Research On Heat Transfer Mechanism And Optimization Of Experiment Process Of Nanoparticles Containing Phase Change Composite

With the development of space technology, the power and heat flux of the spacecraft are constantly increasing. In order to keep the temperature constant in the instrument cabin, it is required to absorb the accumulated heat quickly and effectively. The phase change material has a high latent heat value, which can absorb heat flux in the condition of constant temperature. However, the thermal conductivity of the phase change material is low. In order to improve the thermal response of the phase change materials, high porosity, high thermal conductivity and high thermal conductivity are used to improve the thermal conductivity of the matrix. Three kinds of high thermal conductive nano particles (AlN, carbon nanotubes,Shi Moxi) were used to modify the phase change materials. The thermal conductivity of the composite materials can be enhanced by nano materials, and the thermal cycling stability of composite materials is enhanced.In this paper, the preparation of composite phase change energy storage material is analyzed, and the nano particles are well dispersed in the phase change material, and the modified phase change material is filled with the vacuum infiltration method. After the completion of the composite phase change energy storage material, the thermal conductivity of carbon foam was measured, and the optimization of the process of the phase change materials was made. These methods improve the overall thermal performance of composite energy storage materials.In this paper,the heat transfer of phase change materials in micro scale was simulated by molecular dynamics simulation,The strengthening heat transfer mechanism of the modified phase change material with the addition of nano particles was explored. Finally, the thermal conductivity of composite phase change materials were measured. The results showed that the modified phase change materials were satisfied. The composite phase change materials have excellent thermal and thermal storage capacity. The improved composite phase change energy storage materials can reduce the fluctuation of heat flux and heat conduction.