Tong chi for your interpretation of low noise dc fan heat transfer way
Low noise dc fan air pressure and air volume are two relative concepts. In general, dc cooling fan under the manufacturer's cost considerations, to design the fan air volume is big, have to sacrifice some wind pressure. If the fan can bring a lot of air flow, but the wind pressure is small, the wind is less than the bottom of the radiator ( That is why some fan speed is high, volume is very big, but it is the reason why cooling effect is not good) , on the contrary, wind pressure is often means that the air volume is small, there is not enough air and heat sink for heat exchange, also causes the cooling effect is not good. Tong chi low noise dc fans welcome you choose and buy!
any type of radiator is inseparable from the following three kinds of basic heat transfer way, just different emphasis.
1。 Heat conduction, convection and radiation. Substance itself or when in contact with the material, the energy transfer is called a heat conduction, this is one of the most common way of heat transfer. For example, CPU heat sink base take direct contact with the CPU heat is heat conduction.
2。 Heat convection: refers to the flow of fluid ( Gas or liquid) Will go tropical way of heat transfer, more common in the case of the cooling system is a cooling fan drive gas flow 'forced heat convection cooling way.
3。 Thermal radiation: refers to rely on the radiation heat transfer, everyday is the most common solar radiation. The three thermal radiation are not isolated, in daily heat transfer, the three thermal radiation is happening at the same time, work together.
such as common CPU cooling fan, CPU heat sink, direct contact with the surface of the CPU heat through heat conduction on the surface of the CPU is passed to the CPU heat sink; Dc cooling fan CPU radiator air flow through the heat convection is generated on the surface of the heat away; And the flow of the air inside the case is CPU heat sink of the surrounding air by convection heat away, until the case outside; At the same time all around the part of high temperature on low temperature part of the thermal radiation.
the radiator of the heat radiator thermal conductivity of materials, materials and the heat capacity of heat medium radiator and radiator area of effective heat dissipation and so on related parameters.
dc cooling fan inherent defect is what?
with axial flow fan is the most widely form ( The kind of fan is the most common) Drum wind down, was so popular because good comprehensive effect and low cost. If the direction of the axial flow fan, in turn, becomes upward convulsions, in some special types of radiator will use this form. Two kinds of air distribution in the form of the difference lies in the form of air blast is turbulent flow, when the wind pressure big but susceptible to resistance losses; Convulsions is laminar flow, when the wind pressure small but stable airflow. In theory, the turbulence of the cooling efficiency is much bigger than laminar flow, thus become the mainstream design form. Axial flow fan, although widely used, but also has inherent defects. Axial flow fan is block by motor position, air could not flow smooth blast area of central, which is referred to as a 'dead zone'.
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