. This paper provides a promising new perspective for efficiently improving the Lattice Boltzmann model for transport trends considering microscopic forces. K E Y W O R D S bounded water film, gas-water two-phase transport, Lattice Boltzmann model, microscopic surface force, tight sandstone gas reservoir | 1925 HU et al. egge (s) The position of the gas leading edge (x/L) The interfacial tension: 0.020 N/m The interfacial tension: 0.025 N/m The interfacial tension: 0.030 N/m The interfacial tension: 0.035 N/m The interfacial tension: 0.040 N/m 0 5 10 15 20 0 0 .2 0.4 0 .6 0.8 1 The breakthrough time of the leading edge (s) The position of the gas leading edge (x/L) The interfacial tension: 0.020 N/m The interfacial tension: 0.025 N/m The interfacial tension: 0.030 N/m The interfacail tension: 0.035 N/m The interfacial tension: 0.040 N/m

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Lattice Boltzmann simulations of liquid droplets development and interaction in a gas channel of a proton exchange membrane fuel cell

Cited by 49 publications

References 44 publications

Three-Dimensional Lattice Boltzmann Simulation of Liquid Water Transport in Porous Layer of PEMFC

Three-Dimensional Lattice Boltzmann Simulation of Liquid Water Transport in Porous Layer of PEMFC

Lattice Boltzmann simulation of liquid water transport in turning regions of serpentine gas channels in proton exchange membrane fuel cells

Three‐dimensional Lattice Boltzmann simulation of gas‐water transport in tight sandstone porous media: Influence of microscopic surface forces

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