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Based on the lattice Boltzmann method, this paper conducts a three-dimensional numerical simulation of the motion behavior of bubbles in complex porous media channels in a large density ratio gas-liquid system. The Eötvös number (Eo), contact angle (θ) and Reynolds number (Re) are systematically discussed. The influence on bubble dynamics reveals the coupling effect of the three in bubble velocity, morphological evolution and stagnation phenomenon. The study found that the results showed that an increase in the contact angle would reduce the bubble velocity and intensify the velocity fluctuations, making the bubbles tend to flatten, while an increase in the Eo number significantly suppressed the influence of the contact angle, stabilized the bubble velocity, and made its shape close to that of a bullet. Head shape. When the contact angle is large (θ>90°) and the Eo number is small (Eo<10), the adhesion force is significantly enhanced and the bubbles will stagnate inside the porous medium. Re number and contact angle are in a competitive relationship in the generation of resistance, and have mutually reinforcing effects on the average velocity of bubbles and interface evolution. The larger contact angle makes the deformation of the bubble tail intensify and becomes unstable, and as the Re number further increases, the tail tentacles are more likely to break, forming residual bubbles. The article also found that the coupling between Eo number and Re number significantly affects bubble motion behavior and morphological evolution. Under the conditions of high Eo number (Eo≥25) and high Re number (Re≥14), the bubble velocity increases with the increase of Eo number. rises, and the trend becomes more significant as the Re number increases; while under the conditions of low Eo number (Eo<25) and low Re number (Re<14), the speed change pattern is completely opposite. This phenomenon is due to the high instability of bubble morphology under high Eo number and high Re number conditions, which affects the buoyancy and speed performance. The research results provide important guidance for optimizing the flow behavior of bubbles in porous media.
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Keywords:
- Lattice Boltzmann Method /
- gas-liquid two-phase flow /
- porous media /
- three-dimensional numerical simulation
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