储能科学与技术2024，Vol.13Issue(2)：425-435,11.DOI:10.19799/j.cnki.2095-4239.2023.0652
金属蜂窝/石蜡复合相变材料融化储热性能研究
Melting heat storage properties of metal honeycomb/paraffin composite phase change materials
摘要
Abstract
To elucidate the competitive correlation between metal honeycomb heat conduction and natural convection heat transfer in the liquid phase during the melting heat storage process of metal honeycomb/paraffin composite phase change material(PCM),a computational model based on the fluid-solid-thermal coupling theory was established.The phase change paraffin melting test was conducted to verify the effectiveness of the proposed computational model.Furthermore,the enhancement effect of metal honeycomb heat conduction and natural convection heat transfer in the liquid phase were analyzed,along with their competitive correlation.The results show that the heat storage process of phase change paraffin melting in a square cavity under bottom heating can be divided into four stages:heat conduction,steady growth,transition,and turbulence.The proportions of each stage in the total melting time are 0.8%,2.3%,13.6%,and 83.3%,respectively.Barrier-free heat transfer is realized with the natural flow of liquid paraffin,improving the thermal storage efficiency of phase change paraffin.The enhancement effect of natural convection heat transfer is considerably weakened with the decrease in size and becomes negligible when the size is less than 2 mm.Increasing the thermal conductivity and heat transfer area of the metal honeycomb can improve the thermal storage efficiency of phase change paraffin.After embedding the metal honeycomb,a multilayer melting phenomenon occurs in the PCM heat storage process,creating a temperature gradient in the melting zone.Compared with the heat storage efficiency of pure paraffin,the effect of the metal honeycomb is first enhanced and then inhibited.When the melting fraction exceeds the critical value 0.77,the metal honeycomb enters the inhibition stage.关键词
蜂窝金属/相变材料/热传导/自然对流/竞争关系Key words
honeycomb metal/phase change materials/high heat conduction/natural convection/competitive relationship分类
能源科技引用本文复制引用
倪鹏,曹世豪..金属蜂窝/石蜡复合相变材料融化储热性能研究[J].储能科学与技术,2024,13(2):425-435,11.基金项目
国家自然科学基金项目(51908197) （51908197）
河南省科技攻关项目(202102310262). （202102310262）
