Cannot View Heat Flux on plane Surface

Hello, I am investigating the effect of forced air fan configurations for heat sink. I have attached pictures as shown below. My problem is that when I go to contours and try to select wall heat transfer coefficient

Also, what does it mean to have negative heat flux values?

I am also not sure why there isn't a large temperature gradient in the second picture? Shouldn't the edges closer to the inlet be cooler? There is a very small gradient as you can see in the picture. This is a steady state configuration using K-epsilon. My mesh is also decently refined.



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