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A heat exchanger that includes an input cavity defined by inlet cavity walls; a heat exchanger portion in fluid communication with the input cavity and defined between a first side and a second side, and wherein a plurality of baffles are positioned within the heat exchanger portion; and an outlet c

A heat exchanger that includes an input cavity defined by inlet cavity walls; a heat exchanger portion in fluid communication with the input cavity and defined between a first side and a second side, and wherein a plurality of baffles are positioned within the heat exchanger portion; and an outlet cavity in fluid communication with the heat exchanger portion and defined by outlet cavity walls. The heat exchanger portion comprises: a plurality of first fluid paths defined between the baffles and extending from the input cavity to the outlet cavity, and a plurality of tubes extending through the heat exchanger portion from the first side to the second side. Each tube extends through the baffles so as to define a second fluid path through the heat exchanger portion. Heat exchanger systems are also generally provided, along with methods for cooling a hot fluid input with a heat exchanger.

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1. A heat exchanger comprising: an input cavity defined by inlet cavity walls;a heat exchanger portion in fluid communication with the input cavity and defined between a first side and a second side, wherein a plurality of baffles are positioned within the heat exchanger portion; andan outlet cavity

1. A heat exchanger comprising: an input cavity defined by inlet cavity walls;a heat exchanger portion in fluid communication with the input cavity and defined between a first side and a second side, wherein a plurality of baffles are positioned within the heat exchanger portion; andan outlet cavity in fluid communication with the heat exchanger portion and defined by outlet cavity walls,wherein the heat exchanger portion comprises: a plurality of first fluid paths defined between the baffles and extending from the input cavity to the outlet cavity, anda plurality of tubes extending through the heat exchanger portion from the first side to the second side, wherein each tube extends through the baffles so as to define a second fluid path through the heat exchanger portion,wherein each tube defines an inlet flow cross-section area at the first side and an outlet flow cross-section area at the second side, wherein at least one tube varies in its cross-section areas continuously from the first side to the second side of the heat exchanger portion. 2. The heat exchanger as in claim 1, wherein the first fluid paths are oriented in a cross-flow arrangement with respect to the second flow paths. 3. The heat exchanger as in claim 1, wherein at least one flow turbulating element is positioned on an external surface of a tube. 4. The heat exchanger as in claim 1, wherein at least one flow turbulating element is positioned on an internal surface of a tube. 5. The heat exchanger as in claim 1, wherein the tubes have a substantially oval shape through their length from the first side to the second side of the heat exchanger portion. 6. The heat exchanger as in claim 1, wherein each tube defines an inlet flow cross-section area at the first side and an outlet flow cross-section area at the second side, wherein the inlet flow cross-section area is larger than the outlet flow cross-section area. 7. The heat exchanger as in claim 1, wherein the heat exchanger portion comprises at least one side wall including a plurality of structural elements. 8. The heat exchanger as in claim 1, comprising a plurality of heat exchanger portions between the input cavity and the output cavity, wherein the plurality of heat exchanger portions are serially connected to each other with respect to the first flow path. 9. The heat exchanger as in claim 8, wherein a mixing cavity is positioned between each heat exchanger portion. 10. The heat exchanger as in claim 1, wherein the input cavity, the heat exchanger portion, and the outlet cavity define an integrated component formed via additive manufacturing. 11. The heat exchanger as in claim 1, wherein the baffles define the flow cross-section areas of the first fluid paths within the heat exchanger portion, wherein the flow cross-section areas vary in the first fluid paths from the inlet cavity to the outlet cavity. 12. The heat exchanger as in claim 11, wherein the flow cross-section areas of the first fluid paths vary between the first and second sides of the heat exchanger portion by changing baffle thickness, baffle spacing, tube spacing, or combinations thereof. 13. A heat exchanger comprising: an input cavity defined by inlet cavity walls;a heat exchanger portion in fluid communication with the input cavity and defined between a first side and a second side, wherein a plurality of baffles are positioned within the heat exchanger portion; andan outlet cavity in fluid communication with the heat exchanger portion and defined by outlet cavity walls;wherein the heat exchanger portion comprises: a plurality of first fluid paths defined between the baffles and extending from the input cavity to the outlet cavity; anda plurality of tubes extending through the heat exchanger portion from the first side to the second side, wherein each tube extends through the baffles so as to define a second fluid path through the heat exchanger portion;wherein at least one baffle is defined by a laminate wall comprising a layered, composite material. 14. A heat exchanger comprising: an input cavity defined by inlet cavity walls;a heat exchanger portion in fluid communication with the input cavity and defined between a first side and a second side, wherein a plurality of baffles are positioned within the heat exchanger portion; andan outlet cavity in fluid communication with the heat exchanger portion and defined by outlet cavity walls,wherein the heat exchanger portion comprises: a plurality of first fluid paths defined between the baffles and extending from the input cavity to the outlet cavity, anda plurality of tubes extending through the heat exchanger portion from the first side to the second side, wherein each tube extends through the baffles so as to define a second fluid path through the heat exchanger portion,wherein each tube defines an inlet flow cross-section area at the first side and an outlet flow cross-section area at the second side, wherein the inlet flow cross-section area is smaller than the outlet flow cross-section area. 15. A heat exchanger comprising: an input cavity defined by inlet cavity walls;a heat exchanger portion in fluid communication with the input cavity and defined between a first side and a second side, wherein a plurality of baffles are positioned within the heat exchanger portion; andan outlet cavity in fluid communication with the heat exchanger portion and defined by outlet cavity walls,wherein the heat exchanger portion comprises: a plurality of first fluid paths defined between the baffles and extending from the input cavity to the outlet cavity, anda plurality of tubes extending through the heat exchanger portion from the first side to the second side, wherein each tube extends through the baffles so as to define a second fluid path through the heat exchanger portion,the heat exchanger further comprising;a cooling input cavity positioned on the first side of the heat exchanger portion; anda cooling output cavity positioned on the second side of the heat exchanger portion, wherein the plurality of tubes extend through the heat exchanger portion from the cooling input cavity positioned on the first side to the cooling output cavity positioned on the second side. 16. A heat exchanger system comprising: at least two of the heat exchangers as in claim 1, wherein the heat exchangers serially connected to each other with respect to the first flow path, and wherein the heat exchangers are serially connected to each other with respect to the second flow path.