Flow and sedimentation characteristics of silica hard-shell microcapsule slurries treated with additives
Flow and sedimentation characteristics of silica hard-shell microcapsule slurries treated with additives
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DOI：
10.1016/j.ijrefrig.2019.07.007
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发表时间：
2019-10
影响因子：
3.9
通讯作者：
Hiroshi Suzuki;R. Hidema;S. Usa;Takafumi Horie;Y. Komoda;N. Ohmura;K. Taniya;Y. Ichihashi;S. Nishiyama;H. Asano
中科院分区：
文献类型：
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作者：
Hiroshi Suzuki;R. Hidema;S. Usa;Takafumi Horie;Y. Komoda;N. Ohmura;K. Taniya;Y. Ichihashi;S. Nishiyama;H. Asano
研究了微胶囊相变材料的沉降和流动特性。作为相变材料，使用具有218 kJ kg-1潜热的三氟乙烷笼形水合物并将其封装在二氧化硅硬壳微胶囊中，其尺寸分布在15 μm和59 μm处具有两个峰。阳离子表面活性剂油基双羟乙基甲基氯化铵与抗衡离子水杨酸钠用作减阻添加剂，聚乙烯醇用作稳定剂。结果表明，复合添加剂能有效地防止微胶囊的沉降。在高雷诺数区域也观察到阻力减小。因此，本添加剂被认为是有前途的潜热传输通过使用二氧化硅硬壳微胶囊包含相变材料。
The sedimentation and flow characteristics of micro-encapsulated phase change materials have been investigated. As a phase change material, trimethylolethane clathrate hydrate having 218 kJ kg−1of latent heat was used and encapsulated in silica hard-shell microcapsules, which size distribution has two peak at 15 µm and 59 µm. A cationic surfactant, oleylbishydroxyethylmethylammonium chloride with a counter-ion, sodium salicylate was used as drag reducing additives and poly vinyl alcohol was used as a stabilizer. From the results, it was found that the combination additive prevents effectively the microcapsule sedimentation. The drag reduction was also observed to occur in the high Reynolds number region. Thus, the present additive was concluded to be promising for the latent heat transportation by use of silica hard-shell microcapsules containing phase change materials.