Pore-scale lattice Boltzmann simulation of flow and mass transfer in bioreactor with an immobilized granule for biohydrogen production

2017 ◽  
Vol 62 (1) ◽  
pp. 22-30 ◽  
Author(s):  
Qiang Liao ◽  
Yan-Xia Yang ◽  
Xun Zhu ◽  
Rong Chen ◽  
Qian Fu
Keyword(s):  
Mass Transfer ◽  
Lattice Boltzmann ◽  
Biohydrogen Production ◽  
Pore Scale ◽  
Lattice Boltzmann Simulation

Lattice Boltzmann Simulation of Lithium Peroxide Formation in Lithium–Oxygen Battery

2016 ◽  
Vol 13 (3) ◽  
Author(s):  
M. Jithin ◽  
Malay K. Das ◽  
Ashoke De
Keyword(s):  
Porous Media ◽  
Lattice Boltzmann ◽  
Pore Scale ◽  
Peroxide Formation ◽  
Initial Current ◽  
Lattice Boltzmann Simulation ◽  
Lithium Peroxide ◽  
Lower Porosity ◽  
Lithium Oxygen Battery ◽  
Boltzmann Method

Present research deals with multiphysics, pore-scale simulation of Li–O2 battery using multirelaxation time lattice Boltzmann method. A novel technique is utilized to generate an idealized electrode–electrolyte porous media from the known macroscopic variables. Present investigation focuses on the performance degradation of Li–O2 cell due to the blockage of the reaction sites via Li2O2 formation. Present simulations indicate that Li–air and Li–O2 batteries primarily suffer from mass transfer limitations. The study also emphasizes the importance of pore-scale simulations and shows that the morphology of the porous media has a significant impact on the cell performance. While lower porosity provides higher initial current, higher porosity maintains sustainable output.

scholarly journals Lattice Boltzmann Simulation of Multicomponent Porous Media Flows With Chemical Reaction

2021 ◽  
Vol 9 ◽  
Author(s):  
Timan Lei ◽  
Kai H. Luo
Keyword(s):  
Mass Transfer ◽  
Porous Media ◽  
Heat And Mass Transfer ◽  
Lattice Boltzmann ◽  
Heterogeneous Reaction ◽  
Fluid Viscosity ◽  
Pore Scale ◽  
Homogeneous Reaction ◽  
Multicomponent Flows ◽  
Coke Combustion

Flows with chemical reactions in porous media are fundamental phenomena encountered in many natural, industrial, and scientific areas. For such flows, most existing studies use continuum assumptions and focus on volume-averaged properties on macroscopic scales. Considering the complex porous structures and fluid–solid interactions in realistic situations, this study develops a sophisticated lattice Boltzmann (LB) model for simulating reactive flows in porous media on the pore scale. In the present model, separate LB equations are built for multicomponent flows and chemical species evolutions, source terms are derived for heat and mass transfer, boundary schemes are formulated for surface reaction, and correction terms are introduced for temperature-dependent density. Thus, the present LB model offers a capability to capture pore-scale information of compressible/incompressible fluid motions, homogeneous reaction between miscible fluids, and heterogeneous reaction at the fluid–solid interface in porous media. Different scenarios of density fingering with homogeneous reaction are investigated, with effects of viscosity contrast being clarified. Furthermore, by introducing thermal flows, the solid coke combustion is modeled in porous media. During coke combustion, fluid viscosity is affected by heat and mass transfer, which results in unstable combustion fronts.

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