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2019 Volume 27 Issue 2
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Chao Wang, Chao-qun Shen, Su-chen Wu, Xiang-dong Liu, Fang-ping Tang. 2019: Hydrodynamic binary coalescence of droplets under air flow in a hydrophobic microchannel, Chinese Physics B, 28(2): 327-336. doi: 10.1088/1674-1056/28/2/024702
Citation: Chao Wang, Chao-qun Shen, Su-chen Wu, Xiang-dong Liu, Fang-ping Tang. 2019: Hydrodynamic binary coalescence of droplets under air flow in a hydrophobic microchannel, Chinese Physics B, 28(2): 327-336. doi: 10.1088/1674-1056/28/2/024702
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Hydrodynamic binary coalescence of droplets under air flow in a hydrophobic microchannel

  • School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China

  • Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

  • Fund Project: the National Natural Science Foundation of China(Grant . 51876184, 51706193, and 51776037)%the National Natural Science Foundation of China–NSAF(Grant U1530260)%the China Postdoctoral Science Foundation(Grant 2017M621835)%the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(Grant 17KJB470014)%Jiangsu Planned Projects for Postdoctoral Research Funds, China(Grant 1701188B)
  • Based on the volume of fluid (VOF) method, we conduct a numerical simulation to study the hydrodynamic binary coalescence of droplets under air flow in a hydrophobic rectangular microchannel. Two distinct regimes, coalescence followed by sliding motion and that followed by detaching motion, are identified and discussed. Additionally, the detailed hydrodynamic information behind the binary coalescence is provided, based on which a dynamic mechanical analysis is conducted to reveal the hydrodynamic mechanisms underlying these two regimes. The simulation results indicate that the sliding motion of droplets is driven by the drag force and restrained by the adhesion force induced by the interfacial tension along the main flow direction. The detachment (i.e., upward motion) of the droplet is driven by the lift force associated with an aerodynamic lifting pressure difference imposed on the coalescent droplet, and also restrained by the adhesion force perpendicular to the main flow direction. Especially, the lift force is mainly induced by an aerodynamic lifting pressure difference imposed on the coalescent droplet. Two typical regimes can be quantitatively recognized by a regime diagram depending on Re andWe. The higher Re andWe respectively lead to relatively larger lift forces and smaller adhesion forces acting on the droplet, both of which are helpful to detachment of the coalesced droplet.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Hydrodynamic binary coalescence of droplets under air flow in a hydrophobic microchannel

Abstract: Based on the volume of fluid (VOF) method, we conduct a numerical simulation to study the hydrodynamic binary coalescence of droplets under air flow in a hydrophobic rectangular microchannel. Two distinct regimes, coalescence followed by sliding motion and that followed by detaching motion, are identified and discussed. Additionally, the detailed hydrodynamic information behind the binary coalescence is provided, based on which a dynamic mechanical analysis is conducted to reveal the hydrodynamic mechanisms underlying these two regimes. The simulation results indicate that the sliding motion of droplets is driven by the drag force and restrained by the adhesion force induced by the interfacial tension along the main flow direction. The detachment (i.e., upward motion) of the droplet is driven by the lift force associated with an aerodynamic lifting pressure difference imposed on the coalescent droplet, and also restrained by the adhesion force perpendicular to the main flow direction. Especially, the lift force is mainly induced by an aerodynamic lifting pressure difference imposed on the coalescent droplet. Two typical regimes can be quantitatively recognized by a regime diagram depending on Re andWe. The higher Re andWe respectively lead to relatively larger lift forces and smaller adhesion forces acting on the droplet, both of which are helpful to detachment of the coalesced droplet.

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