Heat exchange surface with porous coating and subsurface cavitie

Details Heat exchange surface with porous coating and subsurface cavitie Heat exchange surface with porous coating and subsurface cavitie

1981-05-18

1982-11-16

Richter, Sheldon J.

Heat exchange

With coated, roughened or polished surface

62527, 165DIG10, F28F 1318

Patent

active

043590861

ABSTRACT:
A heat exchange surface having nucleate boiling cavities defined by subsurface cavities in combination with a thin porous coating. A preferred embodiment of the heat exchange surface includes a plurality of helical fins formed on the outer surface of a metallic tube, the tips of which are deformed by rolling to define gaps opening into fin cavities between adjacent fins. A porous open-celled coating flame-sprayed on the deformed portion of the fins substantially bridges these gaps, except at random open points caused by the inherent porosity of the coating. These openings in the porous coating in combination with the fin cavities provide nucleate boiling sites which promote efficient heat transfer for boiling a liquid.

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patent: 3696861 (1972-10-01), Webb
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patent: 4179911 (1979-12-01), Saier et al.
patent: 4182412 (1980-01-01), Shum
patent: 4232056 (1980-11-01), Grant et al.
patent: 4258783 (1981-03-01), Alber
Heat Transfer from Silicon Chips and Wafers, Noth, IBM Technical Disclosure Bulletin, vol. 17, No. 12, May 1975, p. 3544.
Tubular Hollow Cathode Sputtering onto Substrates of Complex Shape, Thornton et al., J. Vac. Sci. Technol., vol. 12, No. 1, Jan./Feb. 1975, pp. 93-97.
Snap-on Nucleate Boiling Promoter, Chu et al., IBM Technical Disclosure Bulletin, vol. No. 3, Aug. 1968, pp. 277-278.

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