化工学报 ›› 2020, Vol. 71 ›› Issue (4): 1491-1501.doi: 10.11949/0438-1157.20190964
Xinghui WU1(),Zhen YANG1,Ying CHEN2,Yuanyuan DUAN1(
)
摘要:
相变材料微胶囊悬浮液是将相变微胶囊颗粒添加至单相流体中形成的一种新型传热介质,由于传热系数高、传热储能一体化等优势,具备很大的发展潜力。采用离散相两相流模型,对恒热流水平圆管中相变微胶囊流体的传热特性进行了模拟计算,通过对比实验数据验证了模型的可靠性,进而定量分析了颗粒尺寸、质量分数、相变潜热,特别是颗粒分布对传热的影响。结果表明随着微胶囊颗粒质量分数增加,颗粒粒径减小,相变潜热增大,壁面传热效果越好,且相变潜热大小对壁温控制和壁面传热的影响大于颗粒质量分数和颗粒尺寸的影响。比较了离散相模型与常用的单相流模型的计算结果,发现质量分数越高,颗粒集聚程度越高,单相流模型计算的偏差越大。
中图分类号:
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