Heat transfer surface and method of manufacture

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

1977-07-13

1979-07-03

Richter, Sheldon Jay

Heat exchange

With coated, roughened or polished surface

62527, 165184, F28F 136, F28F 1302

Patent

active

041597397

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: 3299949 (1967-01-01), Beurtheret
patent: 3326283 (1967-01-01), Ware
patent: 3454081 (1969-07-01), Kun et al.
patent: 3487670 (1970-01-01), Ware
patent: 3496752 (1970-02-01), Kun et al.
patent: 3566514 (1971-03-01), Szumigala
patent: 3696861 (1972-10-01), Webb
patent: 3768290 (1973-10-01), Zatell
patent: 4050507 (1977-09-01), Chu et al.
Heat Transfer in Evaporation, Jacob, vol. I, pp. 620-641.

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