Spreading and engulfment of a viscoelastic film onto a Newtonian droplet

IF 2.5 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS Physical Review Fluids Pub Date : 2024-09-12 DOI:10.1103/physrevfluids.9.094003
Chunheng Zhao, Taehun Lee, Andreas Carlson
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Abstract

We use the conservative phase-field lattice Boltzmann method to investigate the dynamics when a Newtonian droplet comes in contact with an immiscible viscoelastic liquid film. The dynamics of the three liquid phases are explored through numerical simulations, with a focus on illustrating the contact line dynamics and the viscoelastic effects described by the Oldroyd-B model. The droplet dynamics are contrasted with the case of a Newtonian fluid film. The simulations demonstrate that when the film is viscoelastic, the droplet dynamics become insensitive to the film thickness when the polymer viscosity and relaxation time are large. A viscoelastic ridge forms at the moving contact line, which evolves with a power-law dependence on time. By rescaling the interface profile of the ridge using its height and width, it appears to collapse onto a similar shape. Our findings reveal a strong correlation between the viscoelastic stress and the interface shape near the contact line.

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粘弹性薄膜在牛顿液滴上的扩展和吞噬
我们采用保守相场晶格玻尔兹曼法研究了牛顿液滴与不相溶粘弹性液膜接触时的动力学。我们通过数值模拟探索了三相液体的动力学,重点说明了接触线动力学和 Oldroyd-B 模型所描述的粘弹性效应。液滴动力学与牛顿流体薄膜的情况进行了对比。模拟结果表明,当薄膜具有粘弹性时,当聚合物粘度和弛豫时间较大时,液滴动力学对薄膜厚度不敏感。在移动的接触线上会形成粘弹性脊,它的变化与时间呈幂律关系。通过使用脊的高度和宽度重新标定脊的界面轮廓,它似乎会塌缩成类似的形状。我们的研究结果表明,粘弹性应力与接触线附近的界面形状之间存在很强的相关性。
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来源期刊
Physical Review Fluids
Physical Review Fluids Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
5.10
自引率
11.10%
发文量
488
期刊介绍: Physical Review Fluids is APS’s newest online-only journal dedicated to publishing innovative research that will significantly advance the fundamental understanding of fluid dynamics. Physical Review Fluids expands the scope of the APS journals to include additional areas of fluid dynamics research, complements the existing Physical Review collection, and maintains the same quality and reputation that authors and subscribers expect from APS. The journal is published with the endorsement of the APS Division of Fluid Dynamics.
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