Effect of Shear Thinning Rheological Properties on Particle Migration in Microchannels
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摘要: 该文采用“相对运动模型”对剪切稀化流体中的颗粒聚集现象进行了数值模拟，为了解剪切稀化效应在微流体中对颗粒力学特性的影响，对黏弹性流体和非黏弹性流体进行了剪切稀化的匹配.研究结果表明，剪切稀化特性可以明显改变颗粒的力学特性.在非黏弹性流体中，剪切稀化能导致颗粒的聚集位置向壁面移动，并且对颗粒的聚集速度具有激励作用；在黏弹性流体中，剪切稀化效应的发生会伴随着流体弹性的降低，从而导致颗粒由中心聚集转而向壁面聚集.另外，该文还观察到低剪切稀化且高弹性情况下颗粒惯性升力指向通道中心的现象.Abstract: A relative motion model was used to numerically simulate the phenomenon of particle aggregation in shear thinning fluids. To understand the shear thinning effects on particle mechanical properties in microfluidics, the shear thinning matching was performed with viscoelastic and non-viscoelastic fluids. The research results indicate that, shear thinning characteristics can significantly alter the mechanical properties of particles. In non-viscoelastic fluids, shear thinning can cause the aggregation position of particles to move towards the wall, and has an incentive effect on the aggregation speed of particles. In viscoelastic fluids, the occurrence of shear thinning will bring a decrease of the fluid elasticity, resulting in particle convergence from the center to the wall.
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Key words:
- viscoelastic fluid /
- particle aggregation /
- shear thinning /
- numerical simulation
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图 2 Carreau流体与Giesekus流体剪切稀化特性拟合情况
注 为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.
Figure 2. Fitting of shear thinning characteristics between the Carreau fluid and the Giesekus fluid
图 6 对应工况Carreau流体中颗粒移动速度
Figure 6. Particle movement velocities in the Carreau fluid under corresponding working conditions
图 7 对应工况Carreau流体中颗粒惯性升力分布情况
Figure 7. Distributions of particle inertia lifts in the Carreau fluid under corresponding working conditions
图 8 对应工况Carreau流体中颗粒升力分布情况
Figure 8. Distributions of particle lifts in the Carreau fluid under corresponding working conditions
图 9 Carreau流体与不同Re数下Newton流体中颗粒升力的分布情况对比
Figure 9. Comparison of particle lift distributions in the Carreau fluid and the Newtonian fluid at different Re numbers
图 10 Giesekus流体中，颗粒升力分布变化情况
Figure 10. Changes in particle lift distributions in the Giesekus fluid
图 11 改变Giesekus流体剪切稀化对颗粒弹性升力分布的影响
Figure 11. The effects of changing the shear thinning of the Giesekus fluid on the elastic lift distributions of particles
图 12 改变Giesekus流体剪切稀化对颗粒惯性升力分布的影响
Figure 12. The effects of changing the shear thinning of the Giesekus fluid on the distributions of particle inertia lifts
图 13 r+=0.1时，x=0截面的第一法向应力差系数云图及速度矢量图
Figure 13. The contours with velocity vectors of the first normal stress difference coefficient of the x=0 section at r+=0.1
图 14 r+=0.3时，x=0截面的第一法向应力差系数云图及速度矢量图
Figure 14. The contours with velocity vectors of the first normal stress difference coefficient of the x=0 section r+=0.3
图 15 r+=0.6时，x=0截面的第一法向应力差系数云图及速度矢量图
Figure 15. The contours with velocity vectors of the first normal stress difference coefficient of the x=0 section at r+=0.6
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