Heat transfer surface and method of manufacture

Details Heat transfer surface and method of manufacture Heat transfer surface and method of manufacture

F - Mech Eng,Light,Heat,Weapons

28

F

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F28F 1/36 (2006.01) B21C 37/20 (2006.01) B23P 15/26 (2006.01) F28F 1/26 (2006.01) F28F 13/02 (2006.01) F28F 13/18 (2006.01)

Patent

CA 1150723

ABSTRACT A heat transfer surface for nucleate boiling of liquids is formed on the outer surface of a heat exchanger tube. Helical ridges having two fins each encase the tube. A fin at each ridge is angled toward the adjacent fin on the adjacent ridge forming a gapped cavity therebetween. The method of making the tube includes rolling alternating deep grooves and shallow grooves in the outside surface of the tube and then flaring the fins to form the gapped cavity.

307146

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