Foam metal heat exchanger system

1. An apparatus comprising:

a foam metal panel heat exchanger core positioned in a duct;

an inlet flow passage for directing a first fluid to the heat exchanger core; and

an exit flow passage for directing the first fluid from the heat exchanger core;

wherein the inlet flow passage is tapered relative to an inlet face of the heat exchanger core and the exit flow passage is tapered relative to an outlet face of the heat exchanger core, and wherein the heat exchanger core includes a first plurality of foam metal panels for passing the first fluid, and a second plurality of foam metal panels for passing a second fluid, with panels of the second plurality of foam metal panels being positioned between panels of the first plurality of foam metal panels.

2. The apparatus of claim 1 , wherein the foam metal has a higher flow resistance in the plane of the core than in a direction perpendicular to the first fluid flow direction.

3. The apparatus of claim 1 , further comprising:

a plurality of separators in the duct forming a plurality of passages, wherein the foam metal panels in the heat exchanger core are positioned in the plurality of passages.

4. The apparatus of claim 1 , wherein the foam metal panels in the heat exchanger core are arranged in a W configuration.

5. The apparatus of claim 1 wherein the first and second fluids flow in directions that are substantially anti-parallel to each other.

6. The apparatus of claim 1 , wherein the first and second fluids flow in directions that are substantially perpendicular to each other.

7. The apparatus of claim 1 , wherein the inlet flow passage is sized to mitigate the effects of ingested sand and dust.

8. The apparatus of claim 1 , wherein the first fluid has a substantially uniform flow distribution through the heat exchanger core.

9. The apparatus of claim 1 , wherein inlet and exit flow passages associated with adjacent panels are adjacent to each other.

10. The apparatus of claim 1 , wherein the panels in the heat exchanger core comprise a compressed foam.

11. An apparatus comprising:

a foam metal heat exchanger;

a duct structured and arranged to provide uniform flow through the heat exchanger; and

means for causing a fluid to flow through the foam metal heat exchanger, wherein the foam metal heat exchanger comprises foam metal on one side and an extended or non-extended surface on another side with either cross-flow or counter-flow arrangements.

12. The apparatus of claim 11 , wherein the means for causing a fluid to flow through the foam metal heat exchanger comprises a vehicle coupled to the duct such that movement of the vehicle provides ram flow pressure to force a fluid through the foam metal.

13. The apparatus of claim 11 , wherein the means for causing a fluid to flow through the foam metal heat exchanger comprises a fluid prime mover for providing flow and pressure to force a fluid through the foam metal.

14. The apparatus of claim 11 , wherein the foam metal heat exchanger further comprises:

foam metal on a second side of the extended or non-extended core with either cross-flow or counter-flow arrangements.

15. An apparatus comprising:

a plurality of foam metal cores positioned adjacent to each other and separated by plates, wherein the foam metal cores are structured and arranged such that a first fluid flows in a first direction through a first set of the cores and a second fluid flows in a second direction through a second set of the cores.

16. The apparatus of claim 15 , wherein the plates comprise fin stock.

17. The apparatus of claim 15 , further comprising headers for directing the second fluid into the second set of the cores.