I am doing a diesel catalytic combustion in micro-channel simulation with fluent. when I post-processed the result of heat of reaction on surface, I found that the unit of reaction heat fluent gave is W. I wonder the unit should be W per area, right? However I don't know what's the exact area unit, is it square meter or square millimeter? If It's millimeter, then the results are consistent with literature. If it's square meter, then my simulation results are much smaller than literature.