Estimation of Condensation Coefficient by Dropwise Condensation Method. Condensation Coefficients of Ethylene Glycol and Water.

Tsuruta, Takaharu; Kato, Y.; Yasunobu, Tsuyoshi; Masuoka, Takashi

doi:10.1299/kikaib.60.508

Cited by 6 publications

(9 citation statements)

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“…Taking into account the likely underestimation of Δ D 298 / D 298 caused by moisture interference and impurity effect, α M should be greater than 0.4. This range is above the result from Jakubczyk et al () and agrees with the result from Tsuruta et al (). Limited by the accuracies of D 298 for EG and V g in the EDB measurement, it is difficult to constrain the α M range further in this study.…”

Section: Resultssupporting

confidence: 91%

“…Results show that α M should be greater than 0.4 for EG. This range is beyond the result from Jakubczyk et al () and agrees with the result from Tsuruta et al (). The fitted points of ( V g and Δ D 298 / D 298 ) falling within the rectangle regions are all above the zero line (Δ D 298 / D 298 = 0), which indicates that the true value of D 298 might be a little higher than the present value used in this study.…”

Section: Discussionsupporting

confidence: 90%

“…For water, many studies have reported α M through measurements of evaporation/condensation kinetics (Davies et al, ; Hołyst et al, ; Langridge et al, ; Marek & Straub, ; Miles et al, ; Raatikainen et al, ; Tsuruta et al, ; Winkler et al, ). Results from experiments using a variety of ensemble and single‐particle techniques confirm that α M is greater than 0.2 (Langridge et al, ; Miles et al, ) and even close to 1 (Davies et al, ; Raatikainen et al, ; Winkler et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Tsuruta et al () determined the α M of ethylene glycol (EG) and water using a dropwise condensation method. They reported that the α M value for EG is in the range of 0.17–0.45 at 0.24–1.57 kPa.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evaporation Kinetics of Polyol Droplets: Determination of Evaporation Coefficients and Diffusion Constants

Marsh

Haddrell

et al. 2017

JGR Atmospheres

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In order to quantify the kinetics of mass transfer between the gas and condensed phases in aerosol, physicochemical properties of the gas and condensed phases and kinetic parameters (mass/thermal accommodation coefficients) are crucial for estimating mass fluxes over a wide size range from the free molecule to continuum regimes. In this study, we report measurements of the evaporation kinetics of droplets of 1‐butanol, ethylene glycol (EG), diethylene glycol (DEG), and glycerol under well‐controlled conditions (gas flow rates and temperature) using the previously developed cylindrical electrode electrodynamic balance technique. Measurements are compared with a model that captures the heat and mass transfer occurring at the evaporating droplet surface. The aim of these measurements is to clarify the discrepancy in the reported values of mass accommodation coefficient (αM, equals to evaporation coefficient based on microscopic reversibility) for 1‐butanol, EG, and DEG and improve the accuracy of the value of the diffusion coefficient for glycerol in gaseous nitrogen. The uncertainties in the thermophysical and experimental parameters are carefully assessed, the literature values of the vapor pressures of these components are evaluated, and the plausible ranges of the evaporation coefficients for 1‐butanol, EG, and DEG as well as uncertainty in diffusion coefficient for glycerol are reported. Results show that αM should be greater than 0.4, 0.2, and 0.4 for EG, DEG, and 1‐butanol, respectively. The refined values are helpful for accurate prediction of the evaporation/condensation rates.

