Effects of modified surface on flow and heat transfer of heat pipe

A physical model of the heat pipe with an ordinary and modified surface was constructed to numerically simulate the thermal performance inside the heat pipe. In this article, water was chosen as the working fluid. Different heating power and filling ratios were considered. The results showed that the increase in the heating power and filling ratios can improve the heat exchange capacity of the heat pipe. The addition of the superhydrophilic surface can create more bubble cores, and the addition of the superhydrophobic surface can quickly condense the droplets. For the thermal resistance, compared to the thermosyphon with ordinary surface, the heat pipe with modified surface was decreased by 3.03-7.99%, and the heat transfer coefficient was increased by 2.66-17.59%. It was concluded that the addition of the modified surface can enhance the heat exchange capacity of the heat pipe.