A heat transfer apparatus is described having a manifold. The manifold has a surface having a fluidic exit opening and a fluidic entrance opening. A fluid is to flow from the fluidic exit opening and into the fluidic entrance opening. The manifold has a protrusion emanating from the surface between the fluidic exit opening and the fluidic entrance opening. An apparatus is described having a thermally conductive grooved structure. The thermally conductive grooved structure has a surface having first and second cavities to form first and second fluidic channels. The thermally conductive grooved structure has a protrusion emanating from between the cavities. The protrusion has side surfaces to form parts of the first and second fluidic channels.