锌镍单液流电池正极内部流动与传质过程的格子Boltzmann方法数值模拟

Lattice Boltzmann Simulation of Internal Flow and Mass Transfer in the Cathode of Zinc-Nickel Single-Flow Battery

中文关键词: 格子玻尔兹曼方法、锌镍单液流电池、孔隙尺度、多孔电极

英文关键词: Lattice Boltzmann simulation of internal flow and mass transfer in the cathode of zinc-nickel single-flow battery

中文摘要:

      本文针对锌镍单液流电池多孔正极，基于格子玻尔兹曼方法从孔隙尺度对多孔正极内的流动传质及化学反应过程进行了模拟，获得了多孔电极孔隙内部电解液渗流速度场，浓度场和电流密度变化。从孔隙内渗流与传质的角度分析了不同充电电流、电解液流速和多孔电极孔隙率对电极电化学反应的影响。

英文摘要:

      In this study, the lattice Boltzmann method was used to simulate the flow mass transfer process in the porous medium of a zinc-nickel single-flow battery based on the pore size. The flow velocity field, concentration field, and current density change in the pore electrolyte of the porous electrode were obtained. The influence of the charge current, electrolyte flow velocity, and porous electrode porosity on the electrochemical reaction of electrode was analyzed from the perspective of seepage and mass transfer in pores. This paper draws the following conclusions: The electrolyte flow velocity has little effect on the electrochemical reaction process in the pore of the positive electrode. But the performance of the charge current density and the porosity is opposite to the electrolyte flow velocity. In the direction of the thickness of the electrode, the increase in the charge current density or in the porosity will increase the fluctuation of the chemical reaction velocity. Besides, with the increase of porosity, the increase of the average concentration in the pores has a tendency to decrease gradually.