Insights into bubble–droplet interactions in high-viscoelastic evaporating polymer droplets

IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL
Gannena K. S. Raghuram, Durbar Roy, D. Chaitanya Kumar Rao, Aloke Kumar, Saptarshi Basu
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Abstract

Polymer droplets subjected to a heated environment have significance in several fields ranging from spray drying, powder formation, and surface coating. In the current work, we study the evaporation of an acoustically levitated high-viscoelastic aqueous polymeric droplet under radiative heating. Depending on the irradiation intensity, we observe bubble nucleation in dilute regime of polymer concentration, contrary to previously observed nucleation in semi-dilute entangled regime for low-viscoelastic polymer droplets. After bubble nucleation, a quasi-steady bubble growth occurs depending on the irradiation intensity and polymer concentrations. Our scaling analysis reveals that initial bubble growth follows Plesset–Zwick criteria, independent of the viscoelastic properties of the polymer solution. Further, we establish that the onset of bubble growth has an inverse nonlinear dependence on the irradiation intensity. The droplet oscillations are primarily driven by the presence of multiple bubbles and, to some extent, by the rotational motion of the droplet. At high polymer concentrations and irradiation intensities, we report the expansion and collapse of polymer membrane without rupture, indicating the formation of an interfacial skin of significant strength. Finally, depending on the nature of bubble growth, different types of precipitate form contrary to the different modes of atomization observed in low-viscoelastic polymer droplets.

Abstract Image

Abstract Image

高粘弹蒸发聚合物液滴中气泡与液滴相互作用的启示
受热环境中的聚合物液滴在喷雾干燥、粉末形成和表面涂层等多个领域都具有重要意义。在当前的研究中,我们研究了声学悬浮高粘弹水性聚合物液滴在辐射加热下的蒸发过程。根据辐照强度的不同,我们观察到聚合物浓度稀释状态下的气泡成核现象,这与之前观察到的低粘弹性聚合物液滴在半稀释纠缠状态下的成核现象相反。气泡成核后,气泡会根据辐照强度和聚合物浓度发生准稳定增长。我们的比例分析表明,初始气泡增长遵循 Plesset-Zwick 标准,与聚合物溶液的粘弹性无关。此外,我们还确定了气泡生长的起始时间与辐照强度成反非线性关系。液滴振荡主要是由多个气泡的存在以及在一定程度上由液滴的旋转运动驱动的。在聚合物浓度和辐照强度较高的情况下,我们报告了聚合物膜的膨胀和坍塌,但没有破裂,这表明形成了强度很大的界面表皮。最后,根据气泡生长的性质,会形成不同类型的沉淀,这与在低粘弹性聚合物液滴中观察到的不同雾化模式相反。
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来源期刊
Experiments in Fluids
Experiments in Fluids 工程技术-工程:机械
CiteScore
5.10
自引率
12.50%
发文量
157
审稿时长
3.8 months
期刊介绍: Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.
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