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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Lattice Boltzmann models for nonideal fluids with arrested phase-separation
S Chibbaro1, G Falcucci, G Chiatti
1Department of Mechanical and Industrial Engineering, University of Tor Vergata, Rome, Italy.
Summary
Midrange repulsion in lattice Boltzmann models enables spraylike fluid configurations. Even slight repulsion significantly increases the surface-to-volume ratio, aiding in understanding fluid breakup and spray formation.
Area of Science:
- Fluid dynamics
- Computational physics
- Nonideal fluid behavior
Background:
- Lattice Boltzmann models are used to simulate fluid dynamics.
- Understanding fluid coalescence and breakup is crucial for various applications.
- Nonideal fluid properties influence macroscopic behavior.
Purpose of the Study:
- Investigate the impact of midrange repulsion in lattice Boltzmann models.
- Analyze its effect on single-component, nonideal fluid coalescence and breakup.
- Explore the formation of multidroplet configurations.
Main Methods:
- Utilized lattice Boltzmann models with midrange repulsive interactions.
- Defined a pseudopotential energy analogous to magnetic Ising systems.
- Performed simulations to observe fluid behavior and droplet formation.
Main Results:
- Midrange repulsion facilitates the creation of spraylike, multidroplet structures.
- Droplet size is directly correlated with the strength of repulsive interactions.
- A small percentage of repulsive pseudoenergy dramatically increases the surface:volume ratio (nearly two orders of magnitude).
- Pseudopotential energy acts as a quasiconserved quantity, indicating configuration stability.
Conclusions:
- Midrange repulsion is a key factor in controlling fluid fragmentation and spray formation.
- The defined pseudopotential energy provides a quantitative measure for analyzing fluid configurations.
- This approach offers a powerful tool for modeling complex phenomena like atomization and microemulsions.
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