A fully transient approach on evaporation of multi-component droplets

Arabkhalaj, Arash; Azimi, Asghar; Ghassemi, Hassan; Markadeh, Rasoul Shahsavan

doi:10.1016/j.applthermaleng.2017.07.054

Cited by 14 publications

(11 citation statements)

References 41 publications

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“…elementary droplet evaporation configuration, of a single, spherical, pure droplet in a quiescent, infinite, isotropic, gaseous medium is a foundational problem, the understanding of which is fundamental to addressing more complex systems (e.g. non-spherical [7], moving droplets [8][9][10][11], multi-component droplets [11][12][13][14] and droplet clusters [15][16][17]). This article addresses this important fundamental problem and the scope of the following discussion is confined to studies that present key developments in the understanding of this specific problem.…”

mentioning

confidence: 99%

Deviations from classical droplet evaporation theory

2021

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In this article, we show that significant deviations from the classical quasi-steady models of droplet evaporation can arise solely due to transient effects in the gas phase. The problem of fully transient evaporation of a single droplet in an infinite atmosphere is solved in a generalized, dimensionless framework with explicitly stated assumptions. The differences between the classical quasi-steady and fully transient models are quantified for a wide range of the 10-dimensional input domain and a robust predictive tool to rapidly quantify this difference is reported. In extreme cases, the classical quasi-steady model can overpredict the droplet lifetime by 80%. This overprediction increases when the energy required to bring the droplet into equilibrium with its environment becomes small compared with the energy required to cool the space around the droplet and therefore establish the quasi-steady temperature field. In the general case, it is shown that two transient regimes emerge when a droplet is suddenly immersed into an atmosphere. Initially, the droplet vaporizes faster than classical models predict since the surrounding gas takes time to cool and to saturate with vapour. Towards the end of its life, the droplet vaporizes slower than expected since the region of cold vapour established in the early stages of evaporation remains and insulates the droplet.

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confidence: 99%

Deviations from classical droplet evaporation theory

2021

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“…The models that interpret the thermodynamic and transport properties as functions of temperature are given in ref [16].…”

Section: Thermodynamic and Transport Propertiesmentioning

confidence: 99%

“…In numerical simulations, different factors that affect droplet vaporization can be isolated and examined independently. Moreover, the evolutions of droplet temperature and diameter can be studied in simulations in wide ranges of pressure and temperature that resemble the engine operating conditions [8][9][10][11][12][13][14][15][16][17][18][19]. At elevated pressures, various fluid dynamic and thermodynamic non-idealities show profound impacts on the behavior of droplet vaporization [7,8,18,19].…”

Section: Introductionmentioning

confidence: 99%

“…[8,21]. Meanwhile, with the increase of pressure, the initial unsteady heating period increases and so does the droplet lifetime [11,15,16,22]. Such a dual effect of the ambient pressure is further affected by the ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Such a dual effect of the ambient pressure is further affected by the ambient temperature. When the droplet reaches its thermodynamic critical state, the vanishing of liquid-gas interface, the enhanced solvability of environment gas in droplet fluid, and the anomalies in various thermal transport properties may lead to additional intricacy to the vaporization process [8,16,18].…”

Section: Introductionmentioning

confidence: 99%

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