中文摘要：

针对水平圆管内自由固体相变材料储能时的吸热熔化,运用接触熔化理论建立定热流圆管热源接触熔化模型.运用Nusselt液膜理论,建立熔化控制方程,并求解得到无量纲熔化方程组.分析讨论不同工况下熔化速度、液膜层厚度和压力分布等熔化参数的变化规律,探讨各影响因素对熔化的影响,并与温差熔化结果进行比较,研究第二类热边界条件下的接触熔化规律.发现,熔化过程中随着固体高度的减小,接触熔化液膜厚度逐渐增大,使熔化速度降低;热流密度较小时,其变化对熔化影响显著.

英文摘要：

Melting of unfixed solid phase change material（PCM） inside a cylindrical tube was investigated.An analysis model of contact melting inside a cylinder tube with constant heat flux was established.Control equations of melting were established with Nusselt＇s liquid film theory,and dimensionless melting equations were obtained theoretically.Melting velocity,thickness and pressure distribution of molten layer were discussed,and they were compared with melting under Dirichlet condition to study melting law with Neumann condition.It was found that molten film thickness increases as height of solid decreases,and melting velocity decreases during melting process.Heat flux has great effect on melting while heat flux is low.