A counter-flow heat exchanger comprising a heat exchanger core including an inner wall and an outer wall radially outward and spaced apart from the inner wall. A first flow path is defined within the inner wall and a second flow path is defined between the inner wall and the outer wall. The heat exchanger core includes a primary flow inlet, a primary flow outlet and a middle portion therebetween. The inner and outer walls are concentric at the primary flow inlet of the heat exchanger core. The inner wall defines a first set of channels extending axially from the primary flow inlet to the middle portion of the heat exchanger core diverging away from a radial center of the heat exchanger core. The inner wall and the outer wall define a second set of channels extending axially from the primary flow inlet to the middle portion of the heat exchanger core converging toward the radial center of the heat exchanger core.

A counter-flow heat exchanger comprising a heat exchanger core including an inner wall and an outer wall radially outward and spaced apart from the inner wall. A first flow path is defined within the inner wall and a second flow path is defined between the inner wall and the outer wall. The heat exchanger core includes a primary flow inlet, a primary flow outlet and a middle portion therebetween. The inner and outer walls are concentric at the primary flow inlet of the heat exchanger core. The inner wall defines a first set of channels extending axially from the primary flow inlet to the middle portion of the heat exchanger core diverging away from a radial center of the heat exchanger core. The inner wall and the outer wall define a second set of channels extending axially from the primary flow inlet to the middle portion of the heat exchanger core converging toward the radial center of the heat exchanger core.

An electroformed heat exchanger suitable for use between rotating blades and seals in a stationary casing of a turbine engine. The heat exchanger comprising a non-electroformed carrier plate having a radial outer surface and a radial outer surface, an electroformed duct provided along the radial outer surface, an electroformed rail provided on the radial inner surface, and an electroformed stiffener formed by a portion of the electroformed duct and the electroformed rail.

An electroformed heat exchanger suitable for use between rotating blades and seals in a stationary casing of a turbine engine. The heat exchanger comprising a non-electroformed carrier plate having a radial outer surface and a radial outer surface, an electroformed duct provided along the radial outer surface, an electroformed rail provided on the radial inner surface, and an electroformed stiffener formed by a portion of the electroformed duct and the electroformed rail.

A fin manufacturing method and apparatus includes: a first inter-row slit device that forms, by forming in a thin metal plate having a plurality of openings a plurality of slits extending in a longitudinal direction of the thin metal plate while leaving an uncut portion between the plurality of slits, metal strips partially coupled to each other in a transverse direction; a feed roller and a feeding device that convey, in the longitudinal direction, the metal strips in which the plurality of slits is formed by the first inter-row slit device; and a stacking device that (i) forms fins by cutting the uncut portion via which the metal strips are coupled to each other, to separate the metal strips and by cutting the metal strips at regular length intervals and (ii) stacks the formed fins.

A fin manufacturing method and apparatus includes: a first inter-row slit device that forms, by forming in a thin metal plate having a plurality of openings a plurality of slits extending in a longitudinal direction of the thin metal plate while leaving an uncut portion between the plurality of slits, metal strips partially coupled to each other in a transverse direction; a feed roller and a feeding device that convey, in the longitudinal direction, the metal strips in which the plurality of slits is formed by the first inter-row slit device; and a stacking device that (i) forms fins by cutting the uncut portion via which the metal strips are coupled to each other, to separate the metal strips and by cutting the metal strips at regular length intervals and (ii) stacks the formed fins.

Various embodiments of the teachings herein include a process for producing a cooling element. The method may include: providing a main element composed of a first material and having one or more cooling channels; applying a first layer of a second material to a surface of the one or more cooling channels; introducing a filler serving as support material for a second layer; applying the second layer of the second material, so that one or more closed channels made up of the first layer and the second layer are formed in the one or more cooling channels; and applying a covering layer to the one or more closed channels.

Various embodiments of the teachings herein include a process for producing a cooling element. The method may include: providing a main element composed of a first material and having one or more cooling channels; applying a first layer of a second material to a surface of the one or more cooling channels; introducing a filler serving as support material for a second layer; applying the second layer of the second material, so that one or more closed channels made up of the first layer and the second layer are formed in the one or more cooling channels; and applying a covering layer to the one or more closed channels.

A heat exchanger includes a first fluid inlet, a first fluid outlet, a second fluid inlet, a second fluid outlet, and a core section. The core section includes a plurality of first fluid passages through which a first fluid is flowed, and a plurality of second fluid passages through which a second fluid is flowed to exchange thermal energy with the first fluid. The first fluid passages and the second fluid passages extend non-linearly along a length of the first fluid passages and the second fluid passages between a first core end and a second core end opposite the first core end. A manifold is operably connected to the plurality of first fluid passages. The manifold includes a plurality of lateral passages intersecting the plurality of first fluid passages. The plurality of lateral passages vary in length depending on distance from a fluidly upstream end of the core section.

A heat exchanger includes a first fluid inlet, a first fluid outlet, a second fluid inlet, a second fluid outlet, and a core section. The core section includes a plurality of first fluid passages through which a first fluid is flowed, and a plurality of second fluid passages through which a second fluid is flowed to exchange thermal energy with the first fluid. The first fluid passages and the second fluid passages extend non-linearly along a length of the first fluid passages and the second fluid passages between a first core end and a second core end opposite the first core end. A manifold is operably connected to the plurality of first fluid passages. The manifold includes a plurality of lateral passages intersecting the plurality of first fluid passages. The plurality of lateral passages vary in length depending on distance from a fluidly upstream end of the core section.