Finned tubing having enhanced nucleate boiling surface

Details Finned tubing having enhanced nucleate boiling surface Finned tubing having enhanced nucleate boiling surface

1975-09-03

1977-08-09

Dority, Jr., Carroll B.

Heat exchange

With coated, roughened or polished surface

F28F 1318

Patent

active

040404790

ABSTRACT:
An improved nucleate boiling surface can be obtained on a finned metal heat transfer tube by providing very narrow transverse gaps in its fins. The narrow gaps can be attained by knurling or otherwise deforming a smooth surfaced tube member to notch and partially work harden its surface and then subjecting the knurled portion to a finning operation. The resulting tube has fissure like gaps having a tapered width in the range of 0-0.006 inches in the tip area of the fins which become nucleation sites for boiling enhancement. In a metal working apparatus, by mounting the knurling rolls on the same arbors as the finning disks, a tube can be progressively knurled and then finned in a single pass through the apparatus. If desired, the tube can also be internally ridged as it is being externally finned.

REFERENCES:
patent: 3326283 (1967-06-01), Ware
patent: 3454081 (1969-07-01), Kun et al.
patent: 3566514 (1971-03-01), Szumigala
patent: 3789915 (1974-02-01), Ford
patent: 3893322 (1975-07-01), Campbell et al.
patent: 3906604 (1975-09-01), Kakizaki et al.

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