초록 ▼

There is provided heat exchange tube formed from a ductile metal strip which is formed into a generally circular configuration with the opposing longitudinal edges of the strip welded together. Both surfaces of the strip are enhanced. One surface of the tube is enhanced with protrusions in the shape

There is provided heat exchange tube formed from a ductile metal strip which is formed into a generally circular configuration with the opposing longitudinal edges of the strip welded together. Both surfaces of the strip are enhanced. One surface of the tube is enhanced with protrusions in the shape of truncated cones. The ratio of the pitch between longitudinally aligned protrusions and transversely aligned protrusions maximizes the formation and maintenance of vortexes in a flowing fluid along the tube surface.

대표청구항 ▼

[ We claim:] [1.] A method of manufacturing a heat exchange tube comprising:providing a ductile substrate having first and second services;passing said ductile substrate through a rolling mill to emboss a plurality of truncated conical protrusions on said first surface;forming the substrate into a t

[ We claim:] [1.] A method of manufacturing a heat exchange tube comprising:providing a ductile substrate having first and second services;passing said ductile substrate through a rolling mill to emboss a plurality of truncated conical protrusions on said first surface;forming the substrate into a tube so that the first surface becomes the inner surface of the tube and the second surface becomes the outer surface of the tube so that the protrusions are disposed in a plurality of longitudinal columns, such protrusions in each column having a first longitudinal pitch, the plurality of longitudinal columns comprising:a first subplurality of such columns each having such protrusions at a first set of longitudinal positions; anda second subplurality of such columns each having such protrusions at a second set of longitudinal positions, each column in the second subplurality located equidistant between two adjacent columns of the first subplurality, the second set of positions selected so that an angle .theta. between the downstream longitudinal direction and a line from each protrusion in the first subplurality and the next most downstream protrusion in an adjacent column of the second subplurality is greater than about 55 degrees and less than about 75 degrees. [4.] An elongate heat exchange tube for carrying a fluid in a longitudinal downstream direction having:an inner surface bounding an interior; andan outer surface,wherein the inner surface has a longitudinal surface direction and is formed with a plurality of longitudinal columns of substantially frustoconical protrusions into said interior, such protrusions in each such column having a first longitudinal pitch, the plurality of longitudinal columns comprising:a first subplurality of such columns each having such protrusions at a first set of longitudinal positions; anda second subplurality of such columns each having such protrusions at a second set of longitudinal positions, each column in the second subplurality located equidistant between two adjacent columns of the first subplurality, the second set of positions selected so that an angle .theta. between the downstream longitudinal direction and a line from each protrusion in the first subplurality and the next most downstream protrusion in an adjacent column of the second subplurality is greater than about 55 degrees and less than about 75 degrees.