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A Combined Computational and Experimental Investigation on Evaporation of a Sessile Water Droplet on a Heated Hydrophilic Substrate | | Manish Kumar
; Rajneesh Bhardwaj
; | | Date: |
Sun, 31 Mar 2019 15:12:24 GMT (1895kb) | | Abstract: | We numerically and experimentally investigate evaporation of a sessile
droplet on a heated substrate. We develop a finite element (FE) model in
two-dimensional axisymmetric coordinates to solve coupled transport of heat in
the droplet and substrate, and of the mass of liquid vapor in surrounding
ambient while assuming diffusion-limited, quasi-steady evaporation of the
droplet. The two-way coupling is implemented using an iterative scheme and
under-relaxation is used to ensure numerical stability. The FE model is
validated against the published spatial profile of the evaporation mass flux
and temperature of the liquid-gas interface. We discuss cases in which the
two-way coupling is significantly accurate than the one-way coupling. In
experiments, we visualized side view of an evaporating microliter water droplet
using a high-speed camera at different substrate temperatures and recorded
temperature of the liquid-gas interface from the top using an infrared camera.
We examine the dependency of inversion of the temperature profile across the
liquid-gas interface on the ratio of the substrate thickness to the wetted
radius, the ratio of the thermal conductivity of the substrate to that of the
droplet and contact angle. A comparison of measured evaporation mass rate with
the computed values at different substrate temperature show that the
evaporation mass rate increases non-linearly with respect to the substrate
temperature, and FE model predicts these values close to the experimental data.
Comparisons of time-averaged evaporation mass rate obtained by the previous and
present models against the measurements suggest that the evaporative cooling at
the interface and variation of diffusion coefficient with temperature should be
taken into account in the model in order to accurately capture the
measurements. | | Source: | arXiv, 1907.5486 | | Services: | Forum | Review | PDF | Favorites | |
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