Experimetal and CFD analysis of closed loop pulsating heat pipe with DI-water

In this paper the closed loop pulsating heat pipe (CLPHP) setup was prepared of 2 mm diameter and in vertical position with bottom heating mode. Experiments were conducted with Di-water as working fluid for different heat loads to assess the thermal performance and the CFD simulation also carried out to compare its experimental results. The VOF model in Star CCM+ was selected, to analyses phase change process and also the surface force model was used to consider the effect of surface tension. The flow visualization in experiment was observed. The simulation with unsteady model was successful in reproducing the two phase flow process in CLPHP, together with bubble generation in evaporator section and oscillation caused by the pressure difference. The simulation results of CLPHP with different heat input were compared with the experimental results at the same condition.