Thermal Effect on Deformation of Nanofluid-Encapsulated Double Emulsion Droplets Flowing in a Constricted Microchannel
Thermal Effect on Deformation of Nanofluid-Encapsulated Double Emulsion Droplets Flowing in a Constricted Microchannel
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DOI：
10.1080/01457632.2021.1943853
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发表时间：
2021-06
影响因子：
2.3
通讯作者：
Y. Ren;Yuning Huang;Caoyu Xie;Yuying Yan;Jing Wang;Tomohiko Yamaguchi
中科院分区：
文献类型：
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作者：
Y. Ren;Yuning Huang;Caoyu Xie;Yuying Yan;Jing Wang;Tomohiko Yamaguchi
摘要双乳状液被广泛用作模板，形成核/壳结构的微胶囊，以可控的方式包裹和释放感兴趣的物质，用于广泛的化学和生物应用。本文建立了模拟微毛细管结构的双乳状液流经狭窄段微通道的热效应数值模型，并用两组实验数据进行了模拟。在第一组中，水分散在被水包围的油中(W/O/W)，在第二组中，将单壁碳纳米管(SWCN)分散在体积分数为0.05%(W/O/SWCN-EG)的乙二醇水溶液中，形成复乳液。在这两组中，热效应研究扩展到其他与温度相关的物理性质，如粘度、密度和导热系数。热效应对收缩微通道内剪应力分布的影响将导致两组变形的显著差异。这项研究为理解通过复杂微结构的多相流中的热效应提供了新的见解，在这些微结构中，纳米流体在生物医学应用中得到了显着的提高。
Abstract Double emulsions have been intensively used as a template to form core/shell structured microcapsules encapsulating and releasing a substance of interest in a controllable way for wide spectrum of chemical and biological applications. Herein a numerical model was established to investigate the thermal effect on breakup dynamics of a double emulsion flowing through a microchannel with a constricted segment which mimics the structure of microcapillaries using two groups of cases. In the first group, double emulsion was formed with water dispersed in oil which is surrounded by water (W/O/W); and in the second group, double emulsion was formed with water dispersed in oil which is surrounded by nanofluids where single-wall carbon nanotubes (SWCN) was dispersed in an ethylene glycol (EG) solution with volume fraction of 0.05% (W/O/SWCN-EG). In both groups, the thermal effect study was extended to other temperature dependent physical properties such as viscosity, density, and thermal conductivity. Thermal effects on the shear stress distribution in the constricted microchannel will lead to significant difference in deformation between the two groups. The investigation provides new insights to understanding the thermal effect in multiphase flow through complex microstructures where nanofluids have found significant increase in biomedical applications.