Introduction of heat dissipation of Aluminum Heat Sink
The heat dissipation means the main way of dissipating heat from the Aluminum Heat Sink. In thermodynamics, heat is heat transfer, and heat transmission methods are mainly three: heat conduction, thermal convection and thermal radiation. The material itself or when the material and material contact, the energy transfer is called heat conduction, which is the most common way of a heat transfer. For example, CPU heat sink base and CPU direct contact with the way heat is to heat conduction. Thermal convection refers to the flow of fluid (gas or liquid) to heat the heat transfer mode, in the computer chassis cooling system is more common is the cooling fan to drive the gas flow "forced thermal convection" cooling method. Heat radiation refers to rely on radiation radiation heat transfer, the most common daily is the solar radiation. These three kinds of cooling methods are not isolated, in the daily heat transfer, these three kinds of cooling methods are at the same time, work together.
In fact, any type of Aluminum Heat Sink will basically use the above three kinds of heat transfer, but the focus is different. Such as the ordinary CPU Aluminum Heat Sink, CPU heat sink and the CPU surface in direct contact with the CPU surface heat through the heat conduction to the CPU heat sink; cooling fan air flow through the heat convection on the surface of the CPU heat sink away; and the chassis air The flow is also through the heat convection of the CPU heat sink around the air heat away until the chassis outside; while all the high temperature parts of the surrounding temperature will be part of the low heat radiation.
The heat dissipation efficiency of the Aluminum Heat Sink is related to the thermal conductivity of the Aluminum Heat Sink material, the heat capacity of the Aluminum Heat Sink material and the heat dissipation medium, and the effective heat dissipation area of the Aluminum Heat Sink.
In accordance with the heat from the Aluminum Heat Sink way, you can divide the Aluminum Heat Sink is the active cooling and passive cooling, the former is common air-cooled Aluminum Heat Sink, which is the common heat sink. Further subdivision cooling method, can be divided into air-cooled, heat pipe, liquid cooling, semiconductor refrigeration and compressor cooling and so on.
Air cooling is the most common, and very simple, is the use of fans to take away the heat absorbed by the Aluminum Heat Sink. With relatively low price, easy to install, etc., but the environment is relatively high, such as the temperature rise and overclocking its thermal performance will be greatly affected.
A heat pipe is a heat transfer element with a very high thermal conductivity that conveys heat by evaporating and condensing the liquid in a fully enclosed vacuum tube. It utilizes the fluid principle of fluff and suction to act like a refrigerator compressor. Has a very high thermal conductivity, good isothermal, hot and cold sides of the heat transfer area can be arbitrarily changed, can be long-distance heat transfer, can control the temperature and a series of advantages, and heat pipe composed of heat exchanger with heat transfer efficiency High, compact structure, small resistance to fluid and other advantages. Because of its special heat transfer characteristics, which can control the wall temperature, to avoid dew point corrosion.
Liquid cooling is the use of liquid in the pump driven by the cycle of taking away the heat of the Aluminum Heat Sink, compared with the air cooling has a quiet, stable cooling, the advantages of small dependence on the environment. But the heat pipe and liquid cold price is relatively high, and the installation is also relatively cumbersome.
In the purchase of Aluminum Heat Sink, according to their actual needs and economic conditions to buy, the principle is enough to use.