Heat collector pipe in receiver of solar thermal power tower plants is a kernel unit to convert solar energy into thermal energy.Only the semi-circumference facing the heliostat field receives heat flux

while the other semi-circumference depart from the heliostat field is adiabatic.What's more

the heat transfer of boiling flow in the pipe with the water-vapor as the working fluid is especially complex.So the understanding of the heat transfer characteristics in it is significant and important.Through Fluent software

numerical model of the water-vapor tube under uneven heat flux boundary with semi-circumference heated and the other semi-circumference adiabatic was established.The three-dimensional and unsteady water-vapor twophase flow was numerically simulated.So

flow characteristics of the two-phase flow were obtained

and temperature distribution and heat transfer characteristics of the tube under uneven heat flux were revealed.