Patent ID: 7980818

Claim:
A member comprising a parent material configured to have an internal cooling passage formed between opposed wall surfaces thereof, the member being arranged such that a medium flows through the internal cooling passage along a flow axis of the internal cooling passage to cool the parent material, the member further comprising: a first rib which extends to one wall surface from almost the center of the internal cooling passage between the opposed wall surfaces, and slants in a downstream direction of the medium, thereby providing resistance to the flow of the medium along the flow axis, and a second rib which extends to the other wall surface from almost the center of the internal cooling passage between the opposed wall surfaces, and slants in the downstream direction of the medium, thereby providing resistance to the flow of the medium along the flow axis, wherein the first rib or the second rib is configured to have an opening therethrough from an upstream side of the opened rib to a downstream side of the opened rib, the opened rib thereby reducing the resistance to the flow of the medium along the flow axis, allowing the medium to flow through the opening and then to be directed to the rear side of the opened rib thereby to reduce a recirculation zone at the rear side of the opened rib, and wherein the opening deflects the flow of the medium to the wall surfaces.