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Repeating and Alternating Folded Plate-Fins for Improved Thermal Performance and Rigidity in Plate-Fin Heat Sinks

IP.com Disclosure Number: IPCOM000112828D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 85K

Publishing Venue

IBM

Related People

Sathe, SB: AUTHOR [+2]

Abstract

Disclosed is a method of obtaining improved cooling over conventional plate fin laminates (Fig. 1). The manufacturing process involves (1) stamping plate-fins from conventional multigage strip, (2) milling or skiving flow channels in the fins (Fig. 2) and finally bonding them back-to-back to form the continous structure in Fig. 1.

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Repeating and Alternating Folded Plate-Fins for Improved Thermal
Performance and Rigidity in Plate-Fin Heat Sinks

      Disclosed is a method of obtaining improved cooling over
conventional plate fin laminates (Fig. 1).  The manufacturing process
involves (1) stamping plate-fins from conventional multigage strip,
(2) milling or skiving flow channels in the fins (Fig. 2) and finally
bonding them back-to-back to form the continous structure in Fig. 1.

      In this invention, folded plate fins (Fig. 2, dotted contour)
are used instead of straight fins, with similar manufacturing process
as the straight fin heat sink, with the exception of an additional
step of folding the fin prior to bonding.

      In one embodiment of this invention (Folded Plate-Fin Laminate)
as shown in Fig. 3, the fins are laminated with a flat spacer sheet
between adjacent fins.  The depth of the folds is equal to the height
of the step in thickness of the multigage stock material; the depth
and pitch of the folds will be approximately equal.  Using the
nomenclature in Fig. 3, the area ratio of the folded fin flow channel
(Af) to parallel plate flow channel (A0) is Af/A0 = 1 - ((c-r)/p).
Consequently, in a 1 mm wide channel, the advantage of folds on a 1
mm pitch  and rib thickness (r) = 0.25 mm is a 75 percent increase in
surface area.  Since the folds join the adjacent fins in intimate
thermal contact, heat spreading does not solely take place in the
base but also in the fins over the entire fin height.  Finally, fin
to fin joints increase the overall structural rigidity substantially.

      In another embodiment, the Alternate Folded Plate-Fin Laminate
(Fig. 4), a pair of folded fi...