Design And Heat Transfer Characteristics Of The Antigravity Bidirectional Complementary Heat Pipe Component

Heat pipe has been widely used to solve heat dissapation and temperature equalization problems in electronics for its merits of small size,uniform temperature and flexible arrangement.Existing research shows that inclination has a detrmental impact on heat transfer peroperty of heat pipes,but relevant experimental data is still insufficient.This paper will revolve around copper-water sintered heat pipe and a preliminary theoretical caculation of thermal resistance and heat transfer limit was carried out,the result shows that the wick accounts for 83.7%of its total thermal resistance,0.40K/W,and the power linit is 49.1W.The steady-state test method was adopted to measure the heat transfer characteristics of copper-water sintered heat pipe under different tilt angles range from-90° to +90°.Experimental data indicates that total thermal resistance stays low value under all positive angles(from 0.40K/W to 0.43K/W),but has a 15%rise throughout the whole range of negative inclination,and the max value reaches 0.50K/W.The max difference under the same angle is up to 18%,which further demonstrates the importance of inclination effect on sintered heat pipe.To alleviate the undesired increase in thermal resistance appears at large negative angles,a novel design of antigravity bidirectional complementation is put forward and the heat pipe component using this design is tested under diverse tilt angles and heating power.The results show that max temperature difference is 1?,2?,3? and 5? respectively under 20W,30W,40W,50W of heat power,which is acceptable for baseplate;the positive inclination heat pipe works effectively to keep the total thermal resistance in an acceptable range within the whole tilt angles,and transfers more heat than the negative inclination heat pipe at steep angles.This phenomenon of complementation is has basically reached the design target.This paper examines in detail the relationship between heat transfer property and inclination angle of copper-water sintered heat pipe,and proposes a new idea of antigravity bidirectional complementary design for heat pipe,which provides abundant experimental data and reference value for future research.