Research On The Flow And Heat Transfer Performance Of A Fractal Wick Structure Based On The Y-shaped Unit

With the rapid development of the photoelectric field, the electronic devices and related equipment present a development trend of high degree of integration, miniaturization, and lightweight, which puts forward higher requirements on the heat dissipation capability of the traditional cooling products. Therefore, further improving the design of the wick structure on the base of traditional structure design and the actual situation will greatly enhance the performance of heat pipes.Based on the current state of the traditional cooling products, the concept of wick-board-integrated structure was put forward in this paper. Inspired by the fractal networks of planet veins, a fractal wick structure based on the Y-shaped unit was designed based on the summaries of related engineering application on fractal theory. The fractal law was given, and experimental samples were manufactured by chemical etching method with a detailed manufacturing process.The physical process of the capillary flow in the main veins of the new wick structure was theoretically analyzed. The Young-Laplace equation and Navier-Stokes equations were used to establish the analytical relationship between the capillary time and the structure parameters. Compared with the related research results, the analysis method was proved to be correct. By using numerical simulation method, the influence on the working-fluid affected by the macro fractal network structure was carefully studied, and the effect law exerted by fractal series and fractal angle on the fluid flow was gained.Theoretical research work was done on the heat transfer of the new wick structure when used as the evaporator in detail, which was on the basis of related theories in thin film evaporation heat transfer. The thermal resistance network model was established for the new wick structure used as evaporator, and the analytic relationship between the evaporator thermal resistance and the wick geometry, the filling rate, the heat flux, the superheat and the other physical parameters.The experimental method was used to simulate the working environment of the new wick structure, when was used as evaporation end on the basis of theoretical results. By extracting and making comparisons to the corresponding target data with different groups of external variables, the theoretical results were well verified and supplemented.