The temperature field and the velocity field of the water heat pipe are numerically simulated in order to analyze the temperature uniformity in the thermometer well. The mathematical models of three coupled heat transfer areas

which include the pipe wall

the wick

the liquid water in the cavity and the vapor

are established. By using VOF model

the heat and mass transfer process of fluid flow and heat transfer in the water heat pipe were simulated to obtain the temperature distribution and velocity distribution under steady state. The effects of the heating temperature

the length of the heating section

and the filling volume on the temperature field in the water heat pipe are analyzed. Moreover

the comparison result indicates that there is a good agreement between the numerical simulation results and the experimental results. The results of this paper can provide theoretical basis and guidance for water heat pipe design

operation and improvement.