Modeling and Simulation of Single Ethanol/Water Droplet Evaporation in Dry and Humid Air

Narasu, Praveen; Boschmann, S.; Pöschko, P.; Zhao, Fulong; Gutheil, Eva

doi:10.1080/00102202.2020.1724980

Cited by 23 publications

(36 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These conditions are chosen following the experimental conditions of a typical FSP burner [9]. For the present conditions, the Weber numbers stay well below the critical Weber number for which droplet breakup may occur and below thermal and mass Peclet numbers for which the distillation-limit model and the rapidmixing models are valid [12]. First, the ambient temperature of 400 K is studied for which the thermal decomposition does not occur because the temperature is below the thermal decomposition temperature of 403 K, and then, higher ambient initial gas temperatures are considered.…”

Section: Resultsmentioning

confidence: 99%

“…The thermal decomposition of the INN occurs for temperatures beyond 403 K, transferring the precursor droplet entirely into the gas phase. For the completion of the model, the heating and evaporation of the water and the ethanol must be described [12].…”

Section: Thermal Decompositionmentioning

confidence: 99%

“…The droplet evaporation is described by the rapid-mixing model the applicability of which for the present conditions has been discussed by Narasu et al [12] for the heating and evaporation of bi-component ethanol/water droplets in convective air. The study includes the Abramzon and Sirignano [7] model that was extended to account for the mass evaporation rate of a multicomponent droplet by Brenn et al [8].…”

Section: Convective Droplet Heating and Evaporationmentioning

confidence: 99%

“…The study includes the Abramzon and Sirignano [7] model that was extended to account for the mass evaporation rate of a multicomponent droplet by Brenn et al [8]. Narasu et al [12] present a validation of the rapid-mixing and the distillationlimit models for the ethanol/water evaporation in convective air.…”

Section: Convective Droplet Heating and Evaporationmentioning

confidence: 99%

“…The temperature dependence of the latent heat of evaporation is described using the extended Watson equation [15]. It is expected that the liquid mixture may not be ideal, and therefore, non-ideality is considered through the use of activity coefficients of ethanol and water through the UNIFAC method [16] described in detail by Narasu et al [12]. The activity coefficient of the INN/ethanol mixture is not available and is neglected.…”

Section: Physical Propertiesmentioning

confidence: 99%

See 4 more Smart Citations

Numerical Study of Single Iron(III) Nitrate Nonahydrate/Ethanol Droplet Evaporation in Humid Air

Narasu¹,

Keller²,

Kohns³

et al. 2020

World Congress on Momentum, Heat and Mass Transfer

View full text Add to dashboard Cite

The heating and evaporation of spherically symmetric droplets consisting of a precursor solution of iron(III) nitrate nonahydrate (INN) and ethanol for nanoparticle synthesis in spray flames is studied numerically. The multicomponent droplets are at standard conditions and the evaporation is initiated through the elevated temperature of the convective ambient air. The liquid mixture properties of INN and ethanol used in the model are fits to new experimental data which are valid in the temperature range of 293.15 K through 333.15 K and for mass fractions of INN in ethanol up to 0.34. In general, there are two different pathways through which the nanoparticle synthesis may occur from the precursor solution. In the first pathway, the particle forms directly inside the liquid precursor solution, and in the second pathway, the droplet is transferred entirely into the gas phase from which the nanoparticle may form. The INN/ethanol precursor droplet is treated as a three-component solution consisting of ethanol, iron(III) nitrate, and water, where the INN consists of the latter two. The process is initially governed by the ethanol evaporation and later by water evaporation since ethanol is more volatile component. Further decomposition and liquid-phase reactions may occur inside the precursor droplet, eventually leaving over an iron (III) nitrate particle or transferring the iron (III) nitrate into the gas phase, which happens beyond the thermal decomposition temperature of 403 K beyond which the iron (III) nitrate may decompose into gaseous Fe2O3, so that the entire INN/ethanol droplet transforms into the gas phase. The study presents simulations of the evaporation of the INN/ethanol droplet for both situations.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Thermal Decompositionmentioning

confidence: 99%

Section: Convective Droplet Heating and Evaporationmentioning

confidence: 99%

Section: Convective Droplet Heating and Evaporationmentioning

confidence: 99%

Section: Physical Propertiesmentioning

confidence: 99%

See 3 more Smart Citations

Numerical Study of Single Iron(III) Nitrate Nonahydrate/Ethanol Droplet Evaporation in Humid Air

