Interferometric Imaging of Solvent Vapor of Evaporating Liquid Films

Braig, Felix; Narrog, Florian; Sauer, Hans Martin; Dörsam, Edgar

doi:10.1021/acs.langmuir.1c00566

Cited by 6 publications

(2 citation statements)

References 35 publications

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“…By employing the subtle science of digital vapour interferometry, the dynamics of the vapour cloud surrounding an evaporating surface can be assessed. The application of vapour interferometry for studying evaporating droplets and films has been successfully realised by a few researchers in the past (O'Brien & Saville 1987;Dehaeck, Rednikov & Colinet 2014;Braig et al 2021). In the current study, we focus on quantifying the vapour cloud emitted from a localized evaporation site into an extended volume of ambient gas.…”

Section: Introductionmentioning

confidence: 99%

Evaporation from a cylindrical cavity: effect of gravity on the vapour cloud

Parimalanathan,

Dehaeck,

Hatipogullari

et al. 2024

J. Fluid Mech.

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We examine the vapour cloud of a pure liquid evaporating from a millimetric cylindrical well/cavity/aperture. This is accomplished by injecting the liquid up a vertical pipe towards its outlet onto a horizontal substrate. The injection is halted before the liquid surpasses the substrate level. The resulting final state is a meniscus at or near the pipe's end. The analysis is realised by vapour interferometry (side view over the substrate) closely intertwined with simulations (including Stefan flow), which also help to fill up certain gaps in the measurements and provide computed evaporation rates. Comparison with experiment is facilitated by converting the computed vapour clouds into interferometric images, especially helpful when an inverse (Abel-type) conversion is difficult. Experiments are conducted in both microgravity (via parabolic flights) and ground conditions, thus enabling direct assessment of the role of gravity. The contrast is accentuated by a working liquid with heavy vapour (refrigerant HFE-7100), when instead of being flattened on ground the vapour cloud assumes a roughly hemispherical shape in microgravity. Furthermore, a non-trivial vapour-cloud response to the flight ${\rm g}$ -jitter (residual gravity oscillations) is unveiled, ${\rm g}$ -jitter vibrations posing a challenge for interferometry itself. A number of undesired but curious side issues are revealed. One concerns vapour formed deep inside the pipe during rapid injection and subsequently ejected into the field of view, which is detected experimentally and quantified in terms of vapour Taylor dispersion in the pipe. Others are an injection volume anomaly and parasitic postinjection specifically observed in microgravity conditions.

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Section: Introductionmentioning

confidence: 99%

Evaporation from a cylindrical cavity: effect of gravity on the vapour cloud

Parimalanathan,

Dehaeck,

Hatipogullari

et al. 2024

J. Fluid Mech.

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“…In addition, the vapor field surrounding a droplet will be affected by those of the neighboring droplets. The vapor concentration profile has been visualized through Michelson interferometry, 44 but it is limited to a two-dimensional distribution.…”

Section: ■ Introductionmentioning

confidence: 99%

Analysis of Evaporation of Droplet Pairs by a Quasi-Steady-State Diffusion Model Coupled with the Evaporative Cooling Effect

Yamada,

Isobe,

Horibe

2023

Langmuir

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Multidroplet evaporation is a common phase-change phenomenon not only in nature but also in many industrial applications, including inkjet printing and spray cooling. The evaporation behavior of these droplets is strongly affected by the distance between neighboring droplets, and in particular, evaporation suppression occurs as the distance decreases. However, further quantitative information, such as the temperature and local evaporation flux, is limited because the analytical models of multidroplet evaporation only treat vapor diffusion, and the effect of the latent heat transfer through the liquid−vapor phase change is ignored.Here, we perform a numerical analysis of evaporating droplet pairs that linked vapor diffusion from the droplet surface and evaporative cooling. Heat transfer through the liquid and gas phases is also considered because the saturation pressure depends on the temperature. The results show an increase in the vapor concentration in the region between the two droplets. Consequently, the local evaporation flux in the proximate region significantly decreases with decreasing separation distance. This means that the latent heat transfer through the phase change is diminished, and an asymmetrical temperature distribution occurs in the liquid and gas phases. These numerical results provide quantitative information about the temperature and local evaporation flux of evaporating droplet pairs, and they will guide further investigation of multiple droplet evaporation.

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