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Section: Resultssupporting

confidence: 91%

Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaporation Kinetics of Polyol Droplets: Determination of Evaporation Coefficients and Diffusion Constants

Marsh

Haddrell

et al. 2017

JGR Atmospheres

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“…The measurements for other vapour-liquid systems are fewer and similarly nonconclusive. Adsorption of heterogeneous vapours on liquid water seems to attract more attention (see [67][68][69][70][71][72] and [73] for reviews) than single-component evaporation/condensation (see [35] and references therein, and [49,[74][75][76]). The results seem to suggest that a low evaporation coefficient corresponding to a high interfacial barrier is not unique for water [46,72].…”

Section: Discussion Of Evaporation Coefficient Issuesmentioning

confidence: 99%

Evaporation of freely suspended single droplets: experimental, theoretical and computational simulations

et al. 2013

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Evaporation is ubiquitous in nature. This process influences the climate, the formation of clouds, transpiration in plants, the survival of arctic organisms, the efficiency of car engines, the structure of dried materials and many other phenomena. Recent experiments discovered two novel mechanisms accompanying evaporation: temperature discontinuity at the liquid-vapour interface during evaporation and equilibration of pressures in the whole system during evaporation. None of these effects has been predicted previously by existing theories despite the fact that after 130 years of investigation the theory of evaporation was believed to be mature. These two effects call for reanalysis of existing experimental data and such is the goal of this review. In this article we analyse the experimental and the computational simulation data on the droplet evaporation of several different systems: water into its own vapour, water into the air, diethylene glycol into nitrogen and argon into its own vapour. We show that the temperature discontinuity at the liquid-vapour interface discovered by Fang and Ward (1999 Phys. Rev. E 59 417-28) is a rule rather than an exception. We show in computer simulations for a single-component system (argon) that this discontinuity is due to the constraint of momentum/pressure equilibrium during evaporation. For high vapour pressure the temperature is continuous across the liquid-vapour interface, while for small vapour pressures the temperature is discontinuous. The temperature jump at the interface is inversely proportional to the vapour density close to the interface. We have also found that all analysed data are described by the following equation: da/dt = P(1)/(a + P(2)), where a is the radius of the evaporating droplet, t is time and P(1) and P(2) are two parameters. P(1) = -λΔT/(q(eff)ρ(L)), where λ is the thermal conductivity coefficient in the vapour at the interface, ΔT is the temperature difference between the liquid droplet and the vapour far from the interface, q(eff) is the enthalpy of evaporation per unit mass and ρ(L) is the liquid density. The P(2) parameter is the kinetic correction proportional to the evaporation coefficient. P(2) = 0 only in the absence of temperature discontinuity at the interface. We discuss various models and problems in the determination of the evaporation coefficient and discuss evaporation scenarios in the case of single- and multi-component systems.

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Numerical scrutinization of dropwise condensation heat transfer on an inclined surface

2022

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Recently, achieving an ameliorated heat transfer rate in dropwise condensation (DWC) has attracted the attention of many researchers. Several parameters, including chemical and physical properties of the substrate, inclination, and interfacial characteristics influence DWC heat transfer rate. The variation of inclination angle is followed by the change in droplet shape and consequently, the heat transfer rate are changed. In this study, the effect of droplet shape variation on diverse inclined substrates is simulated. Moreover, three‐dimensional mass, momentum, and energy equations considering the desired boundary conditions on the unstructured grid are utilized for the scrutinization of flow behavior and heat transfer for static and sliding droplets. For the sake of validation, the outcomes obtained from the simulation were compared with existent data in the literature and a proper agreement was attained. Regarding the outcomes, it was of concern that the influence of inclination angle on the droplet shape is more distinct at higher droplet volume; while no considerable change was seen on heat flux of small droplets by increasing the inclination angle. Furthermore, a higher heat transfer rate was noted by exceeding the inclination angle beyond a definite angle. Additionally, the increased heat transfer rate was affirmed by increasing the Marangoni number ( italicMa ) $({Ma})$.

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Estimation of Condensation Coefficient by Dropwise Condensation Method. Condensation Coefficients of Ethylene Glycol and Water.

Cited by 6 publications

References 0 publications

Evaporation Kinetics of Polyol Droplets: Determination of Evaporation Coefficients and Diffusion Constants

Evaporation Kinetics of Polyol Droplets: Determination of Evaporation Coefficients and Diffusion Constants

Evaporation of freely suspended single droplets: experimental, theoretical and computational simulations

Numerical scrutinization of dropwise condensation heat transfer on an inclined surface

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