Honeycomb type heat exchanger, method of fabricating and engine equiped with such a heat exchanger

The exchanger has a principal duct (40) for circulating primary fluid and a honeycomb cellular structure (42) exchanging temperature between exterior and interior of the duct. The duct extends axially in a radial zone of the structure, in parallel to channels (44). A central part of the duct is formed by a set of channels delimiting the structures internal and external part in which primary and secondary fluid is circulated. Independent claims are also included for the following: (a) a process for fabricating heat exchanger (b) an internal combustion engine of an automobile vehicle.