中文摘要：

采用基于双流体模型开发的计算程序模拟了圆管内潜热型功能热流体在均匀热流密度条件下层流流动时的融化特性,模型中相变材料为正十六烷,壳层材料为尿素甲醛树脂,载流体为去离子水.分析了Re数、相变微胶囊颗粒体积浓度、热流密度对融化特性的影响.结果表明,当潜热型功能热流体流过被加热圆管时,存在非融化、融化和完全融化区域;随Re数增加,管道近壁处和中心处的融化起始和终止点均向出口处移动,融化区域逐渐变长;随颗粒浓度增加,管道中心处的融化起始和终止点均逐渐向出口处移动,而近壁处的融化区域起始和终止点则基本保持不变,融化区域同样得到延伸;壁面热流密度越大,近壁处和中心处融化区域起始和终止点越靠近入口位置,对应的融化区域则越短.

英文摘要：

Computational procedure based on two-fluid model was employed to study the melting characteristics of latent functionally thermal fluid in a circular tube with uniform heat flux and laminar flow, urea-formaldehyde resin and n-hexadecane were used as the shell and core materials, and deionized water as carrier fluid. The effects of Reynolds number （Re）, concentration of microencapsulated phase change material particles and heat flux on the melting characteristics were examined. The results show that the non-melting, melting and melted regions coexist when the latent functionally thermal fluid flows in heating circular tube. With increasing of Re, the melting start and end points near the wall and center of circular tube move to outlet, and the melting region increases gradually. With increasing of particles volume concentration, the melting start and end points in the center of tube move to outlet. However, the melting start and end points near the wall are almost kept constant, and the melting region also extents to outlet. The bigger the wall heat flux, the closer to inlet the melting start and end points near the wall and center of circular tube, and the shorter the melting region.