CFD software turns to fuel-cell research

A CHAM product story
Edited by the Engineeringtalk editorial team Oct 19, 2005

Researchers at the National Research Council of Canada have been using Phoenics CFD software to model fuel cells since 1999.

Fuel cells have become the subject of much interest as a potential low-carbon-fuel substitute for conventional heat engines.

Canada is currently a world leader in the development of modern fuel cells.

Researchers at the National Research Council of Canada (NRC) have been using Phoenics CFD software from CHAM to model fuel cells since 1999.

As Dr Steven Beale of NRC explains, a fuel cell is an electrochemical device, which converts hydrogen-rich fuel and oxygen to electricity (and heat, unlike a battery, a fuel cell does not require recharging.

Fuel cells are typically operated in stacks in order to increase the operating voltage.

Says Beale: "We have studied both high-temperature solid oxide (SOFCs) and low temperature proton exchange membrane fuel cells (PEMFCs)".

"The temperature distribution is critical to the operation of both PEMFCs and SOFCs".

Several CFD code vendors are actively developing detailed fuel cell modules for performance calculations of the hydrodynamics and electrochemistry within the passages of fuel cells for applications in the automotive and stationary power industries.

The main problem with the conventional approach is that enormous meshes are required, to perform flow-field calculations within the numerous passages of the fuel cell.

Moreover these flow fields are for the most part quite uninteresting; simple internal flow in curved ducts, hardly worthy of the full solution of the pressure-corrected momentum equations.

"We have therefore taken a different approach", says Beale, "and used the unique features of Plant, and the multiply shared space (Muses) method originally developed to model heat exchangers, to perform calculations in planar SOFCs based on a 'distributed resistance analogy'".

Results based on the Muses method have been validated carefully against detailed simulations using fine meshes.

Agreement is excellent.

Says Beale: "We are also exploring the use of the Parsol cut-cell technique to perform detailed calculations in PEMFCs, for which we are simultaneously developing experimental and numerical results in order to create a high quality database for future basic research and code validation".

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