HEAT EXCHANGER AND METHOD FOR MAKING THE SAME

摘要

A method is provided, the method including providing a first tubular structure that defines a first passage. A sacrificial material can be disposed in the first passage. A second tubular structure can be provided so as to be adjacent to the first tubular structure, with the second tubular structure defining a second passage within which can be disposed a granular material. The first and second tubular structures can be deformed together so as to reduce an external dimension of each of the first and second tubular structures. The sacrificial material can then be removed from the first passage.