A heat sink with a base defining a first side having a base planar surface, and a plurality of planar fins extending from the base planar surface in parallel disposition relative to each other. Each planar fin has a bottom fin edge, a top fin edge, and a leading fin edge. Each planar fin has a fin planar surface and one or more control surfaces. Each of the one or more control surfaces extends from the fin planar surface and is disposed relative to the fin planar surface, the bottom fin edge, and the top fin edge such that a fluid flowing from the leading fin edge is conducted toward the base planar surface.