The 2-Phase Lattice Boltzmann Simulation of Flow-Following Bubble Movement Through Microchannels in Orifice Plates
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摘要: 带有气泡的两相流系统存在于各种工业过程中，涉及复杂的相界面变化，但气泡在管道中伴随液相流动时，通过孔板的运动过程尚未有充分的研究结果.相场格子Boltzmann模型在模拟复杂界面方面具有优势，适合研究气泡两相流在含孔板微通道内的运动，分析We数、气泡相对大小和孔板表面润湿性等因素对气泡动力学特性的影响.数值计算结果显示，随着We数增加，气泡表面张力减小，导致其穿过孔板结构时更易被撕裂，峰值速度降低.在研究的参数范围内存在两个临界直径比，这两个临界值将气泡通过孔板的运动分成三种形态，而且临界直径比会随We数的增加而减小.另外，随着接触角的增大，孔板表面对气体的吸附能力加强，气泡与孔板表面的接触面积增加，引起穿过孔板气泡的质量减少和气泡通过的速度增加.
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关键词:
- 格子Boltzmann方法 /
- 气泡运动 /
- 孔板 /
- 两相流 /
- 润湿性
Abstract: The 2-phase flow systems with bubbles exist in various industrial processes and involve complex phase interface changes, but the bubble movement through orifice plates accompanied by liquid flow in channels has not been fully studied. The phase field lattice Boltzmann model has advantages in simulating complex interface, and is suitable for studying the movement of bubble 2-phase flow through microchannels in orifice plates, and analyzing the effects of factors such as the We number, the relative bubble size and the orifice surface wettability on the dynamic characteristics of bubbles. The numerical results show that, with the increase of the We number, the surface tension of the bubble would decrease, which makes the bubble more likely to be torn and its peak velocity decrease when it passes through the orifice structure. There are 2 critical diameter ratios in the studied parameter range, which divide the bubble movement into 3 forms through the orifice, and the critical diameter ratio decreases with the We number. In addition, with the increase of the contact angle, the adsorption capacity of gas on the surface of the orifice plate would improve, and the contact area between the bubble and the orifice plate surface would increase, which would cause the bubble mass passing through the orifice plate to decrease and the bubble speed passing through the orifice plate to increase.-
Key words:
- lattice Boltzmann method /
- bubble movement /
- orifice plate /
- 2-phase flow /
- wettability
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图 4 气泡进入孔板和离开孔板时，不同网格下的气泡轮廓
Figure 4. Snapshots of the bubble contour under different grids for the bubble entering and leaving the pore plate
图 6 d/D=0.533 33的气泡通过孔板的动态行为
Figure 6. Dynamic behaviors of the bubble with d/D=0.533 33 through the orifice plate
图 8 不同1/We和d/D下气泡通过孔板的动态行为
Figure 8. Dynamic behaviors of the bubble through the pore plate at different 1/We and d/D values
图 9 气泡运动过程中在不同d/D下几种运动参数随We数的变化
Figure 9. Changes of several motion parameters with the We number at different d/D values during bubble movement
图 10 气泡通过不同润湿性孔板动态行为
Figure 10. Dynamic behaviors of the bubble through pore plates with different wettabilities
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