Bubble formation in lattice Boltzmann immiscible shear flow.
Bubble formation in lattice Boltzmann immiscible shear flow.
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DOI：
10.1063/1.2711433
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发表时间：
2007-03
期刊：
影响因子：
--
通讯作者：
R. Qin
中科院分区：
文献类型：
--
作者：
R. Qin
采用格子Boltzmann细观模拟方法研究了货车德瓦耳斯流体中气泡的形成以及剪切对气泡形成的影响。在没有剪切的情况下，形成的气泡的最大数量增加与过冷度，但气泡形成前的孵化时间显着减少。结果与经典相变理论一致。在剪切流中，气泡的最大数量不受剪切的影响，但气泡的生长速度加快。剪切对汽泡生长速率的影响在大过冷度时减弱。原因有两方面。一方面，深过冷系统由于驱动力大，完成相变所需的时间短，因而积累流动效应的时间短;另一方面，在大过冷度下，气泡长大机制由粗化转变为聚并。
Bubble formation and the effect of shear on bubble formation in a van der Waals fluid is investigated by means of lattice Boltzmann mesoscale simulations. In the absence of shear, the maximum number of formed bubbles increases with undercooling but the incubation time before bubble formation decreases dramatically. The results are in agreement with classical phase transition theory. In shear flow, the maximum number of bubbles is not affected by shear but the bubble growth rate is accelerated. The effect of shear on bubble growth rate weakens at large undercoolings. The reasons are twofold. On the one hand the highly undercooled system takes less time to complete phase transition due to the large driving force so that there is less time to accumulate the flow effect. On the other hand the mechanism for bubble growth changes from coarsening to coalescence at large undercoolings.