Effect of graphene nanofluids contact angle on the visualization and metal pulsating heat pipe

This study measured the advancing contact angle and receding contact angle of the graphene nanofluids, and analyzed the difference between the pulsating heat pipe (PHP) of different materials to the contact angle. We were found the optimal graphene nanofluids parameters by the glass visualization PHP, and using this parameter to the metal PHP. We can calculate the flow resistance of the fluid and the thermal resistance of the metal PHP by the contact angle. And experiments using metal and glass PHPs were used to verify the theoretical analysis. The thermal resistance of the graphene nanofluids on the metal PHP was better than 30% of the pure water.