Friction stir channeling (FSC) is a new concept to produce integral channels in metallic materials. There are many applications where heat exchange is needed or desirable. The conventional approaches of building heat exchangers or incorporating fluid channels can be broadly divided in two groups. The first group would consist of use of tubes and joining processes, whereas the second group would involve machining of channels and joining of several pieces. FSC concept on the other hand can be used to create integral channels in a solid plate in one step. The shape and size of the channel can be controlled by the tool design as well as process parameters.