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Dissolution process of a single bubble under pressure with a large-density-ratio multicomponent multiphase lattice
Xiaolong He1,2, Jianmin Zhang1, Qian Yang2,3
1State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China.
This study introduces a stable lattice Boltzmann model to simulate bubble dissolution under pressure. The model reveals that pressure difference linearly impacts dissolution mass and gas concentration, aligning with Henry's law.
Area of Science:
- Multiphase flow dynamics
- Computational fluid dynamics
- Thermodynamics
Background:
- Bubble dissolution is crucial in various industrial and natural processes.
- Accurate simulation of multiphase flow requires robust numerical models.
- Understanding the influence of thermodynamic parameters on bubble behavior is essential.
Purpose of the Study:
- To develop and validate a stable multicomponent multiphase pseudopotential lattice Boltzmann model.
- To investigate the effect of a scaling coefficient (k) on bubble evolution and thermodynamic consistency.
- To analyze the pressure-driven dissolution process of a single bubble.
Main Methods:
- Utilized a large-density-ratio, tunable-viscosity-ratio multicomponent multiphase pseudopotential lattice Boltzmann model.
- Implemented a multi-relaxation-time collision operator and exact-difference-method external force scheme.
- Analyzed the influence of the scaling coefficient (k) in the equation of state (EOS) and intermolecule interaction strength.
Main Results:
- The scaling coefficient (k) affects surface tension and interface thickness, with width (w) proportional to 1/sqrt[k].
- Optimal range for k is determined to be between 0.6 and 1 for stability and consistency.
- Dissolution mass and concentration increase linearly with pressure difference, consistent with Henry's law.
Conclusions:
- The developed lattice Boltzmann model accurately simulates bubble dissolution under pressure.
- The scaling coefficient (k) is a critical parameter influencing surface tension, interface thickness, and thermodynamic consistency.
- Pressure is a key driver for bubble dissolution, with concentration directly proportional to gas pressure at equilibrium.
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