Abstract
The effect of surface roughness on heat transfer capacity is still an active research area in the sector of heat exchanger manufacturing. Management of roughness is important because on one hand it has been demonstrated that a rough surface can increase the heat exchange, when this value is comparable to the height of the laminar layer, and on the other hand increasing surface roughness increase pressure drop which can reduce the performance of the heat exchanger. AM allows for the production of components with complex geometry (e.g. heat exchangers with internal cooling channels) but also with high surface roughness; thus it is necessary to refine the final product in order to reduce and optimize this aspect. The possibility of applying surface treatment methods to internal cooling channels of different dimensions in AlSi7Mg components obtained through Selective Laser Melting (SLM) technology is studied. The application of tumbling and electropolishing (ECP) is evaluated through an experimental campaign. Different tumbling and ECP conditions are applied with the aim of evaluating the penetration effect of the treatment into the channels of the component.
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