Lattice Boltzmann simulation of the rising process of double bubbles in a microchannel with orifice plates

YAN Yu; LOU Qin

doi:10.7638/kqdlxxb-2021.0354

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Lattice Boltzmann simulation of the rising process of double bubbles in a microchannel with orifice plates

更新时间：2026-05-28

- Lattice Boltzmann simulation of the rising process of double bubbles in a microchannel with orifice plates
- Vol. 40, Issue 3, Pages: 120-129(2022)
- 作者机构：
  
  1. 上海理工大学能源与动力工程学院,上海,200093
  2. 上海市动力工程多相流动与传热重点实验室,上海,200093
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2021.0354
  CLC： O359
- Published：2022
- 稿件说明：
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严裕, 娄钦. 大密度比双气泡在孔板结构微通道内上升行为的格子Boltzmann方法模拟[J]. 空气动力学学报, 2022, 40(3): 120−129.

YAN Yu, LOU Qin. Lattice Boltzmann simulation of the rising process of double bubbles in a microchannel with orifice plates[J]. 2022, 40(3): 120-129.
严裕, 娄钦. 大密度比双气泡在孔板结构微通道内上升行为的格子Boltzmann方法模拟[J]. 空气动力学学报, 2022, 40(3): 120−129. DOI： 10.7638/kqdlxxb-2021.0354

YAN Yu, LOU Qin. Lattice Boltzmann simulation of the rising process of double bubbles in a microchannel with orifice plates[J]. 2022, 40(3): 120-129. DOI： 10.7638/kqdlxxb-2021.0354.

摘要

基于格子Boltzmann两相流大密度比模型模拟了孔板结构微通道内双气泡在浮力作用下的上升过程，主要研究

Eötvös

数（

）、气泡相对大小、气泡之间的距离以及气泡和孔板间的距离对气泡变形、合并的动力学行为以及气泡上升速度和气泡剩余质量的运动特性的影响。研究发现，随着

数的增大，气泡在通过孔板通道时形变越严重，表现为上部气泡和下部气泡在合并过程中所夹带的液泡数量和质量同时增加，且气泡在通过通道的过程中会发生多次接触、合并与破裂；数值结果还表明，随着

数的增大，气泡达到顶端的时间增加而气泡穿过孔板的质量减小。另一方面，当上方气泡的尺寸大于下方气泡的尺寸时，两气泡在合并的过程中夹带的液泡数量更少，气泡穿过孔板时更迟缓但能够穿过孔板的气泡质量增多。此外，对于不同的气泡间距离和不同的气泡与孔板之间的距离，发现上下气泡之间的距离过大或者过小时，在气泡的合并过程中都不容易夹带液泡，且气泡穿过孔板的质量随着两气泡之间距离以及上方气泡与孔板之间距离的减小而增加。

Abstract

Based on the lattice Boltzmann two-phase large-density-ratio model

the rising process of double bubbles in a microchannel with orifice plates under the buoyancy force is simulated. The effects of the Eötvös number

relative size of bubbles

distance between bubbles

and distance between the top bubble and the orifice plate on the dynamics of bubble regrading the deformation and merge

as well as on the kinematics such as the rising velocity and the remaining bubble mass are systematically studied. It is found that as the Eövös number increases

the bubble deforms increasingly obvious when passing through the orifice. Moreover

the number and mass of bubbles entrained between the two bubbles also increase and the bubbles will contact

merge

and break several times during passing through the channel. The results also show that the time for bubbles to reach the top of the channel increases but the mass of bubbles passing through the orifice decreases as the Eötvös number increases. On the other hand

when the size of the upper bubble is larger than that of the lower bubble

there will be less entrained bubbles. As a result

the bubbles are slower to pass the channel but the mass of bubbles that can pass through the orifice plate increases. In addition

it is found that the entrainment of bubbles is not obvious if the distance between upper and lower bubbles is too large or too small

and the mass of bubbles passing through the orifice plate increases with the decrease of the distance between two bubbles and the distance between the upper bubble and the orifice plate.

关键词

Keywords

references

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