Theoretical analysis of flat heat pipe with graded-porosity wick design

Mini-groove flat heat pipe, due to high thermal conductivity, good temperature uniformity, simple structure and so on, is very suitable to be used to cool electronic devices with high heat flux and required temperature uniformity. In this paper, the axial flow and heat transfer mathematical model of mini grooves flat heat pipe in steady state is built to study the distributions of pressure, velocity of working fluid, wall temperature, etc. along the axial direction. As the wick structure plays an important role in the mini-groove flat heat pipe heat transfer enhancement, this paper utilizes the above model to investigate the influence of the size of the mini-grooves and wall with grooves along the axial direction on the heat transfer coefficient of mini grooves flat heat pipe. The best solution of the size of the mini grooves and wall with grooves along the axial direction is put forward.