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Effect of suface finish on heating solids and pastes?

Effect of suface finish on heating solids and pastes?

Effect of suface finish on heating solids and pastes?

(OP)
I am debottlenecking a continuous dryer which fouls at high production rates.  What impact would adding a diamond like coating or nitriding or polishing the 316 stainless steel have on the heat and hydrodynamic transport?

Adhesion (cohesion) of the sodium organic salt to a mill finished stainless steel is very high at the operating temperature 300 F.  It is highly agglomerating and forms crust if not mechanically disturbed.  

The dryer is built as a heated horizontal cylinder, containing a center shaft with a spiral of short blades that intermesh with stationary hooks, to clean the heated blades (~ 3 mm clearence).  

If I only modify the cylinder interior, I imagine sliding but the hooks would result in surface renewal.  Is there a negative to not coating the hooks, shaft and blade?  Lack of convective turnover? increased stress on the hooks?

If I modify all surfaces, can I be too slick?

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