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Study of novel flow channels influence on the performance of direct methanol fuel cell

journal contribution
posted on 08.11.2021, 14:22 by Jegathishkumar Ramasamy, Karthikeyan Palaniswamy, Thanarajan Kumaresan, Mathan Chandran, Rui ChenRui Chen
The existing flow channels like parallel and gird channels have been modified for better fuel distribution in order to boost the performance of direct methanol fuel cell. The main objective of the work is to achieve minimized pressure drop in the flow channel, uniform distribution of methanol, reduced water accumulation, and better oxygen supply. A 3D mathematical model with serpentine channel is simulated for the cell temperature of 80 °C, 0.5 M methanol concentration. The study resulted in 40 mW/cm2 of power density and 190 mA/cm2 of current density at the operating voltage of 0.25 V. Further, the numerical study is carried out for modified flow channels to discuss their merits and demerits on anode and cathode side. The anode serpentine channel is unmatched by the modified zigzag and pin channels by ensuring the better methanol distribution under the ribs and increased the fuel consumption. But the cathode serpentine channel is lacking in water management. The modified channels at anode offered reduced pressure drop, still uniform reactant distribution is found impossible. The modified channels at cathode outperform the serpentine channel by reducing the effect of water accumulation, and uniform oxygen supply. So the serpentine channel is retained for methanol supply, and modified channel is chosen for cathode reactant supply. In comparison to cell with only serpentine channel, the serpentine anode channel combined with cathode zigzag and pin channel enhanced power density by 17.8% and 10.2% respectively. The results revealed that the zigzag and pin channel are very effective in mitigating water accumulation and ensuring better oxygen supply at the cathode.

Funding

DST-UKIERI project (DST/INT/UK/P121/2016) partnership with Loughborough University, U.K and PSG College of Technology, India

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

International Journal of Hydrogen Energy

Volume

47

Issue

1

Pages

595-609

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Hydrogen Energy Publications LLC

Publisher statement

This paper was accepted for publication in the journal International Journal of Hydrogen Energy and the definitive published version is available at https://doi.org/10.1016/j.ijhydene.2021.10.033.

Acceptance date

05/10/2021

Publication date

2021-10-30

Copyright date

2022

ISSN

0360-3199

Language

en

Depositor

Prof Rui Chen. Deposit date: 7 November 2021