不同倾角下通孔金属泡沫强化蓄热实验研究

To study the melting behaviors of pure paraffin and the paraffin embedded in open-cell metal foam under different inclination angles between the metal foam enclosure and ground, an experimental system enabling visualization of solid-liquid interface was built. The system was used to observe and record the evolution of phase change interface in the melting process to justify the contribution of natural convection under different inclination angles to the migration of melting front. Results demonstrated that the solid-liquid interface was found to be tilted in the inclined(θ≠0°) position. At the horizontal state (θ=0°), the interface for pure paraffin was overall horizontal but locally serrated. Different inclination angles were found to have great influence on the melting process of pure paraffin. The full melting time was reduced with the decrease of inclination angel θ. The full melting time of pure paraffin in horizontal position was decreased by 14.77%, 25% and 34.16% in comparison with 30-degree, 60-degree and 90-degree cases, respectively. This indicates that the contribution of inclination angle to the thermal storage process of paraffin embedded in metal foam can be neglected.