| 摘要 |
In a heat exchanger ( 10 ) for transferring heat from a first fluid to a second fluid, which heat exchanger ( 10 ) comprises one or more flow passages ( 12 ) for a first fluid, the outer wall ( 26 ) of these passages is in heat-transferring contact with a flow body ( 20 ) made from metal foam for a second fluid. This metal foam has a gradient of the volume density of the metal, so that it is possible to achieve a favorable equilibrium between heat transfer and conduction, on the one hand, and flow resistance, on the other hand.
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