Narasu¹,

Keller²,

Kohns³

et al. 2020

World Congress on Momentum, Heat and Mass Transfer

View full text Add to dashboard Cite

show abstract

Morphology of Silver Particles and Films Arising from Particle‐Free Silver Ink Droplet Evaporation

Zhang,

Yang,

Knopf

2023

Adv Materials Inter

View full text Add to dashboard Cite

The evaporation of particle‐free silver ink droplets on heated substrates directly impacts the morphology of the resultant silver particles and electrically conductive inkjet‐printed films. In this work, COMSOL Multiphysics simulations of the droplet evaporation process are used to help explain the fluidic processes responsible for the experimental observations. The results show that the silver particle morphology depends on its location within the evaporating droplet where large particles (3 to 5 µm) accumulate at the center and smaller ones (1 to 2 µm) in the area beyond the central region. The smallest particles (≈500 nm) are near the contact line. Without the fluoro‐surfactant FS‐31, an inner ring with 3 µm particles also appears within the evaporating droplet. The large particles at the central region originate from the fluid near the droplet's apex due to the accumulation of polyacrylamide in the concentrated ethylene glycol solvent near the flow‐abundant apex. Furthermore, the capillary flow along the fluid–air interface transports silver ions and particles throughout the droplet, causing the larger particles to fall onto the substrate at the central vortex, forming the inner ring. The simulations also demonstrate that the evaporating droplet heterogeneously accumulates ethylene glycol in a sandhill formation at the bottom center.

show abstract

Analyse der Partikelbildung aus der Elektrospray‐Flammensprühpyrolyse mittels Scanning Mobility Particle Sizer

Bierwirth¹,

Olszok

Ganesan

et al. 2021

Chemie Ingenieur Technik

View full text Add to dashboard Cite

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.Die elektrohydrodynamische Zerstäubung von flüssigen Präkursoren gekoppelt mit der Flammensprühpyrolyse erlaubt die Synthese von verschiedenartigen, metalloxidischen Nanopartikel. Ein Aufbau bestehend aus einem definiert verfahrbaren Brenner und einer Probennahme in der Flamme eröffnet dabei die Möglichkeit der Erfassung von Partikelgrößenverteilungen entlang der Flammenhöhe. Die Bildung von Eisenoxid-und Siliziumdioxid-Partikel in einer Flamme konnte so mithilfe eines 1nm-SMPS-Aufbaus (Scanning Mobility Particle Sizer) auch in den Frühstadien der Partikelbildung erfasst werden. Hierbei zeigte sich, dass auch für einfache Präkursorlösungen bei hinreichend kleinen Tropfen hochwertige, homogene Nanopulver erzeugt werden können.

show abstract

Modeling and Simulation of Single Ethanol/Water Droplet Evaporation in Dry and Humid Air

Cited by 23 publications

References 21 publications

Numerical Study of Single Iron(III) Nitrate Nonahydrate/Ethanol Droplet Evaporation in Humid Air

Numerical Study of Single Iron(III) Nitrate Nonahydrate/Ethanol Droplet Evaporation in Humid Air

Morphology of Silver Particles and Films Arising from Particle‐Free Silver Ink Droplet Evaporation

Analyse der Partikelbildung aus der Elektrospray‐Flammensprühpyrolyse mittels Scanning Mobility Particle Sizer

Contact Info

Product

Resources

About