I am working on a problem in which a material sample is shredded to a fine particle size, and i am working on heat transfer equations for this bulk material. I was thinking that once the material is shredded, it will be able to conduct heat more easily, and thus the shredded material would have a higher thermal conductivity than the unshredded material. I think this because in my experience with starting camp fires, you have to use small tinder and kindling in order to start the fire, rather than starting with a large log. It also may be possible the thermal conductivity stays constant, however the smaller particle size allows for higher rates of convective heat transfer. Any info on this topic or relevant studies would be much appreciated!
In your case, the new bulk material will have different conductivity from the original because there will be air and contact resistance between the shredded pieces. However, more details about your cases are needed to better assess the heat conduction.
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