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Natural Convection > Folded, Bonded, Stacked Fin

Folded, Bonded, Stacked Fin

Folded Fin heat sinks are a good solution when looking for a medium to high density fin structure that is short in height (<2"). Generally formed from either copper or aluminum, a long sheet of material is folded back and forth to produce the fins. Depending upon the fin spacing and height, the fin tips can be flat or rounded. There are also special configurations, such as lanced offset and wavy, which can be used to improve the heat transfer ability of the heat sink. The fins are attached by either solder or thermal epoxy to a base usually made of aluminum or copper. Folded fin heat sinks can also be used inside a liquid cold plate as a way of increasing surface area and improving performance. Because of the manufacturing method, holes and cutouts in the fins can be time consuming to produce, so extra effort should be made in the design stage to minimize these features.

Bonded fins are a good high power solution for either natural or forced convection. Individual straight fins are cut and bonded into a grooved base plate. The fins are usually thicker than you would find on a zipper/skived or folded fin, so they have the ability to be more efficient, even at tall heights. Aluminum and copper fins can be combined on the same heat sink to provide improved performance without all of the weight gain. If weight is especially important, graphite fins can also be used, but they are more delicate so extra care must be taken. Wakefield-Vette produces some standard sizes, and some of the sizes can be purchased with a bracket for easy mounting of a fan.

In certain applications it is helpful to have devices mounted to both the top and bottom of a heat sink with a fin structure in between for compactness. While this can be accomplished using a sandwich bonded fin, another method is the stack fin heat sink. An individual fin is extruded so that it looks like an “I”. There are interlocking features in both top and bottom bases. A series of the fins are stacked side by side and compressed together to form a heat sink. The top and bottom surface of each base is machined to ensure a flat mounting surface and then any secondary features are added. Depending upon the construction of the interlocking features, thermal epoxy can be used between the sections to improve the performance. As you can see technology has helped playing real money casino games on mobile using mobile app from Australia such as online casino Australia