Internally finned tube

Details Internally finned tube Internally finned tube

1977-06-09

1979-08-07

Scott, Samuel

Heat exchange

Tubular structure

Projecting internal and external heat transfer means

138 38, 291573R, 138112, F28F 140

Patent

active

041634748

ABSTRACT:
Fluid-carrying tubes for a heat exchanger are provided with internal longitudinal fins formed separately from the tube itself. One form utilizes individual elongated V-shaped strips biased radially outwardly by an annular sheet metal spring, with the tips of the fins brazed to the inner surface of the tube wall. Second and third embodiments utilize a one-piece corrugated sheet metal cylinder rather than individual strips, but with adjacent fins being almost completely severed from each other to provide sharp edge contact between the tips of the fins and the tube wall for optimum brazing. Either the fins or tube inner wall is clad with a lower-melting point material which permits furnace brazing of the fin tips to the tube wall. All three forms have longitudinally spaced holes and slots to enhance heat exchange by inducing transverse fluid flow through the fins and to allow liquid levels to equalize.

REFERENCES:
patent: 2032134 (1936-02-01), Larkin
patent: 2079144 (1937-05-01), Abba
patent: 3200848 (1965-08-01), Takagi
patent: 3208131 (1965-09-01), Ruff et al.
patent: 3359616 (1967-12-01), Butt
patent: 3426176 (1969-02-01), Simon
patent: 3473348 (1969-10-01), Bottum
patent: 3477499 (1969-11-01), Goetz

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