Abstract:The melting process of a phase change materials (PCM) under the Earth gravity and hypergravity was studied through numerical simulation method, and the influence of hypergravity on the melting process of PCM was analyzed. The hypergravity value is five and ten times of the Earth gravity, and the hypergravity direction is opposite to that of the incoming heat flux. The simulation results indicate that the overheating occurs on the heating wall at the beginning of the melting process, due to the small thermal conductivity of the PCM, and other heat transfer enhancement methods should be employed to weaken even eliminate the overheating. The influence of the hypergravity on melting process of the PCM is significant. The fluctuation amplitude of phase interface increases, the melting rate increases, and the temperature of the heating wall decreases with the increasing hypergravity, because of the obvious enhancement of the natural convection of the liquid PCM in the melting process. In addition, the enhancement amplitude of the hypergravity on the melting process decreases with the increasing hypergravity, implying that the enhancement of the hypergravity has a limitation, and would weaken when the hypergravity exceeds certain values.