scholarly journals Modeling flow distribution and pressure drop in redox flow batteries

AIChE Journal ◽  
2018 ◽  
Vol 64 (10) ◽  
pp. 3746-3755 ◽  
Author(s):  
Malcolm MacDonald ◽  
Robert M. Darling
Keyword(s):  
Pressure Drop ◽  
Flow Distribution ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Modeling Flow

scholarly journals Modeling the Effect of Channel Tapering on the Pressure Drop and Flow Distribution Characteristics of Interdigitated Flow Fields in Redox Flow Batteries

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 775
Author(s):  
Pablo A. García-Salaberri ◽  
Tugba Ceren Gokoglan ◽  
Santiago E. Ibáñez ◽  
Ertan Agar ◽  
Marcos Vera
Keyword(s):  
Experimental Data ◽  
Pressure Drop ◽  
Cross Sections ◽  
Porous Electrode ◽  
Flow Distribution ◽  
Flow Fields ◽  
Viscous Resistance ◽  
Redox Flow Batteries ◽  
Sink Term ◽  
Flow Batteries

Optimization of flow fields in redox flow batteries can increase performance and efficiency, while reducing cost. Therefore, there is a need to establish a fundamental understanding on the connection between flow fields, electrolyte flow management and electrode properties. In this work, the flow distribution and pressure drop characteristics of interdigitated flow fields with constant and tapered cross-sections are examined numerically and experimentally. Two simplified 2D along-the-channel models are used: (1) a CFD model, which includes the channels and the porous electrode, with Darcy’s viscous resistance as a momentum sink term in the latter; and (2) a semi-analytical model, which uses Darcy’s law to describe the 2D flow in the electrode and lubrication theory to describe the 1D Poiseuille flow in the channels, with the 2D and 1D sub-models coupled at the channel/electrode interfaces. The predictions of the models are compared between them and with experimental data. The results show that the most influential parameter is γ , defined as the ratio between the pressure drop along the channel due to viscous stresses and the pressure drop across the electrode due to Darcy’s viscous resistance. The effect of R e in the channel depends on the order of magnitude of γ , being negligible in conventional cells with slender channels that use electrodes with permeabilities in the order of 10 − 12 m 2 and that are operated with moderate flow rates. Under these conditions, tapered channels can enhance mass transport and facilitate the removal of bubbles (from secondary reactions) because of the higher velocities achieved in the channel, while being pumping losses similar to those of constant cross-section flow fields. This agrees with experimental data measured in a single cell operated with aqueous vanadium-based electrolytes.

scholarly journals The effect of felt compression on the performance and pressure drop of all-vanadium redox flow batteries

2016 ◽  
Vol 8 ◽  
pp. 91-98 ◽  
Author(s):  
Leon D. Brown ◽  
Tobias P. Neville ◽  
Rhodri Jervis ◽  
Thomas J. Mason ◽  
Paul R. Shearing ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

scholarly journals Pressure drop through platinized titanium porous electrodes for cerium-based redox flow batteries

AIChE Journal ◽  
2017 ◽  
Vol 64 (3) ◽  
pp. 1135-1146 ◽  
Author(s):  
Luis F. Arenas ◽  
Carlos Ponce de León ◽  
Frank C. Walsh
Keyword(s):  
Pressure Drop ◽  
Porous Electrodes ◽  
Redox Flow Batteries ◽  
Flow Batteries

A Self-Trapping, Bipolar Viologen Bromide Electrolyte for Aqueous Redox Flow Batteries

2020 ◽  
Author(s):  
wenda wu ◽  
Jian Luo ◽  
Fang Wang ◽  
Bing Yuan ◽  
Tianbiao Liu
Keyword(s):  
Redox Flow Battery ◽  
Capacity Retention ◽  
Redox Flow Batteries ◽  
Redox Electrolyte ◽  
Charge Process ◽  
Self Trapping ◽  
Flow Batteries ◽  
Total Capacity ◽  
Neutral Conditions ◽  
Low Solubility

Aqueous organic redox flow batteries (AORFBs) have become increasing attractive for scalable energy storage. However, it remains challenging to develop high voltage, powerful AORFBs because of the lack of catholytes with high redox potential. Herein, we report methyl viologen dibromide (<b>[MV]Br<sub>2</sub></b>) as a facile self-trapping, bipolar redox electrolyte material for pH neutral redox flow battery applications. The formation of the <b>[MV](Br<sub>3</sub>)<sub>2</sub></b> complex was computationally predicted and experimentally confirmed. The low solubility <b>[MV](Br<sub>3</sub>)<sub>2</sub></b> complex in the catholyte during the battery charge process not only mitigates the crossover of charged tribromide species (Br<sub>3</sub><sup>-</sup>) and addresses the toxicity concern of volatile bromine simultaneously. A 1.53 V bipolar MV/Br AORFB delivered outstanding battery performance at pH neutral conditions, specifically, 100% total capacity retention, 133 mW/cm<sup>2</sup> power density, and 60% energy efficiency at 40 mA/cm<sup>2</sup>.

Thermo–chemical treatments based on NH3/O2 for improved graphite-based fiber electrodes in vanadium redox flow batteries

Carbon ◽  
2013 ◽  
Vol 60 ◽  
pp. 280-288 ◽  
Author(s):  
Cristina Flox ◽  
Javier Rubio-García ◽  
Marcel Skoumal ◽  
Teresa Andreu ◽  
Juan Ramón Morante
Keyword(s):  
Chemical Treatments ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox
Sign in / Sign up

Export Citation Format

Share Document