A heat sink is a device that incorporates either a fan or some other means to keep a hot component, such as a processor , cool. There are two heat sink types: active and passive.
The picture to the right is an example of a heat sink that has both active and passive cooling mechanisms.
Active heat sink:
Active heat sinks utilize the computer’s power supply and most typically, fans Sometimes these types of heat sinks are referred to as an HSF, which is short for heat sink and fan. There are also liquid cooling systems, which have become more popular in recent years.
Tip: If you are looking to purchase a fan heat sink, we recommend those with ball bearing motors as they often last much longer than sleeve bearings.
Passive heat sink:
Passive heat sinks are those that have no mechanical components. Consequently, they are 100% reliable. Passive heat sinks are made of an aluminum finned radiator that dissipates heat through convection. For passive heat sinks to work to their full capacity, there should be a steady airflow moving across the fins.
Aluminum Heat Sink:
Heat sinks are generally made of metals; and, aluminum is the most common metal used in heat sink.We are aware of the fact that the thermal conductivity of each metal is different.The thermal conductivity of metal is proportional to the heat transfer in heat sink. Thus, if the thermal conductivity of the metal increases, then the heat transferring capacity of the heat sink will also increase.
The thermal conductivity of the aluminum is 235 W/mK; it is the cheapest and lightweight metal. Aluminum heat sinks are also called as extruded heat sinks as they can be made using extrusion.
Heat Sink Principle!