Heat transfer surface and method of manufacture

Details Heat transfer surface and method of manufacture Heat transfer surface and method of manufacture

1978-12-14

1982-10-12

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

72 78, 291573AH, B21D 5306, B21H 300

Patent

active

043532349

ABSTRACT:
A heat transfer surface for nucleate boiling of liquids is formed on the outer surface of a heat exchanger tube. Helical ridges having two fins each encase the tube. A fin at each ridge is angled toward the adjacent fin on the adjacent ridge forming a gapped cavity therebetween. The method of making the tube includes rolling alternating deep grooves and shallow grooves in the outside surface of the tube and then flaring the fins to form the gapped cavity.

REFERENCES:
patent: 3326283 (1967-06-01), Ware
patent: 3383892 (1968-05-01), Brothen
patent: 3753364 (1973-08-01), Runyan et al.
patent: 3768290 (1973-10-01), Zatell
patent: 3887004 (1975-06-01), Beck
patent: 4004441 (1977-01-01), Leszak
patent: 4168618 (1979-09-01), Saier et al.
patent: 4179911 (1979-12-01), Saier et al.

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