catalytic combustion in channel
 

Trying to replicate results in "Transient simulation of the combustion of fuel lean
hydrogen/air mixtures in platinum-coated
channels" by Nicola Michelon, John Mantzaras & Paolo Canu for equivalence ratio of .28 and inlet velocity of 50 m/s to compare with the results in Fig. 7 of the paper. I'm using Deutschmann's surface chemistry model, modified for hydrogen on platinum and a basic radiation model for the front and back of the plate, though have not written a UDF using the specific radiation model in the paper.

Problem is, temperature is exceeding 5000K. Reducing energy UDF to .9 seems to alleviate this but "steady state" wall temperature then becomes dependent on the initial wall temperature used to ignite the mixture. Is this physically sound?