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what is the density of the packing? are the fins really close together - you can make a mock part that is slightly larger than the finned tube (either solid if lots of fins or rippled surface (like a gear) if few fins) - then define a local mesh inside that mock part so it refines the fins - then disable the solid part so it doesn't see it as a component, it simply uses it to refine the mesh and then ignores it - you can use the same mock part to refine the fluid cells also so that the contact between fin and external fluid is refined
I will give that a try & see what develops.
Thanks that should give me a new starting point anyways.