Heat Pipe And Vapor Chamber（VC）

Maximum heat transfer Qmax: The value of Qmax is equal to the amount of heat generated in the following scenario: The evaporation section of the heat pipe or VC fits the heating source with the amount of heat Q, and the measured temperature difference between the evaporation section and the condensation section is within the specified range Inside (5 ℃ is usually used as a judgment standard in engineering, and 2 ℃ is used for some strict standards). The unit is W.

1.Thermal resistance R: When the heat of size Q is transferred, the actual measured temperature difference between the evaporation section and the condensation section is ΔT, and the value of the thermal resistance is ΔT / Q, and the unit is ℃ / W or K / W.

2.Start-up temperature T0: What is carried out in the heat pipe is an evaporation condensation process. However, the evaporation and condensation of fluids must occur under certain temperature and pressure conditions. Start-up temperature T0 refers to the minimum temperature required to form a phase-change thermal cycle in a heat pipe or VC.

3.The three key indicators of the heat pipe are mainly related to pipe diameter, wick permeability and porosity, wick thickness, working fluid properties, liquid filling capacity, internal vacuum, tube wall thickness, bending angle and working environment. Factors. When the heat pipe is flattened or bent, the internal steam flow space is reduced, and the capillary structure of the liquid flow is also damaged to varying degrees, so its heat transfer performance will be attenuated. Similarly, the thinner the VC, the above three performance indicators will also decrease.