Split resistant tubular heat transfer member

Details Split resistant tubular heat transfer member Split resistant tubular heat transfer member

1991-05-20

1994-01-04

Rivell, John

Heat exchange

With coated, roughened or polished surface

165179, F28F 140

Patent

active

052752348

ABSTRACT:
The improved split resistant tubular heat transfer member of the present invention is directed to an elongated tube having a substantially circular transverse cross-section. The elongated tube hereof has an outer surface and an inner surface, and further has an outer diameter, a defined wall thickness, and an inner diameter. The tube inner surface has disposed therein a plurality of spiral grooves, defining and separating a corresponding plurality of spirally disposed fins extending from the inner diameter of the tube. The respective spirally disposed fins have an inverted substantially V-shape and have further an apex angle of approximately 28.degree.. In some such preferred embodiments the spiral grooves have a ratio of the cross-sectional area thereof to the depth thereof of approximately 0.01475 inches.

REFERENCES:
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patent: 3847212 (1974-11-01), Withers, Jr. et al.
patent: 4044797 (1977-08-01), Fujie et al.
patent: 4118944 (1978-10-01), Lord et al.
patent: 4658892 (1987-04-01), Shinohara et al.
patent: 4660630 (1987-04-01), Cunningham et al.
patent: 4809415 (1989-03-01), Okayama et al.
patent: 4938282 (1990-07-01), Zohler

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