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Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids
Published on: March 5, 2014
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Hydrodynamic interaction of two deformable drops in confined shear flow
Yongping Chen1, Chengyao Wang2
1Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, People's Republic of China and School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, People's Republic of China.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 15, 2014
Summary
Two drops in fluid flow exhibit distinct behaviors: passing-over or reversing. Confinement and initial separation dictate these hydrodynamic interactions and drop morphologies.
Area of Science:
- Fluid Dynamics
- Rheology
- Multiphase Flow
Background:
- Understanding droplet interactions is crucial in various industrial processes.
- Confined shear flows present unique challenges for multiphase systems.
Purpose of the Study:
- To investigate the hydrodynamic interaction between two neutrally buoyant circular drops.
- To explore flow regimes and rheological behaviors influenced by confinement and initial separation.
Main Methods:
- Computational fluid dynamics (CFD) simulation.
- Volume-of-fluid (VOF) method for tracking interfaces.
Main Results:
- Identified two primary drop behaviors: passing-over and reversing motion.
- Behavior transition from passing-over to reversing with increased confinement.
- Initial lateral separation influences drag and promotes passing-over motion.
- Phase diagram developed to map drop morphologies against confinement and separation.
Conclusions:
- Drop interaction dynamics are governed by competing drag and entrainment forces.
- Confinement and initial separation are key parameters controlling drop behavior and morphology.
- The study provides a quantitative understanding of droplet interactions in confined shear flows.
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