What is a heat exchanger?
Let's start with your definition. The heat pipe is called a "heat transfer device," whose name is translated from English as "heat pipe." And it's actually pipes that have all the right definition, transfer heat from one component to another, in the case of PC heatsinks, which transfer the heat produced by the processor or GPU, to the aluminum sheets of the cooling heatsinks later through the fans.
The main goal of heat treatment is that they have high heat efficiency, this is understood as the ability of heat exchangers, whether hot or cool. This thermal conductivity is important so that the heat generated by the CPU (we will rely on this only for short) is quickly transferred to the heatsink and can be turned off.
For this reason in almost all hot spots They are made of copper, the best thermal conductivity is the second largest in silver. Copper is used, of course, because it is much cheaper than silver and the difference between the two materials is not very great (418 W / KM for silver vs 385 W / KM for copper). By the way, even though gold has a higher saturation of electricity than copper, it has a very poor conductivity (308 W / KM).
Note: W / KM in watts (W) divided by degrees Kelvin (K) per meter (M).
Heat duct with room with steam
There are solid heat pipes, or they usually have chips inside to increase the heat transfer. But the best ones are those who use the steam room, because they have fluid inside which, with heat, converts to smoke again he walks fast
Obviously, these types of heat pipes are bad and can only be used on certain heatsinks. For a liquid, when it regenerates with the liquid and after cooling down, comes in the first place, it can only be used on heatsinks that are specifically placed. However, in some cases as in the navigation rooms of other graphics cards, the fluid has been introduced under pressure throughout the available volume, so you won't have to go for anything and will stay in the process during the smoke, which is also very effective in transferring heat.
Why use heat pumps in heatsinks?
In fact, because it's a way with price / efficiency ratio that exists today. And another one with less risk, because even though copper is a moving metal, and in the case of PC heatsinks it is rarely the case, They are usually laid out in plywood or nickel reducing this to electric current and thus resolving this distortion.
On the other hand, It is one of the most effective methods which exists to transfer heat from one part (CPU, GPU) to another (blocks of aluminum foil), and this is coupled with the fact that copper is the most common and inexpensive material in the world, making its use of the material more efficient.