Monolithic bicontinuous labyrinth structures and methods for their manufacture

1. A heat exchanger, comprising:

a core comprising a single piece continuous boundary having a first surface defining a first labyrinth, and an opposing second surface defining a second labyrinth;

a first inlet manifold connected to the first labyrinth and configured to supply a first fluid to the first labyrinth; and

a second inlet manifold connected to the second labyrinth and configured to supply a second fluid to the second labyrinth;

wherein:

the core comprises a plurality of three dimensional unit cell structures replicated in three orthogonal spatial dimensions;

the first inlet manifold defines a first inlet interface with the first labyrinth, and the second inlet manifold defines a second inlet interface with the second labyrinth;

the first inlet interface comprises a first inlet finning structure configured to selectively shunt the first fluid from the second labyrinth and selectively direct the first fluid into the first labyrinth; and

the second inlet interface comprises a second inlet finning structure configured to selectively shunt the second fluid from the first labyrinth and selectively direct the second fluid into the second labyrinth.

2. The heat exchanger of claim 1 , wherein:

the first discharge manifold defines a first discharge interface with the first labyrinth, and the second discharge manifold defines a second discharge interface with the second labyrinth;

the first discharge interface comprises a first discharge finning structure configured to close off the second labyrinth and selectively receive the first fluid from the first labyrinth; and

the second discharge interface comprises a second discharge finning structure configured to close off the first labyrinth and selectively receive the second fluid from the second labyrinth.

3. The heat exchanger of claim 1 , wherein the core, the first inlet finning structure, and the second inlet finning structure together comprise an integral monolithic structure configured to be fabricated using additive manufacturing techniques.

4. The heat exchanger of claim 2 , wherein the core, the first discharge finning structure, and the second discharge finning structure together comprise an integral monolithic structure configured to be fabricated using additive manufacturing techniques.

5. The heat exchanger of claim 1 , further comprising a support frame enclosing the core, wherein the frame and the core together comprise an integral monolithic structure configured to be fabricated using additive manufacturing techniques.

6. The heat exchanger of claim 1 , wherein the first labyrinth comprises a first continuous flow channel, and the second labyrinth comprises a second continuous flow channel, the heat exchanger further comprising a plurality of secondary surfaces extending inwardly from at least one of the first and second channel walls and configured to increase the heat exchange surface area and to promote turbulent flow.

7. The heat exchanger of claim 6 , wherein the secondary surfaces and the core together comprise an integral monolithic structure configured to be fabricated using additive manufacturing techniques.

8. A heat exchanger, comprising:

a core comprising a single piece continuous boundary having a first surface defining a first labyrinth, and an opposing second surface defining a second labyrinth;

a first inlet manifold connected to the first labyrinth and configured to supply a first fluid to the first labyrinth; and

a second inlet manifold connected to the second labyrinth and configured to supply a second fluid to the second labyrinth;

wherein:

the core comprises a plurality of three dimensional unit cell structures replicated in three orthogonal spatial dimensions

the first labyrinth comprises a first group of cells having a first cross-sectional area, and a second group of cells having a second cross-sectional area greater than the first cross-sectional area; and

the first group of cells are disposed proximate to the flow axis, and the second group of cells are disposed remote from the flow axis proximate to an external wall of the first labyrinth.