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Cooling Fan cooling is achieved through the heat transfer of the three ways
Hits：1928 Date：2016/11/15
As we all know, heat transfer is a natural phenomenon in nature. As long as there is a temperature difference between objects or between different parts of the same object, heat transfer occurs and will continue until the temperature is the same. The only condition for heat transfer is that there is a temperature difference that is independent of the state of the object and whether the object is in contact. The result of the heat transfer is that the temperature difference disappears, that is, the different parts of the object or objects that have heat transfer reach the same temperature.
1. Conduction: Heat conduction is the heat transfer phenomenon in the medium (medium is divided into: gas, liquid, solid, or mixed) without macroscopic movement, which can occur in solid, liquid and gas, but strictly speaking, only In the solid is the pure heat conduction, and even if the fluid is at rest, which will be due to the temperature gradient caused by the density difference between the natural convection, therefore, convection in the fluid and heat conduction occurs simultaneously. (Summary: heat conduction occurs mainly in the solid internal, two different solids, solid and liquid, between the solid gas, liquid gas between the heat transfer between them, we do not see a macroscopic movement)
2. Convection: Between the objects in the fluid (fluid is a general term for liquids and gases) as the medium, the use of fluid thermal expansion and contraction and can flow characteristics, heat transfer. Heat convection is by the flow of liquid or gas, so that the internal energy transfer from the higher part of the lower part of the process. Convection is the main way of liquid or gas heat transfer, gas convection than liquid obvious. Convection can be divided into natural convection and forced convection two. Natural convection often occurs naturally, is due to temperature non-uniform caused. Forced convection is due to the influence of the outside world on the formation of fluid mixing. Cooling fan is convection heat conduction in order to achieve cooling cooling.
3. Radiation: the use of radiation between objects and absorption of each other's electromagnetic waves, without any medium, you can achieve a temperature balance. Thermal radiation is the object does not rely on the media, directly to the energy emitted from the process to pass to other objects. Thermal radiation is the main means of long-distance transmission of energy, such as solar energy is in the form of thermal radiation, passed through the universe of space. When the object temperature is low, mainly in invisible infrared light radiation, at 500 degrees Celsius and higher temperature, then the sequential emission of visible light to ultraviolet radiation. Solar water heaters, solar cookers, microwave ovens, etc. are heat radiation.
Heat transfer through the heat conduction, convection and heat radiation in three ways to achieve. In the actual heat transfer process, these three methods are often not carried out separately.
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