The flat micro heat pipe

a new type of heat transfer devices of gas-liquid two-phase flow

has more advantages in the application of thermal control system with compact devices in the limited space

but its performance still has great room to improve. On the basis of analyzing the working medium transport characteristics of flat micro heat pipe with steam chamber

the micro heat pipe with a dimension of 45mm×16mm×1.75mm is designed and fabricated. The depth of the steam chamber is 200μm. A micro heat pip in the same size without steam chamber is fabricated to compare the heat transfer performance. Experimental results show that when the temperature difference between simulation and experiment is around 10%

the images collected by high speed image acquisition system can be well in accordance with the simulation results. When the input power is 6W

the balance temperature of heat pipe with steam chamber is 70.4℃ while the heat pipe without steam chamber is 118℃ . Meanwhile

the equivalent temperature with steam chamber under the input power from 1W to 6W is lower than without steam chamber. Hence

the stream chamber has a great influence on reducing the gaseous medium circulation resistance and improving the ability of heat production. The research work of this paper can provide reference for optimization design of flat micro heat pipe.