With the development of heat pipe technology

the research on heat pipe is more and more extensive. By loading the user defined function(UDF)

the Fluent software was applied to simulate the copper-water thermosyphon

and the thermosyphon with different dip angles was also simulated. The results indicated that

the simulation results agreed well with the experimental results

and the best dip angle for the gravitational heat pipe is 57°. The wall temperature distribution affected by the laminated flow at different angles was obtained

and visualization research was also carried out for the evaporation section during working process

which well reproduced the process of phase change in the evaporation section.