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Scaling Analysis of Thermal Behavior of Electrical Double Layers

[+] Author Affiliations
Anna d’Entremont, Hainan Wang, Laurent Pilon

University of California, Los Angeles, Los Angeles, CA

Paper No. HT2012-58487, pp. 395-403; 9 pages
doi:10.1115/HT2012-58487
From:
  • ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels
  • Volume 1: Heat Transfer in Energy Systems; Theory and Fundamental Research; Aerospace Heat Transfer; Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat and Mass Transfer in Biotechnology; Environmental Heat Transfer; Visualization of Heat Transfer; Education and Future Directions in Heat Transfer
  • Rio Grande, Puerto Rico, USA, July 8–12, 2012
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4477-9
  • Copyright © 2012 by ASME

abstract

Charging of electric double layer capacitors (EDLCs) may cause significant heat generation. The resulting elevated temperatures lead to shortened cell life and increased self-discharge rates and cell pressure. Better understanding and accurate modeling of the fundamental physical phenomena involved are needed for developing thermal management strategies and for designing and optimizing the next generation of EDLCs. Existing thermal models of EDLCs rely on experimentally measured heat generation rates or cell electrical resistances. This makes them unsuitable for assessing new and untested designs. The present study aims to develop a physical model accounting for the dominant transport phenomena taking place in EDLCs. It accounts for the presence of the Stern layer, finite ion size, ion diffusion, and Joule heating. It solves the modified Poisson-Nernst-Planck model with a Stern layer and the heat diffusion equation. A dimensional analysis was performed and six dimensionless parameters governing electrodiffusion coupled with heat transfer were identified and physically interpreted. The scaling analysis was successfully validated numerically.

Copyright © 2012 by ASME

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