Heat transfer tube

Details Heat transfer tube Heat transfer tube

1980-07-14

1981-12-15

Richter, Sheldon J.

Heat exchange

Tubular structure

Projecting internal and external heat transfer means

138 38, 138154, 138173, 228145, F28F 108, F28F 106

Patent

active

043054609

ABSTRACT:
A spirally fluted metallic heat transfer tube is disclosed wherein the finished tube has improved heat transfer performance through the provision of a predetermined number range of multiple start continuous helical flutes formed along its longitudinal length, the flutes having specific helix angle relation and flute height to tube hydraulic diameter ratio so as to establish a ratio of thermal diffusivity to momentum diffusivity greater than 1.

REFERENCES:
patent: 1394311 (1921-10-01), Lang
patent: 2252045 (1941-08-01), Spanner
patent: 2874683 (1959-02-01), La Rue
patent: 3345590 (1967-10-01), Wolfgang et al.
patent: 3358112 (1967-12-01), Timmers
patent: 3578075 (1971-05-01), Winter
patent: 3601570 (1971-08-01), Davis
patent: 3612175 (1971-10-01), Ford et al.
patent: 3762468 (1973-10-01), Newson et al.
patent: 3779312 (1973-12-01), Withers, Jr. et al.
patent: 3826304 (1974-07-01), Withers, Jr. et al.
Ciftci, Huseyin, An Experimental Study of Filmwise Condensation on Horizontal Enhanced Condenser Tubing, Dec. 1979, Thesis, Naval Postgraduate School, Monterey, Calif.
Reilly, David J., An Experimental Investigation of Enhanced Heat Transfer on Horizontal Condenser Tubes, Mar. 1978, Thesis, Naval Postgraduate School, Monterey, Calif.
Newson et al., The Development of Enhanced Heat Transfer Condenser Tubing, AERE R-7318, UKAEA Research Group, atomic energy Research Establishment, Harwell, Jul. 1973.

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