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Modeling of Newtonian droplet formation in power-law non-Newtonian fluids in a flow-focusing device

机译：牛顿非牛顿流体中牛顿液滴形成的建模

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摘要

Droplet formation in a flow-focusing device was modeled using the open source CFD package, OpenFOAM, with the VOF model for two-phase flow. Predictions using the interFoam solver and a power-law non-Newtonian model were first validated against experimental data in the literature. Then, the formation of Newtonian fluid droplets in power-law fluids was modeled during tubing, squeezing, dripping and jetting. The effects of the continuous phase rheological parameters on the droplet formation were investigated by changing the power law index (n) and the consistency coefficient (K). The results show that the droplet length and the spacing between two droplets decrease as n or K increase. However, the formation frequency and droplet velocity in the main channel increase as n or K increase. The results also show that n has a greater effect than K on the droplet formation. A method was developed to calculate the capillary number of the power-law continuous phase in the squeezing and dripping regimes including the influences of n and K. For a given dispersed phase flow rate, the formation frequency is inversely proportional to the droplet volume. A scaling law was also developed to predict the formation frequency since the droplet volume is found to vary linearly with the non-dimensional droplet length. The present work is useful for controlling droplet formation and designing microfluidic devices in areas where non-Newtonian fluids are used as the continuous phase.
机译：使用开源CFD封装，OpenFoam，具有两相流的VOF模型，模拟流动聚焦装置中的液滴形成。使用Interfoam Solver和Power-Law非牛顿模型的预测是针对文献中的实验数据验证的。然后，在管道，挤压，滴水和喷射期间建模牛顿流体中的牛顿流体液滴的形成。通过改变电力法指数（N）和稠度系数（K）来研究连续相流变参数对液滴形成的影响。结果表明，随着n或k增加，液滴长度和两个液滴之间的间距降低。然而，主要通道中的形成频率和液滴速度随着n或k增加而增加。结果还表明，N在液滴形成上的效果更大。开发了一种方法以计算挤压和滴水制度中的动力法连续相的毛细管数，包括N和K的影响。对于给定的分散相流速，形成频率与液滴体积成反比。还开发了一种缩放法来预测形成频率，因为发现液滴体积与非尺寸液滴长度线性变化。本作本作可用于控制非牛顿流体用作连续相的区域的液滴形成和设计微流体装置。

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  • 来源
    《Heat and mass transfer》 |2020年第9期|2711-2723|共13页
  • 作者

    Qi Chen; Jingkun Li; Yu Song; David M Christopher; Xuefang Li;

  • 作者单位

    Institute of Thermal Science and Technology Shandong University 17923 Jingshi Road Jinan 250061 China;

    Institute of Thermal Science and Technology Shandong University 17923 Jingshi Road Jinan 250061 China;

    Department of Energy and Power Engineering Tsinghua University 30 Shuangqing Road Beijing 100084 China;

    Department of Energy and Power Engineering Tsinghua University 30 Shuangqing Road Beijing 100084 China;

    Institute of Thermal Science and Technology Shandong University 17923 Jingshi Road Jinan 250061 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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