Modeling of spray flash evaporation based on droplet analysis

Cai, Benan; Tuo, Xiaobing; Song, Zichen; Zheng, Yulong; Gu, Hongfang; Wang, Haijun

doi:10.1016/j.applthermaleng.2017.11.083

Cited by 34 publications

(7 citation statements)

References 28 publications

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“…It is important to point out that this estimation of the average droplet evaporation rate is a qualitative information which ignores the dependence of the evaporation rate with the droplet size, velocity, or the presence of temperature gradients. 24,27 3.3. Morphology of Caffeine Crystals by SFE.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the condensation of solvent vapors may occur as the filter surface is cooled by the evaporating solvent. It is important to point out that this estimation of the average droplet evaporation rate is a qualitative information which ignores the dependence of the evaporation rate with the droplet size, velocity, or the presence of temperature gradients. , …”

Section: Resultsmentioning

confidence: 99%

“…As an aerosol-based process, particles formed by SFE will largely depend on droplets; crucial attention should be paid to characterize their size, velocity, and evaporation rate to evidence how these values correlate with the particle size and crystallization process. − Although the droplet size is mainly controlled by the nozzle shape, little is known about how the solvent properties (vapor pressure, boiling temperature, viscosity, etc. ) and process parameters such as the injected liquid pressure ( P i ) and temperature ( T i ) affect the properties of the aerosol and the formed particles.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

From Microdroplets to Microcrystals: Tunable Caffeine Particles by Spray Flash Evaporation

Busby

Lobry

Schnell

et al. 2021

Crystal Growth & Design

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In this work, tunable caffeine crystals are formulated through a promising aerosol-based technology called spray flash evaporation (SFE). In this process, the vacuum atomization of a superheated and pressurized solution allows for the continuous flow and mass production of organic particles with tunable sizes and morphologies depending on the process parameters. Despite its versatility, the widespread application of SFE technology is still mainly hindered by the lack of systematic experimental works showing the correlation among the aerosol properties, such as the droplet size and solvent evaporation rate, the filtering method, and the final product morphology. Here, we characterize pure solvent aerosols, ethanol and dichloromethane, by in situ phase Doppler particle analysis and apply these solvents to grow caffeine rods with lengths ranging from submicron to 30 μm and different agglomeration states depending on the specific process and collection conditions. The nucleation and growth mechanisms are derived from accurate investigations on scanning electron micrographs. Results show the high potential and versatility of SFE for processing micron and submicron organic particles for many applications in biomaterials and pharmaceutics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

From Microdroplets to Microcrystals: Tunable Caffeine Particles by Spray Flash Evaporation

Busby

Lobry

Schnell

et al. 2021

Crystal Growth & Design

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show abstract

“…Mathematical modeling is a powerful tool in physics, chemistry, and engineering for interpretation and prediction of natural phenomena and experimental results [11]. A mathematical model of spray drying process is a simplification of the phenomenon based on material and energy balances [12].…”

Section: Design Modelsmentioning

confidence: 99%

A comprehensive analysis of critical variables used to design a spray dryer of whey protein concentrates

Barrios

Perez

Telotte

2020

CI&CEQ

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“…Wang et al (2017) studied water droplet flash evaporation in vacuum spray cooling and proposed a one-dimensional droplet flash evaporation model by introducing a simple heat balance correlation and a phase transition model to Fick's law. Besides, Cai et al (2018) and Zhang et al (2013) also studied the heat transfer characteristics of flash evaporation. However, the theoretical model for the droplet evaporation due to depressurization is not mature.…”

Section: Introductionmentioning

confidence: 99%

Ratio analysis of two mechanisms of static droplet evaporation driven by pressure difference

Zhao

Liu

Lin

et al. 2019

Exp. Comput. Multiph. Flow

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When droplet moving in the steam-water separator, the gas pressure will decrease due to flow resistance and the liquid-vapor equilibrium at the droplet surface will be broken. The droplet evaporates continuously as a result. The fast evaporation mechanism and thermal balance evaporation mechanism are presented for the droplet evaporation at cases of pressure variation. The droplet phase change model due to pressure variation is formulated. Subsequently, the effects of pressure difference on the droplet evaporation characteristics are analyzed. The ratio analysis of the two mechanisms is conducted. The droplet evaporation map over the ratio of two mechanisms is drawn. The numerical results indicate that the pressure difference significantly influences the droplet evaporation characteristics. Under most conditions, the droplet evaporation characteristics are dominated by the combined action of two mechanisms. For large pressure difference and small droplets, the fast evaporation mechanism dominates the evaporation process, and vice versa. With increasing pressure difference between the droplet and the surrounding environment, the droplet evaporates faster and the percentage of fast evaporation mechanism decreases gradually. The present work can lay the foundation for further investigation on the moving droplet evaporation.

show abstract

Modeling of spray flash evaporation based on droplet analysis

Cited by 34 publications

References 28 publications

From Microdroplets to Microcrystals: Tunable Caffeine Particles by Spray Flash Evaporation

From Microdroplets to Microcrystals: Tunable Caffeine Particles by Spray Flash Evaporation

A comprehensive analysis of critical variables used to design a spray dryer of whey protein concentrates

Ratio analysis of two mechanisms of static droplet evaporation driven by pressure difference

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