Error of Darcy's law for serpentine flow fields

Dimensional analysis

Xuyang Zhang, Xu Zhang, Hidetaka Taira, Hongtan Liu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A serpentine flow field is commonly used in both fuel cells and redox flow batteries. Accurate prediction of mass transfer in the porous gas/liquid diffusion layer (GDL/LDL) is essential for both flow field design optimization and pressure drop predictions. Darcy's law has been widely used to predict fluid flow through GDL/LDL in fuel cells and flow batteries. However, since the inertial effect is neglected in the Darcy's law, significant errors can arise when it is applied to serpentine flow fields. In this work, dimensional analyses are performed using both the Buckingham Pi-theorem and the analytical models developed earlier based on Darcy's law and modified Darcy's law. From the Pi-theorem, four and five non-dimensional parameters are obtained from the Darcy's law and the modified Darcy's law, respectively. The variations of Darcy's law errors in predicting under-land cross-flow rate with each of the non-dimensional parameters are studied. By comparing the coefficient of each term of the two models, two independent Pi-terms for under-land cross-flow rate are obtained. The criterion for applicability of Darcy's law is developed based on the two Pi-terms. The model predicted errors of Darcy's law compared very well with experimental data, thus further confirms the applicability of developed criterion.

Original languageEnglish (US)
Pages (from-to)391-397
Number of pages7
JournalJournal of Power Sources
Volume412
DOIs
StatePublished - Feb 1 2019

Fingerprint

dimensional analysis
Flow fields
flow distribution
Fuel cells
Flow rate
Diffusion in liquids
Pressure drop
Flow of fluids
Analytical models
cross flow
Mass transfer
Gases
fuel cells
electric batteries
flow velocity
theorems
fuel flow
design optimization
predictions
pressure drop

Keywords

  • Darcy's law
  • Dimensional analysis
  • Modified Darcy's law
  • PEM fuel cell
  • Porous medium
  • Under-land cross-flow

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Error of Darcy's law for serpentine flow fields : Dimensional analysis. / Zhang, Xuyang; Zhang, Xu; Taira, Hidetaka; Liu, Hongtan.

In: Journal of Power Sources, Vol. 412, 01.02.2019, p. 391-397.

Research output: Contribution to journalArticle

Zhang, Xuyang ; Zhang, Xu ; Taira, Hidetaka ; Liu, Hongtan. / Error of Darcy's law for serpentine flow fields : Dimensional analysis. In: Journal of Power Sources. 2019 ; Vol. 412. pp. 391-397.
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