Heat transfer tubes and methods of fabrication thereof

Details Heat transfer tubes and methods of fabrication thereof Heat transfer tubes and methods of fabrication thereof

1995-06-07

1997-12-16

Flanigan, Allen J.

Heat exchange

With coated, roughened or polished surface

165184, 165DIG516, 165179, 165911, 2989005, F28F 116, F28F 142

Patent

active

056974302

ABSTRACT:
Metallic tubes (10,10') for boiling have an outer surface (12) for contacting a refrigerant and an inner surface (14) for contacting a liquid heat transfer medium to be chilled. The outer surface (12) has a plurality of radially outwardly extending helical fins (18); the tube inner surface (14) has a plurality of helical ridges (16). The fins (18) of the outer surface are notched to provide nucleate boiling cavities having pores (30). The fins (18) and notches (N) are so spaced that the pores (30) have an average area less than 0.00009 square inches and a pore density of at least 2000 per square inch on the tube outer surface. The helical ridges (16) on the inner surface have a predetermined ridge height and pitch and are positioned at a predetermined helix angle, the inner surface having a severity factor .PHI. in the range of 0.006 to 0.008. For use with high pressure refrigerants, angled grooving or notching in one direction is preferred; for use with low pressure refrigerants, a second set of notches at an angle to the first set is preferred.

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D.L. Gee & R.L. Webb "Forced Convection Heat Transfer in Helically Rib-Rougnened Tubes" pp. 1,127--1,136 (1980) International Journal of Heat Mass Transfer.

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