Redox Flow batteries (RFBs) stand out among other energy storage technologies due to their modular design and long cycle life . Vanadium Redox Flow Batteries (VRFBs) are currently the market leaders, owing to the possible re-utilization and rebalancing of their electrolytes . However, they still need to boost their competitiveness, given their higher costs and lower overall performance compared to other energy storage technologies, such as lithium-ion batteries . To improve the performance and operational flexibility of VRFBs, a comprehensive understanding of the electrolyte flow within the electrochemical conversion cell and the storage tanks is imperative. In particular, operational variations of electrolyte density and viscosity are known to affect VRFB operation.