不同加热方式下热管接收器传热性能研究

STUDY ON HEAT TRANSFER PERFORMANCE OF HEAT PIPE RECEIVER BASED ON DIFFERENT HEATING MODES

为研究不同加热方式下热管的传热性能,该文设计并搭建一套具有非均匀加热功能的热管传热性能实验测试台架。实验测试加热方式(均匀加热、上表面加热、下表面加热)、加热功率和放置倾角对热管传热性能的影响。实验结果表明:加热功率和放置倾角一定,均匀加热时热管热效率最大,下表面加热时次之,上表面加热时最小;下表面加热时,热管总传热热阻最小,蒸发段传热系数最大,外壁面平均温度最低。无论采用哪种加热方式,随着放置倾角的增大,热管热效率均逐渐减小,总传热热阻逐渐增大,蒸发段传热系数逐渐减小;蒸发段液池区域外壁面温度均明显高于液膜区域;液膜区域,沿高度方向外壁面温度变化较小。

In order to study the influence of different heating modes on heat pipe heat transfer performance,this paper designed and built a set of two-phase closed thermosyphon(TPCT)heat pipe heat transfer performance experimental test bench with non-uniform heating function.The experiment tested the influence of the heating method(Uniform heating,Upper surface heating,Lower surface heating),heating power and placement angle on TPCT heat pipe heat transfer performance.The experimental results show that under certain conditions of heating power and placement angle,TPCT heat pipe has the largest thermal efficiency when uniformly heated,followed by lower surface heating.TPCT heat pipe has the lowest thermal efficiency when the upper surface is heated.Compared with other heating modes,when the lower surface is heated,the total heat transfer resistance of the heat pipe is the smallest,the heat transfer coefficient of the evaporation section is the largest,and the average temperature of the outer wall is the lowest.When the upper surface is heated and uniformly heated,there is little difference in the temperature of the outer wall.No matter which heating method is used,with the increase of placement angle,the thermal efficiency of heat pipe decreases gradually,the total heat transfer resistance increases gradually,and the heat transfer coefficient of evaporator decreases gradually.The outer wall temperature of the liquid pool area in the evaporator is significantly higher than that in the liquid film area.In the liquid film area,the temperature of the outer wall surface changes little along the height direction.