Heat exchanger tube

A heat exchanger tube having a tube longitudinal axis, the heat exchanger tube comprising:

• a tube wall, an outer tube face and an inner tube face;
• axially parallel or helically circumferential fins formed on at least one of the outer tube face or the inner tube face, the fins being formed from the tube wall and extending continuously along tube wall;
• continuously extending primary grooves formed between respectively adjacent fins;
• and
• each of the fins are subdivided into a plurality of fin sections, the fin sections of each fin periodically repeating longitudinally along the respective fin such that adjacent pairs of the fin sections are longitudinally spaced-apart from one another along the respective fin by a gap disposed therebetween, each fin section being divided into a multiplicity of projections each having a projection height, wherein the gap between adjacent fin sections of each fin has a greater longitudinal dimension than a dimension of a space defined longitudinally between adjacent projections of each fin section, and
• the projections are formed between the primary grooves by making cuts into the fins at a cutting depth transversely with respect to a longitudinal extent of the fin to form fin segments and by raising the fin segments in a main orientation along the longitudinal extent of the fin.