Study On Efficient Heat Transfer In The Micro-channels Based On Liquid Metal

Liquid metal technology has opened up a new development direction in the field of heat dissipation, and it is common in the form of liquid metal as heat conduction medium, but there is a lack of research on liquid metal used in micro-channel.In this paper, the finite element software ANSYS is used to realize the simulation calculation,and the heat transfer effect of liquid metal gallium and conventional cooling liquid is compared with rectangular micro-channel as carrier. The main research results of this paper are as follows:1. Based on rectangular micro-channel, a 3D model is established and divided by the finite element mesh.With the liquid metal gallium and the traditional cooling liquid used as the working fluid in the FLUENT numerical simulation, the effect of heat transfer is studied. Results show that the cooling system has the disadvantage of weak uniform temperature and high pressure drop between import and export.2. Under the guidance of the heat transfer and fluid mechanics, uniform temperature micro-channel and step-down micro-channel were designed in view of the above advantage. 4U micro-channel can effectively improve the heating surface temperature and both Y-shape micro-channel and amplifying micro-channel can decrease the import and export pressure drop.3. Combining the advantages of uniform temperature micro-channel and step-down micro-channel,we design T-Y-junction micro-channels. Analysis results show that T-Y-junction micro-channels have better uniform temperature and lower pressure.Moreover,the parameter study of direction and flow mass is performed for three type micro-channels.4. To verify the reliability of the simulation results, We set up the experimental platform based on rectangular micro-channel. By comparing the experimental data and simulation data, the conclusion is drawn that the simulation results are more accurate, meanwhile,thermal contact resistance should also be considered.