Experiments were performed to investigate the heat transfer characteristics of coupled pulsating heat pipe and single pulsating heat pipe

with the main pulsating heat pipe filled with the same substance and a constant temperature water bath as heat source.The heat transfer characteristics and the wall temperature of the coupled pulsating heat pipe were analyzed and compared with the single pulsating heat pipe under the same conditions.The results showed that with the same heat source and cooling source temperature

the heat absorption and heat output of the coupled pulsating heat pipe were greater than those of the single heat pipe

and the heat transfer was also better in the case of small temperature difference.〖JP2〗For the same water bath temperature

the oscillation amplitude of the wall temperature in the condenser section of the coupled pulsating heat pipe was significantly lower than that of the single heat pipe

while the oscillation frequency increased significantly.The coupled pulsating heat pipe improves the alternating phase transition between the liquid column evaporation and the steam plug condensation inside the main pulsating heat pipe

thus reinforcing the heat transfer between the gasliquid medium and the wall.