Heat transfer tubes and method for manufacturing

Details Heat transfer tubes and method for manufacturing Heat transfer tubes and method for manufacturing

1990-08-28

1991-10-01

Rivell, John

Heat exchange

With coated, roughened or polished surface

165179, 165183, 165184, 138 38, F28F 140

Patent

active

050524763

ABSTRACT:
A heat transfer tube having an inner surface in which are formed primary grooves and secondary grooves. The primary grooves parallel to one another, extending at an angle to the longitudinal direction of the heat transfer tube and secondary grooves parallel to one another, extending an angle to the primary grooves. At the intersections of the primary and secondary grooves is formed a series of pear-shaped grooves whose inner opening dimension is smaller than the dimension of the bottom of the pear-shaped groove.

REFERENCES:
patent: 3885622 (1975-05-01), McLain
patent: 4004441 (1977-01-01), Leszak
patent: 4166498 (1979-09-01), Fujie et al.
patent: 4216826 (1980-08-01), Fujikake
patent: 4458748 (1984-07-01), Yamada et al.
patent: 4733698 (1988-03-01), Sato

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