Heat exchanger with barrier passages

A heat exchanger configured to transfer heat between a first fluid and a second fluid, the first fluid being fluidly isolated from the second fluid, the heat exchanger comprising:

• a heat exchanger core comprising:
• a plurality of first fluid flow assemblies, each configured to direct flow of the first fluid through the heat exchanger core, each of the first fluid flow assemblies comprising:
• a plurality of inner channels, each formed by an associated inner channel wall and configured to contain the first fluid;
• and
• a plurality of barrier channels, each surrounding an associated inner channel;
• and
• one or more second fluid channels, each configured to channel flow of the second fluid through the heat exchanger core;
• wherein:
• each of the plurality of barrier channels comprises:
• a barrier channel wall, configured to isolate the barrier channel from the second fluid;
• and
• one or more barrier channel vanes, configured to support the inner channel within the barrier channel;
• each of the barrier channels is configured to provide a void space between the inner channel wall and the barrier channel wall, thereby fluidly separating the first fluid from the second fluid;
• and
• each of the barrier channels is configured to receive the first fluid in the event of a breach of the inner channel wall and receive the second fluid in the event of a breach of the barrier channel wall;
• an inlet plenum configured to receive the first fluid from a first fluid inlet, the inlet plenum comprising a plurality of plenum vanes defining the plurality of inner channels therebetween, each of the plurality of inner channels sandwiched between two barrier channels;
• an outlet plenum configured to discharge the first fluid to a first fluid outlet, the outlet plenum comprising a plurality of plenum vanes defining the plurality of inner channels therebetween, each of the plurality of inner channels sandwiched between two barrier channels;
• an inlet transition region, disposed between the inlet plenum and the heat exchanger core, the inlet transition region configured to change an orientation of each of the plurality of inner channels and respective barrier channels of the plurality of barrier channels from a sandwiching configuration to a coaxial configuration;
• and
• an outlet transition region, disposed between the heat exchanger core and the outlet plenum, the outlet transition region configured to change an orientation of each of the plurality of inner channels and respective barrier channels of the plurality of barrier channels from a coaxial configuration to a sandwiching configuration.