Method for making enhanced heat transfer surfaces
AssigneeWieland-Werke AG
InventorsPetur Thors, Nikolai Zoubkov
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Abstract
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.
Claims19
A method of manufacturing a tube having a surface, at least two primary grooves located along the surface, and a longitudinal axis, the method comprising:
- a. using a tool having a tool tip (i) to cut with the tool tip through the surface of the tube located between the at least two primary grooves to a cutting depth, and at an angle relative to the longitudinal axis, to form layers, wherein at least one layer is formed by cutting with the tool tip through the surface of the tube at two different angles relative to the longitudinal axis;
- and (ii) to lift the layers relative to the surface with the tool tip to form a plurality of protrusions, wherein at least some of the protrusions are adjacent each other,
- wherein at least one of the plurality of protrusions comprises a protrusion base and a protrusion tip and wherein the protrusion tip is more distal the surface than the protrusion base and thicker than the protrusion base.
A method of manufacturing a tube having at least two primary grooves, and a surface located between the at least two primary grooves and having a width, the method comprising:
- a. cutting through, and across the width of, the surface to a cutting depth and at an angle relative to the longitudinal axis to form layers, wherein at least one layer is formed by cutting through the surface at two different angles relative to the longitudinal axis;
- and
- b. upwardly lifting the layers relative to the surface to form a plurality of protrusions and a plurality of secondary grooves extending between the at least two primary grooves,
- wherein at least one of the plurality of protrusions comprises a base and a protrusion tip and wherein the protrusion tip is more distal the surface than the base and thicker than the base.
Dependencies are inferred from the claim text.