Effect of thermal resistance on thermally conductive materials

Thermal conductivity is the most commonly used parameter in our heat conduction and heat dissipation industry. It is also a synonym for expressing the quality of thermal conductive materials. Many times when we refer to "thermal resistance", we will feel a little strange to this word. Explain to everyone the meaning of thermal resistance
1. Definition of thermal resistance:
When heat passes through a certain medium by heat conduction, the resistance value that the heat encounters in this medium is called thermal resistance, and the unit is K (℃) / W. Generally speaking, the thermal conductivity of thermally conductive materials The larger, the smaller the thermal resistance value, but the contact area and thickness are also one of the factors that affect the thermal resistance. Taking the thermally conductive silica gel as an example, due to the very large thermal resistance of air, the heat source and the heat sink can be By adding a certain amount of pressure to fill the gap by adding a thermally conductive silicone sheet, the compressible performance makes the thermally conductive silicone sheet not only achieve the purpose of increasing the contact area, but also effectively reduce the heat transfer distance and the thermal resistance between the heat source and the radiator,
Second, the thermal resistance calculation formula:
The thickness of the thermal conductive material is represented by T, S is the contact area, and λ is the thermal conductivity coefficient. The thermal resistance value θ of the thermal conductive material can be obtained by substituting the value into the formula. If the thermal resistance is greater, the thermal conduction resistance of the material is also higher. The lower the heat conduction efficiency, the greater the thermal resistance between the heat source and the heat dissipation device for the heat dissipation system of electronic products. This is why the heat dissipation system must be The reason for using thermally conductive materials as the conductive boundary quality, a good thermally conductive material can minimize the thermal resistance between the heat source and the heat dissipation device, thereby greatly improving the heat dissipation efficiency.