Influence of a Surfactant on Evaporation Intensity of Suspended Water Droplets


Experimental data have been presented on the evaporation rate of suspended droplets of both pure water and water containing ≈1.5 wt % surfactant, sodium dodecyl sulfate. Evaporation occurs in a convective flow of dry air, with its velocity and temperature being varied within ranges of U0 = 1–5 m/s and T0 = 20–80°C, respectively. The density of the mass flux from the surface of the surfactant-containing droplets is 2–3 times lower than that in the case of pure water. For droplets in a dry air flow, the change in their diameter can be described by a set of similarity criteria, and a generalized linear empirical dependence of the evaporation rate on thermodynamic parameters may be constructed for these droplets.

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The work was carried out within the framework of the state order to the Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, under the AAAA-A17-117030310010-9 program.

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Correspondence to N. E. Shishkin.

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Terekhov, V.I., Shishkin, N.E. Influence of a Surfactant on Evaporation Intensity of Suspended Water Droplets. Colloid J 83, 135–141 (2021).

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