Numerical study of Janus droplet formation in microchannels by a lattice Boltzmann method

作者：Fu, Yuhang; Bai, Lin; Bi, Kexin; Zhao, Shufang; Jin, Yong; Cheng, Yi^*

来源：Chemical Engineering and Processing, 2017, 119: 34-43.

DOI：10.1016/j.cep.2017.05.019

• Droplet-based microfluidics
• Janus droplet
• Lattice Boltzmann method
• Multiphase flow
• Hydrodynamics

A ternary lattice Boltzmann method based on the color-gradient model was successfully established to numerically investigate the Janus droplet formation in a Y-junction microfluidic device. We first validated the model by comparing the simulation results of contact relationship of mono-dispersed droplets with the theoretical solutions, and then studied Janus droplet formation and the breakup dynamics in Y-juncfion numerically. The results showed that the Janus droplet size obeys a scaling law during the formation. The dynamic behavior of dispersed thread, including the thread tip and minimum width of thread, revealed that the breakup of the thread is a self-thinning process. The evolution of the minimum width of dispersed thread is dominated by evolution time in a power law relationship. The deep investigation of each dispersed thread indicated that the dynamic behavior of each thread is identical before the final pinch-off in the formation process.

• 出版日期2017-9
• 单位清华大学