Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session M13: Drop Evaporation
8:00 AM–10:10 AM,
Tuesday, November 20, 2018
Georgia World Congress Center Room: B218
Chair: Cody Brownell, US Naval Academy
Abstract ID: BAPS.2018.DFD.M13.2
Abstract: M13.00002 : Direct Optical Measurement of Evaporative Flux of Volatile Liquid Droplets*
8:13 AM–8:26 AM
An evaporating single-component liquid droplet leaves a coffee-ring stain after completely dried, which is due to the non-uniform evaporation rate along the surface of a droplet. So far, the evaporative flux is rarely measured while based on analytical models, indirect measurements, or model-based experiments, the flux profile is estimated. To understand the evaporation mechanism of the droplet is often important to control deposit patterns demanded by various industries including inkjet printing, biochemical applications. In this study, we utilized an optical interferometric measurement technique (Mach-Zehnder interferometer) to detect the optical distortion near the surface of an evaporating droplet. The optical signal represents variation of refractive indices and media density. Using Fourier transform profilometry based fringe analysis, we investigate the time-dependent evaporative flux profile of different volatile liquid droplets in the vicinity of the liquid-air interface. Furthermore, we explore effects of gravity and molar mass of the volatile liquid on the evaporative flux profile.
*This work was supported by the Young Researchers Program (NRF-2018R1C1B6004190) of the National Research Foundation of Korea and BK21 Plus Program.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M13.2
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