A fully coupled model is proposed to investigate the influence of flow on electrochemical mass transfer at the interface between the electrolyte and an electrically conductive droplet. The electric current flows through the droplet, and consequently the droplet acts as both anode and cathode. Computations of flow, concentration of reactant, and electric current density fields were carried out. Various droplet sizes (0.5, 2, 4 mm) under different flow regimes considering Reynolds number (Re = 0.2, 2, 20, 40 and 80) were investigated. An iterative numerical method is proposed to determine the concentration of reactant and electric current density at droplet-electrolyte interface considering the reaction kinetics (Butler-Volmer) formula and the diffusion-advection of the reactant through the hydrodynamic boundary layer around the droplet. With the increase of Reynolds number, the amount of electric current density which flows through the droplet increases. It is found that the mass transfer at droplet-electrolyte interface is controlled by reaction kinetics for the small droplet (0.5 mm). However, the diffusion of the reactant governs the efficiency of mass transfer with the increase of the droplet size (2 and 4 mm). With the increase of Reynolds number, the anodic area on the surface of droplet is enlarged.

提出了一个完全耦合的模型来研究流动对电解质和导电液滴之间界面处的电化学传质的影响。电流流过小滴，因此小滴既充当阳极又充当阴极。进行流量，反应物浓度和电流密度场的计算。考虑雷诺数（Re = 0.2、2、20、40和80）。提出了一种迭代数值方法，根据反应动力学公式（Butler-Volmer）和反应物通过液滴周围水力边界层的扩散对流，确定了液滴与电解质界面的反应物浓度和电流密度。随着雷诺数的增加，流过液滴的电流密度的量增加。发现小液滴（0.5 mm）的反应动力学控制了液滴与电解质界面的传质。但是，随着液滴尺寸（2和4 mm）的增加，反应物的扩散决定了传质效率。随着雷诺数的增加，液滴表面的阳极面积增大。