Characteristics of gas-liquid two-phase heat transfer in a confined vapor chamber
Vapor chamber is one of the devices to satisfy the thermal management of electronics.With the development of compact electronic components,the size of the vapor chamber is limited.To investigate the heat transfer characteristics of gas-liquid two-phase in a confined vapor chamber,the visualization experimental system consisting of an evaporator plate,a condenser plate,and a square quartz glass was developed in this paper.In this paper,the effects of space height and heating power on the heat transfer characteristics of vapor chambers were investigated.The interaction regimes of boiling and condensation in chambers with different heights were revealed.The experimental results show that the bubble behavior in the vapor chamber with 50 mm height is similar to that of pool boiling,whereas there is a large difference in the vapor chamber with 10 mm height.Under the lower heating power condition,the bubble in the vapor chamber with 10 mm height grows,and contacts the condensation wall and then rebounds back.While under the higher heating power condition,it is found that a bubble film on the condensation wall is generated.Under the heating power of 65 W,the thermal resistance of the vapor chamber with 50 mm height is 3.74 times of that of the vapor chamber with 10 mm height.This result shows that the heat transfer performance of the vapor chamber with lower height is deteriorated.It is hoped that the structure of the confined vapor chamber needs to be further designed and optimized to achieve the higher demand for electronic thermal management applications.
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