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首页> 外文期刊>Journal of Non-Newtonian Fluid Mechanics >Generation of Newtonian droplets in Newtonian and non-Newtonian carrier flows in micro T-junctions under opposed-flow configuration
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Generation of Newtonian droplets in Newtonian and non-Newtonian carrier flows in micro T-junctions under opposed-flow configuration

机译：牛顿和非牛顿载体的牛顿液滴在相反流动配置下在微T型连接中流动

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摘要

In this paper the generation of Newtonian microdroplets in both Newtonian and non-Newtonian carrier fluids through a commercial micro T-junction under an opposed-flow configuration is analyzed experimentally. Pure deionized water and 0.2 wt% aqueous Xanthan gum solution in presence or absence of surfactant (Tween 20) have been considered as carrier fluids and the silicone oil is employed as the dispersed phase. The role of surfactant as a promoter of the generation of a droplet-based flow at the outlet of the T-junction is analyzed. Squeezing, dripping, jetting and parallel flow regimes have been generated by varying the flow rates of the dispersed and continuous phases at the inlets of the junction. A series of flow maps is presented in order to facilitate the design prediction of the droplet flow patterns generated at the outlet of the junction by varying the Capillary number and/or the inlet volumetric flow rates of Newtonian and non-Newtonian fluids. In the current paper, detailed information about the typical values of the droplet breakup distance from the center of the T-junction is demonstrated and the typical droplet length and polydispersity values are studied as a function of the inlet flow rate ratio and Capillary number.
机译：本文通过实验分析了在牛顿和非牛顿载体中产生牛顿和非牛顿载体流体的牛顿微量滴度。纯去离子水和0.2wt％的黄原胶水溶液在存在或不存在表面活性剂（吐温20）中被认为是载体流体，并且硅油用作分散相。分析了表面活性剂作为在T-结的出口处产生基于液滴流动的启动子的作用。通过改变结的分散和连续相的流速来产生挤压，滴水，喷射和并行流动制度。提出了一系列流图，以便于通过改变牛顿和/或非牛顿流体的毛细管数和/或入口体积流量来促进在结的出口处产生的液滴流动图案的设计预测。在本发明的纸张中，对距T条的中心的液滴分解距离的典型值进行了详细信息，并将典型的液滴长度和多分散性值作为入口流速比和毛细数进行研究。

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