The invention relates to enhanced heat transfer surfaces and methods and
tools for making enhanced heat transfer surface. Certain embodiments
include a boiling surface that include a plurality of primary grooves,
protrusions and secondary grooves to form boiling cavities. The boiling
surface may be formed by using a tool for cutting the inner surface of a
tube. The tool has a tool axis and at least one tip with a cutting edge
and a lifting edge. Methods for making a boiling surface are also
disclosed, including cutting through the inner surface of a tube to form
primary grooves, then cutting and lifting the inner surface to form
protrusions and secondary grooves.