Hydrogen-Bromine Flow Battery Hydrodynamic Modeling, Simulation and Experimental Validation
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
This thesis investigated the hydrodynamics of the flow field design of a hydrogen-bromine flow battery developed by the company Elestor. The flow field of a flow battery is the part that brings the fresh electrolyte to the cell. This process has common problems like stagnation of the electrolyte and poor flow in some parts of the cell that leads to mass transport limitation. These works have been developed with two approaches to solve this problem, the first a CFD analysis using Autodesk CFD simulation® of the flow field of the battery to study the velocity profiles and pressure drops inside the cell. Second, an experimental validation using the flow flied developed by Elestor with two transparent plates to observe the behavior of the fluid inside the cell with a video processor program and a pressure gauge to study the pressure drops with several flow rates.
The outcome of this study was a successful validation of the numerical model with the experiment developed with the flow field, matching pressure drop and velocity profiles. After obtaining a numerical model that approaches the real model, a closer study of the velocity profiles was done inside the flow field which revealed a recirculation at the inlet and outlet of the fluid that could lead to problems of stagnation in this areas. Also, a comparison was made of the ideal velocity of the electrolyte should have inside the cell to the velocities found inside the cell. On average with a flow rate 27 ml/min the velocity exceeds the optimal velocity, but there are still some areas under this threshold that could lead to an incomplete reaction and loss in efficiency. The main conclusion of this research is that further designs of the inlet and outlet had to be developed and further numerical models have to be done to best reach the design for this hydrogen-bromine flow battery.
Place, publisher, year, edition, pages
2015. , 67 p.
EES Examensarbete / Master Thesis
Flow Field, Hydrogen-Bromine Flow Battery, CFD, Design, Fluid Flow, Experimental Validation
IdentifiersURN: urn:nbn:se:kth:diva-175756OAI: oai:DiVA.org:kth-175756DiVA: diva2:862198
Master of Science in Engineering - Energy and Environment
2015-09-11, Stockholm, 11:00 (English)
Saadatfar, BahramFakhrai, Reza