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Study on droplet deformation of an immiscible fluid system by selective radiation heat using infrared laser
Author(s) -
Mu'min Gea Fardias,
Tatsuya Kawaguchi,
Saito Takushi
Publication year - 2021
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25674
Subject(s) - materials science , deformation (meteorology) , breakup , viscosity , radiation , isothermal process , composite material , thermodynamics , mechanics , optics , physics
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.