Heat Sink Types And Design Pdf

heat sink types and design pdf

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This review paper summarizes constructal design progress performed by the authors for eight types of heat sinks with ten performance indexes being taken as the optimization objectives, respectively, by combining the methods of theoretical analysis and numerical calculation. And the ten performance indexes are heat transfer rate maximization, maximum thermal resistance minimization, minimization of equivalent thermal resistance which is defined based on the entransy dissipation rate equivalent thermal resistance for short , field synergy number maximization, entropy generation rate minimization, operation cost minimization, thermo-economic function value minimization, pressure drop minimization, enhanced heat transfer factor maximization and efficiency evaluation criterion number maximization, respectively.

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Generally, heat sinks are grouped by the manufacturing process used to create them, i. We will discuss 6 below. All heat sinks can be broken down into two major categories… active and passive.

What is a Heat Sink and its Importance

Generally, heat sinks are grouped by the manufacturing process used to create them, i. We will discuss 6 below. All heat sinks can be broken down into two major categories… active and passive.

What is the difference between active and passive heat sinks? Active Heat Sinks These generally have a fan or blower of some kind. The most common type is a ball bearing motor fan. These provide excellent performance, but they consist of moving parts and are on the expensive side. These have no mechanical components. They only use the convection process to dissipate thermal energy. Because they have no moving parts, they are more reliable. But they should still have continuous air flow across their fins.

Example of an Active Heat Sink. Heat sinks are usually made from aluminum or copper. Each has its own advantages. Aluminum Heat Sinks Aluminum is the most common material for heat sinks. In particular, extruded aluminum heat sinks fit the needs of most projects. The metal is lightweight and has relatively good thermal conductivity.

Copper has even better thermal conductivity than aluminum. The metal is sometimes used where the importance of thermal conductivity outweighs weight savings. Copper Heat Sink Fins. Each heat sink manufacturing process has its own advantages and drawbacks. There are a number of different ways to make heat sinks.

The majority of heat sinks are made from extruded aluminum. The process is useful for most applications.

Extruded heat sinks come at a low cost and custom specifications can be easily manufactured. The performance of extruded heat sinks can range from low to high. Their main downside, though, is that dimensions are limited by the maximum width of extrusion. Learn more.

These are normally used for applications that require large-sized heat sinks. One benefit of these is that the base material and fin material can be different. Also, a combination of aluminum and copper fins can be used instead of just one fin material. This allows you to improve thermal performance while adding a minimal amount of weight. Bonded-fin heat sinks generally offer moderate performance and come at a high cost.

Heat sinks produced through this method are normally made from copper. They are produced from a solid block of metal. These heat sinks offer high design flexibility and you can achieve high fin-density. This creates more surface area and opportunity for heat dissipation. They offer medium to high performance, but their drawbacks are generally high weight and directional sensitivity. In this process, metal fins are stamped and then soldered onto the base.

These are generally used for low-power applications. The advantage of stamped heat sinks is their very low cost due to ease of production automation. However, the biggest drawback is low performance. Forged heat sinks are made by compressing aluminum or copper and have many applications. Heat sinks can be cold forged or hot forged. These offer medium performance and can be made at low cost for high volumes. However, they offer limited design capabilities.

These offer high thermal conductivity, and you can achieve the most complex geometries with this process. This means you have plenty of flexibility in your design. But, they come at a high cost and the production time for each piece can make them less-than-ideal for high volumes. Heat sinks help absorb and dissipate the heat generated by electronic devices. You need to be sure you choose the appropriate type based on your design needs and volume requirements. Remember that sometimes active heat sinks are required for enhanced heat dissipation.

But passive heat sinks with no moving parts can be used as well. Also, when it comes to materials, aluminum offers weight and cost savings, while copper allows the highest level of thermal conductivity. From extrusion and bonding to forging and machining, there are a number of different manufacturing options available. Each has its advantages and drawbacks. Home Extruded Aluminum Heat Sinks.

Heat sinks absorb and dissipate the heat from these devices, helping to keep them cool. Passive Heat Sinks These have no mechanical components. There are two materials generally used to make heat sinks.

Heat Sink Materials: Aluminum vs. Copper Heat sinks are usually made from aluminum or copper. Copper Heat Sinks Copper has even better thermal conductivity than aluminum. When discussing the different types of heat sinks, we generally classify them based on their manufacturing process.

Learn more 2 — Bonded Heat Sinks These are normally used for applications that require large-sized heat sinks. Learn more about our high-quality Asian manufacturing services below. Heat Sink Extrusion Services. Learn More. CNC Machining Services. Popular Posts. Follow Us on LinkedIn.


So,to conquer these negative aspects, heat sinks must be provided for cooling purpose. For the cooling purpose,it incorporates a fan or cooling device. And, this can be achieved in three different ways,such as convention, radiation and conduction. Whenever two objects with different temperature come in contact with each other,conduction occurs causing the fast-moving molecules of the high-heat object to collide with the slow-moving molecules of the cooler objects, and thus, transfers thermal energy to the cooler object, and this is termed as thermal conductivity. Similarly, heat sink transfers the heat or thermal energy from a high-temperature component to a low-temperature medium like air, water, oil, etc. Usually air is used as a low-temperature medium; and, if water is used as medium, then it is termed as cold plate. The heat sinks are classified into different categories based on different criteria.


A heat sink also commonly spelled heatsink [1] is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a fluid medium, often air or a liquid coolant, where it is dissipated away from the device, thereby allowing regulation of the device's temperature. Heat sinks are used with high-power semiconductor devices such as power transistors and optoelectronics such as lasers and light-emitting diodes LEDs , where the heat dissipation ability of the component itself is insufficient to moderate its temperature. A heat sink is designed to maximize its surface area in contact with the cooling medium surrounding it, such as the air. Air velocity, choice of material, protrusion design and surface treatment are factors that affect the performance of a heat sink.

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I would like to sign up to receive news and updates from SimScale. See Privacy Policy. Diodes, transistors, and integrated circuits generate considerable amounts of heat during operation. Extreme heat can damage or significantly affect the performance of semiconductor devices, and therefore, supplemental cooling is necessary to maintain the temperature within the limits specified by a manufacturer. Whereas some electronic components can dissipate heat on their own, most optoelectronic devices—like lasers and power transistors such as MOSFETs and IGBTs—cannot sufficiently dissipate heat without a heat management solution.

6 Factors to Consider for a Better Heat Sink Design

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Предмет, который она держала, был гораздо меньшего размера. Стратмор опустил глаза и тут же все понял. Время для него остановилось. Он услышал, как стучит его сердце.

Constructal design progress for eight types of heat sinks

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