Investigation on the performance of bionic wick flat heat pipes

To solve the thermal management problem of electronic equipments, according to the micro convex structure of the hydrophilic plant, three flat heat pipes: normal evaporator (No1), superhydrophilic evaporator (No2), the matched superhydrophilic evaporator and superhydrophobic condenser (No3) were constructed with conical capillary wicks, using electrolytic copper powder of the particle diameter 75μm as sintering material. Experiments were conducted to study the effect of heating power Q and tilt angle on the three flat heat pipes with deionized water as the working fluid. The results show that angle almost has no effect on the three flat heat pipes, namely, the three flat heat pipes all have good antigravity performance. The No3 flat heat pipe has the best thermal performance; when tilt angle of 0° and Q=1404W, the central point temperature of the evaporation is just 670℃. The No3 flat heat pipe has not only the smallest evaporation thermal resistance, but also the smallest condensation thermal resistance, which can reach to 005K/W, 002K/W, respectively.