Onset and performance of a two layer oscillating heat pipe in a heat spreader

Experiments were performed to characterize a two-layer oscillating heat pipe in a heat spreading plate heated locally on one side and cooled throughout the other side. The 23-turn oscillating heat pipe with 2 mm hydraulic diameter square channels and interconnected between the layers was charged with a 70 percent fluid loading of degassed DI water. The effect of heating location, operating temperature and orientation were examined. The results …