Method for providing improved nucleate boiling surfaces

Details Method for providing improved nucleate boiling surfaces Method for providing improved nucleate boiling surfaces

B - Operations, Transporting

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26/146, 257/27

B21H 3/12 (2006.01) B21C 37/20 (2006.01) B21H 7/14 (2006.01) F28F 1/12 (2006.01)

Patent

CA 1038145

ABSTRACT OF THE DISCLOSURE An improved nucleate boiling surface can be obtained on a metal heat transfer tube or other form of heat transfer member by knurling or otherwise deforming a smooth surfaced member to notch and partially work harden its surface and then subjecting the knurled portion to a finning operation. The method results in small splits or ruptures of a controlled geometry and depth being produced in the tip area or the fins which become nucleation sites for boiling enhancement. Pre- ferably, the knurling rolls are mounted on the same arbors as the finning discs so that a tube is progressively knurled and then finned in a single pass through the apparatus. If desired, the tube can also be internally ridged as it is being extern- ally finned.

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