Two and three dimensional modeling of a single cell of vanadium redox flow battery has been done thoroughly according to electrochemical and fluid mechanic equations in this study. The modeling has been done in stationary state and its results have been presented in three chemical, electrical and mechanical sub models. The parametric analysis on some of important factors in cell operation demonstrated that increase in electrode and membrane conductivity and electrode porosity contributes to electric potential increase in cells. Also operational temperature increase leads to decrease in cells' voltage. Better fluid distribution on the electrode surface area results in better cell operation, therefore the electrolyte flow distribution form in cell has been studied by designing different flow frames. Modified Navier-Stokes equations have been used in these calculations for porous media. The most coverage on electrode surface and low pressure loss had been the best case criteria.
It has been attempted to gain a new viewpoint in transient cell modeling of vanadium redox flow battery. This has been achieved by considering electrochemical relations along with conceptual electrical circuit of this kind of battery. The redox flow battery is one of the best rechargeable batteries because of its capability to average loads and output power sources. A model of transient behavior is presented in this paper. The transient features are considered as the most remarkable characteristics of the battery. The chemical reactions, fluid flow, and electrical circuit of the structure govern the dynamics. The transient behavior of the redox flow battery based on chemical reactions is discussed in this paper. According to the model responses, the relation between electrolyte concentration changes and the battery cell with current density has been studied in transient state and the rate of state of charge changes has been achieved. Sensitivity analysis based on the presented model indicated that the battery voltage highly depends on the concentration amount of reactants. In addition the negative effect of the operation temperature increases on one hand and the effect of electrolyte fluid flow rate on the other hand have been noticed on output voltage of the cell.
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