The way of heat dissipation refers to the main way the radiator emits heat. In thermodynamics, heat dissipation is heat transfer, and there are three main ways of heat transfer: heat conduction, heat convection and heat radiation. The material itself or when the material contacts the material, the transfer of energy is called heat conduction, which is the most common way of heat transfer. For example, the direct contact between the CPU heat sink base and the CPU to take away heat is heat conduction. Thermal convection refers to the heat transfer method in which the flowing fluid (gas or liquid) moves the heat away. In the heat dissipation system of the computer case, the "forced heat convection" heat dissipation method in which the cooling fan drives the gas flow is more common. Thermal radiation refers to the transfer of heat by radiation. The most common thing in daily life is solar radiation. These three heat dissipation methods are not isolated. In daily heat transfer, these three heat dissipation methods all happen at the same time and work together.
In fact, any type of radiator will basically use the above three heat transfer methods at the same time, but the focus is different. For example, an ordinary CPU air-cooled radiator, the CPU heat sink is in direct contact with the surface of the CPU, and the heat on the CPU surface is transferred to the CPU heat sink through thermal conduction; the cooling fan generates airflow to take away the heat from the surface of the CPU heat sink through thermal convection; The flow of air also takes away the heat of the air around the CPU heat sink through thermal convection until it reaches the outside of the chassis; at the same time, all parts with high temperature will radiate heat from the parts with low surrounding temperature.
The heat dissipation efficiency of the heat sink is related to the heat conductivity of the heat sink material, the heat capacity of the heat sink material and the heat dissipation medium, and the effective heat dissipation area of the heat sink.
Air-cooled heat dissipation is the most common, and very simple, is to use a fan to take away the heat absorbed by the radiator. It has the advantages of relatively low price and simple installation, but it is highly dependent on the environment. For example, the heat dissipation performance will be greatly affected when the temperature rises and overclocking.
heat pipe is a heat transfer element with extremely high thermal conductivity. It transfers heat through the evaporation and condensation of liquid in a fully enclosed vacuum tube. It uses fluid principles such as hair absorption to achieve a cooling effect similar to a refrigerator compressor. It has a series of advantages such as extremely high thermal conductivity, good isothermality, the heat transfer area on both sides of the cold and heat can be changed arbitrarily, heat can be transferred over a long distance, and temperature can be controlled, and the heat exchanger composed of heat pipes has heat transfer efficiency High, compact structure, low fluid resistance and other advantages. Due to its special heat transfer characteristics, the tube wall temperature can be controlled to avoid dew point corrosion.
Liquid cooling is the use of liquid under the drive of a pump to forcefully circulate heat away from the radiator. Compared with air cooling, it has the advantages of quietness, stable cooling, and less dependence on the environment. However, the price of heat pipes and liquid cooling is relatively high, and installation is relatively troublesome.