Construction of a heat transfer wall of a heat transfer pipe

Details Construction of a heat transfer wall of a heat transfer pipe Construction of a heat transfer wall of a heat transfer pipe

1985-09-18

1987-12-29

Cline, William R.

Heat exchange

With coated, roughened or polished surface

165179, 165110, 165184, F28F 1318, F28F 1902

Patent

active

047154365

ABSTRACT:
A heat transfer tube has at least a row of projections provided on its inner surface at regular intervals along a spiral curve thereof. The row of projections are formed by plastic deformation of part of the heat transfer tube, which is effected by pressing a rolling disc having projections against the outer surface of the heat transfer tube. The projections have smooth curved surfaces. The height of the projections ranges from 0.45 mm to 0.6 mm, their pitch along the spiral curve ranges from 3.5 mm to 5 mm, and their pitch in the axial direction ranges from 5 mm to 9 mm.

REFERENCES:
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patent: 3734140 (1973-05-01), Nakamura et al.
patent: 3847212 (1974-11-01), Withers, Jr. et al.
patent: 4166498 (1979-09-01), Fujie et al.
patent: 4314587 (1982-02-01), Hackett
patent: 4330036 (1982-05-01), Satoh et al.
patent: 4332294 (1982-06-01), Drefahl et al.
patent: 4425942 (1984-01-01), Hage et al.
patent: 4549606 (1985-10-01), Sato et al.

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