The Experimental Study of Evaporation of Water–Alcohol Solution Droplets

Borodulin, V. Yu; Letushko, V. N.; Низовцев, М. И.; Sterlyagov, A. N.

doi:10.1134/s1061933x19030049

Cited by 16 publications

(16 citation statements)

References 22 publications

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“…71 Borodulin et al found a higher temperature drop of 2 °C on a Teflon substrate, during the spontaneous evaporation of a sessile water droplet. 50,72 On more hydrophilic substrates, similar results were obtained. For example, Yakhno et al 74 and Hamamoto et al 47 studied the evaporation of sessile water droplet on glass surfaces and reported a decrease of 1.2 and 2 °C on drop temperatures, respectively.…”

Section: Resultssupporting

confidence: 75%

“…73 Borodulin et al used Teflon substrate and found a temperature drop of 4°during the spontaneous evaporation of a sessile pure ethanol droplet at 24 °C and 24% RH. 50 A few researchers carried out experiments for the evaporative cooling of an ethanol−water binary drop mixture. For example, Hopkins et al investigated the mass and heat transfer of evaporating multicomponent alcohol/water droplets.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, water vapor condensed onto the binary drops at the beginning of the evaporation depending on the initial ethanol concentration in the drop and on the RH in the background gas. 44 Ozturk and Erbil also investigated the effect of RH and reported experimental results on the diffusive drop evaporation behavior of 2 μL pure water, pure ethanol, and ethanol−water binary drops (25,50, and 75% ethanol by wt) under constant RH (36,52,61,71, and 81%) under 25 °C conditions on two flat fluoropolymer surfaces of Teflon-FEP and PTFE. 31 It was found that the constant contact angle (CCθ) mode dominated for most of the drop evaporation process after the initial stages and drop volumes decreased nonlinearly over time for all of the binary compositions.…”

Section: Introductionmentioning

confidence: 99%

“…49 Borodulin et al reported the experimental data on variations in the geometric parameters and surface temperatures of binary ethanol−water drop evaporation with different initial ethanol concentrations. 50 The droplets have been suspended by a thread and applied onto a planar surface. The experiments were conducted under controlled ambient conditions of 24% RH and 24 °C on a Teflon substrate by using drops of 5 μL in volume.…”

Section: Introductionmentioning

confidence: 99%

“…The higher the ethanol concentration in a drop, the closer the character of variations in the surface temperature and geometric parameters of the drop to the variations in the same parameters of a pure alcohol drop. 50 Wang et al studied the evaporation of pure water and binary ethanol−water drops on a PMMA substrate under 55% RH and 25 °C conditions by using drops of volume 4 μL and proposed a diffusion model for the last stage by applying linear regression between contact radius and time. 51 The evaporation process in stage III was found to be partially controlled by the less volatile component ethanol, and the constant contact angle regime, which was observed in the pure water test, was not seen in stage III since the evaporation of ethanol from the mixture drop does not yield a vapor saturation close to the drop interface.…”

Section: Introductionmentioning

confidence: 99%

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Simple Model for Diffusion-Limited Drop Evaporation of Binary Liquids from Physical Properties of the Components: Ethanol–Water Example

Ozturk

Erbil

2020

Langmuir

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The understanding of the evaporation process of drops consisting of binary mixtures, in particular ethanol–water drops, is important in many industries such as ink-jet printing, cooling of microelectronics, and alcohol-added pesticide spray applications. The theory of the diffusion-limited drop evaporation process for pure liquids has been investigated thoroughly, and linear (dV (2/3)/dt) slopes were obtained for most of the cases. However, the evaporation of binary liquid drops was found to be much more complicated than that of the pure liquids due to the change of the composition of the drop by time and there is a need for the development of a new model. The experimental results on the diffusion-limited drop evaporation behavior of ethanol–water binary drops initially containing 25 and 50% ethanol by wt and having a volume of 7 μL were reported on a flat hydrophobic Teflon-FEP substrate under the constant relative humidity of 54% and 25 °C temperature conditions, together with pure liquids. The change of contact angles, heights, and contact radius of the drops by time were monitored with a camera. In a parallel study, the concentration changes in the bulk composition of ethanol–water binary drops of 7 μL (25 and 50% ethanol by wt) by time in the same evaporation conditions were monitored using a refractive index–ethanol concentration calibration curve. Then, the parameters affecting the drop evaporation process, such as total vapor pressures, average diffusion coefficient of binary vapors, average molecular weights, and densities of the liquid drops, were calculated using well-known physical chemistry approaches from the previously published data. These parameters were used to estimate the rate of binary ethanol–water drop evaporation, and it was determined that the proposed model fitted the (dV (2/3)/dt) slopes obtained from experimental data points with lower than 5% error when the surface cooling of the drops was considered.

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