Study on droplet deformation of an immiscible fluid system by selective radiation heat using infrared laser,Polymer Engineering and Science

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Study on droplet deformation of an immiscible fluid system by selective radiation heat using infrared laser
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-02-23 , DOI: 10.1002/pen.25674
Gea Fardias Mu'min ₁ , Kawaguchi Tatsuya ₁ , Takushi Saito ₁

Affiliation

The droplet deformation's mechanism in a simple shear flow is well understood, but most studies only considered a uniform temperature field of immiscible droplet systems. This research investigates the possible droplet deformation and visualizes its evolution under selective radiation heating, which is a novel method to modify droplet dispersion via thermo‐physical mechanism. Polybutenes and PDMS silicone oils were employed as the dispersed droplet phase and matrix phase, respectively. Results showed that the mean value of the droplet's modified deformation parameter was limited to 0.12 and 0.08 at an isothermal ambient room temperature having a viscosity ratio of 4.32 and 17.69, respectively. The droplet under selective radiation was visualized. Experimental investigation showed that the selective radiation method enhanced the droplet deformation, as confirmed by the obtained droplet image during laser irradiation process, even allowing droplet breakup. At a moderate level of viscosity ratio (4.32), selective radiation can be applied effectively, whereas at a higher level of viscosity ratio (17.69), droplet elongation‐breakup and droplet retraction were observed.

中文翻译：

红外激光选择性辐射热作用下的不混溶流体系统液滴变形研究

简单剪切流中液滴变形的机理已广为人知，但大多数研究仅考虑了不混溶液滴系统的均匀温度场。这项研究调查了可能的液滴变形，并在选择性辐射加热下可视化了液滴的演化，这是一种通过热物理机制改变液滴分散性的新方法。聚丁烯和PDMS硅油分别用作分散液滴相和基质相。结果表明，在等温室温下，其粘度比分别为4.32和17.69时，液滴的变形参数修正值的平均值分别限制为0.12和0.08。观察选择性辐射下的液滴。实验研究表明，选择性辐射方法增强了液滴变形，正如在激光照射过程中获得的液滴图像所证实的那样，甚至允许液滴破裂。在中等粘度比（4.32）下，可以有效地施加选择性辐射，而在较高粘度比（17.69）下，观察到液滴伸长-破裂和液滴回缩。

更新日期：2021-04-09

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