Heat sink fans – What are heat sink fans – How computer removes excess of heat

What are Heat sink fans?

A heat sink is a heat exchanger that transfers the heat generated by mechanical devices to a medium (often air or liquid coolant) which dissipates heat away from the device, thus preventing the mechanical device from heating up.

A fan is often used in combination with the heat sink which helps to blow hot air away from the device

Heat sink cools down the computer processor when it is used at full capacity and prevents the processor from heating.

How heat sink fans work?

The heat sink has a thermal conductor that carries heat away from the CPU into fins that provide a large surface area for the heat to dissipate throughout the rest of the computer, thus cooling both the heat sink and processor. Both a heat sink and a radiator require airflow and, therefore, both have fans built in.

Heat sinks works on the principal of conduction.

Conduction – It is the process of transfer of heat from one solid to another solid when they come in direct contact with each other

One of the most common metals used in heat sinks is aluminium, Copper.

A fan inside the computer moves air across the heat sink and out the computer.

The heat sink is a thermal conductive material that quickly carries heat away from the processor. It is designed to have the greatest amount of surface area in a small volume of space, so aside from the flat contact surface the heat sink has many thin “fins” that facilitate heat dissipation through thermal convection, which means the heat is further carried away from the heat sink itself by air. Often the normal flow of air is not enough to allow for quick cooling, so a fan has to be added.

Following is a Heat sink fan on a motherboard

Heat sink fan

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