Heat transfer surface for efficient boiling of liquid R-11 and i

Details Heat transfer surface for efficient boiling of liquid R-11 and i Heat transfer surface for efficient boiling of liquid R-11 and i

1981-05-07

1982-10-19

Beck, Shrive P.

Heat exchange

With coated, roughened or polished surface

62527, 427422, 427423, B05D 308, B05D 110

Patent

active

043545505

ABSTRACT:
A heat transfer surface for boiling liquid refrigerant 11 and its equivalents and method for producing the surface. The surface comprises a porous, open-cell coating at least 15 mils thick, of oxidized metallic particles which are flame-sprayed onto a metal substrate. This surface includes a substantial number of nucleate boiling cavities having an equivalent radius in the range of 1.5 to 4 mils, which are the result of one or more of the following conditions in the flame-spraying process: (1) The flame-spraying nozzle is oriented so that the metallic particles impact the metal substrate at an angle in the range of 30.degree. to 75.degree.; (2) The metal substrate is preheated to a temperature which is at least 600.degree. F., but below the melting point of the substrate; and (3) The flame-spraying apparatus is positioned such that the metallic particles travel from 3 to 6 inches before impacting the substrate. These conditions create a porous coating with substantially more nucleate boiling cavities of the required size for boiling liquid R-11 than the flame-spraying process disclosed in the prior art.

REFERENCES:
patent: 3340084 (1967-09-01), Eisenlohr
patent: 3384154 (1968-05-01), Milton
patent: 3390862 (1976-11-01), Dahl et al.
patent: 3928907 (1975-12-01), Chisholm
patent: 3942230 (1976-03-01), Nalband
patent: 3990862 (1976-11-01), Dahl et al.
patent: 4099481 (1978-07-01), Lyons
patent: 4232056 (1980-11-01), Grant et al.

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