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The heat sink thermal resistance model consists of two resistances, namely the resistance in the heat sink base, , and the resistance in the fins, . The heat sink base thermal resistance, , can be written as follows if the source is a uniformly applied the heat sink base. If it is not, then the base resistance is primarily spreading resistance:
Aluminum is also much lighter than copper, offering less mechanical stress on delicate electronic components. Some heat sinks made from aluminum have a copper core as a trade off. The heat sink's contact surface (the base) must be flat and smooth to ensure the best thermal contact with the object needing cooling.
One-piece finned heat sinks are produced by extrusion, casting, skiving, or milling. ... computer CPU heatsinks, and heat exchangers in power plants. [3] [4] ...
Passive heatsink cooling involves attaching a block of machined or extruded metal to the part that needs cooling. A thermal adhesive may be used. A thermal adhesive may be used. More commonly for a personal computer CPU, a clamp holds the heatsink directly over the chip, with a thermal grease or thermal pad spread between.
Extrusion is a process used to create objects of a fixed cross-sectional profile by ... mullions, and heat sinks. Brass is used to extrude corrosion free rods ...
First, consider noting that the term "heat sink" is a misnomer and that this expression is not found in heat transfer textbooks. A heat sink is a collection of extended fin surfaces (Hot Air Rises and Heat Sinks, Kordyban). Second, consider distinguishing between bonded fin heat sinks and extruded fins, augmented bonded fin heat sinks, etc.
Instead, it is usually formed by extrusion or rolling. It is commonly used in the electrical and chemical industries, on account of having high electrical conductivity, corrosion resistance, and workability. 1050 alloy is also sometimes used for the manufacture of heat sinks, since it has a higher thermal conductivity than other alloys. It has ...
Extrusion profiles with holes are very difficult to produce because they can not be just produced by a simple die, so it should be practiced to reduce the number of holes as much as possible. With steels and other less extrudable materials, holes in asymmetrical shapes should be avoided because they lead to unsymmetrical stresses which cause ...