Heat exchanger tube

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

• a tube wall, an outer tube face and an inner tube face;
• axially parallel or helically circumferential continuous fins formed from the tube wall on at least one of the outer tube face or the inner tube face;
• continuously extending primary grooves formed between respectively adjacent fins;
• the fins having at least one structured region on the at least one outer tube face or inner tube face;
• the structured region having a multiplicity of projections which project from the at least one outer tube face or inner tube face with a projection height, wherein the projections are separated by notch formations and wherein each projection has a tip;
• a plurality of the projections being shaped with respect to each other in pairs such that cavities are formed between adjacent projections, the tips of two of the projections disposed adjacent one another along the same fin are in contact with one another and are a first pair of contacting projections, and the tips of two of the projections disposed adjacent one another along the same fin are in contact with one another and are a second pair of contacting projections, the first and second pairs of contacting projections being disposed along the same fin, and at least one stand-alone projection is disposed between, and on the same fin as, the first and second pairs of contacting projections.