When you're looking for a good heat sink, one of the most important factors to consider is the method of heat dissipation. In thermodynamics, heat dissipation is heat transfer, and there are three main ways of heat transfer: heat conduction, heat convection, and heat radiation. Each method has its unique benefits and drawbacks.
Heat conduction is a phenomenon that occurs through the interaction of neighboring atoms and molecules, transferring their heat to their neighbors.In heat conduction, the heat sink emits heat through direct contact with another object.
Convection is the transfer of heat from one place to another due to the movement of fluid. In heat convection, the heated air rises and is replaced by cooler air, which then absorbs the heat from the object. Convection is the most common method of heat dissipation, and it's very efficient at transferring heat over a small distance.
So the hotter the object gets, the more thermal energy it will transfer to the cooler object. This is what helps to cool the heat sink down.
Thermal radiation is electromagnetic radiation generated by the thermal motion of particles in matter. And in heat radiation, infrared radiation is emitted from the object and transferred to another object.
Each method has its benefits and drawbacks, so it's important to understand them before you make a purchase. You'll need to decide which one is best for your specific situation.