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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.
The calculation program based on the two-fluid model was used to simulate the melting behavior of the latent heat functional fluid in a circular tube under laminar flow with uniform heat flux. The phase change material in the model was n-hexadecane, the shell material was urea formaldehyde resin, The carrier fluid is deionized water.The influence of Re number, the volume concentration of phase change microcapsule particles and the heat flux density on the melting characteristics was analyzed.The results showed that when the latent heat functional fluid flowed through the heated pipe, there existed non-melting and melting And completely melted region. As the Re number increases, the melting start and end points near the wall and at the center of the pipeline all move towards the exit, and the melting region gradually becomes longer. As the particle concentration increases, the melting start and end at the center of the pipeline Point gradually move toward the exit and the initial and final melting zone near the wall remain unchanged and the melting zone also extends. The larger the wall heat flux density, the start and the end of the melting zone near the wall and the center The closer the point is to the entrance, the shorter the corresponding thawing area.