Forming fins for heat exchangers - by transversely corrugating and folding about a longitudinally flattened portion for helical application

摘要

The fin can be bent so as to have a U- or L-shaped cross-section with the base of the section secured to the tube in use. When applying the strip it is wound helically around the tube. Firm securement of the strip to the tube over a relatively large area of contact is achieved without stress.