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14:40
20 mins
Direct vapor distribution measurement for single- and multi-component evaporating droplets
Hyoungsoo Kim, Minhyeok Kuk, Jeongsu Pyeon
Session: Novel experimental measurement methods V
Session starts: Thursday 06 November, 14:20
Presentation starts: 14:40
Room: Commission roon 2
Hyoungsoo Kim (KAIST)
Minhyeok Kuk (KAIST)
Jeongsu Pyeon (KAIST)
Abstract:
We present an interferometric study of vapor transport characteristics in evaporating acetone-water binary and single-component sessile droplets using Mach-Zehnder laser interferometry. Simultaneously, vapor distribution near the interface is monitored to reveal key interfacial properties, including surface tension and density gradients. We report orientation-dependent evaporation behaviors for highly volatile single-component droplets such as acetone, where the difference in molecular weight between the vapor and ambient air significantly alters the evaporative flux. For binary mixtures, experiments with varying droplet orientations reveal that gravitational effects inside the droplet also influence the evaporation dynamics. This approach enables correlation of local interfacial conditions with global evaporative flux behaviors.