Patent ID: 8511977

Claim:
A heat transfer passage within a component, said passage being arranged to receive a heat transfer fluid flow during use and comprising: opposing side walls, a base extending between said side walls and one or more upstanding formations extending from said base between said side walls, each of the one or more upstanding formations including a projection portion which is spaced from at least one of said opposing walls, wherein the one or more upstanding formations are arranged to induce separation of a boundary layer portion of said heat transfer fluid flow from the base in use, each of the one or more upstanding formations includes a first portion which contacts both the opposing side walls and the base, the projection portion, which is spaced from at least one of said opposing walls, extends from each of the one or more upstanding formations and is spaced from the base by the first portion, and the projection portion spans at least 60% of a width of the passage.