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A Numerical Study of Ethanol-Water Droplet Evaporation
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-5886-415X
2018 (English)In: Journal of engineering for gas turbines and power, ISSN 0742-4795, E-ISSN 1528-8919, Vol. 140, no 2, article id 021401Article in journal (Refereed) Published
Abstract [en]

The present effort focuses on detailed numerical modeling of the evaporation of an ethanol-water droplet. The model intends to capture all relevant details of the process: it includes species and heat transport in the liquid and gas phases, and detailed thermophysical and transport properties, varying with both temperature and composition. Special attention is reserved to the composition range near and below the ethanol/water azeotrope point at ambient pressure. For this case, a significant fraction of the droplet lifetime exhibits evaporation dynamics similar to those of a pure droplet. The results are analyzed, and model simplifications are examined. In particular, the assumptions of constant liquid properties, homogeneous liquid phase composition and no differential volatility may not be valid depending on the initial droplet temperature.

Place, publisher, year, edition, pages
American Society of Mechanical Engineers (ASME) , 2018. Vol. 140, no 2, article id 021401
Keywords [en]
Ethanol, Evaporation, Liquids, Ambient pressures, Composition ranges, Droplet temperature, Ethanol/water azeotrope, Homogeneous liquids, Liquid and gas phasis, Liquid properties, Model simplification, Drops
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-216797DOI: 10.1115/1.4037753Scopus ID: 2-s2.0-85030701328OAI: oai:DiVA.org:kth-216797DiVA, id: diva2:1156811
Note

Export Date: 24 October 2017; Article; CODEN: JETPE; Correspondence Address: Lupo, G.; Department of Mechanics, KTH Royal Institute of TechnologySweden; email: gianlupo@mech.kth.se. QC 20171114

Available from: 2017-11-14 Created: 2017-11-14 Last updated: 2017-11-15Bibliographically approved
In thesis
1. Detailed simulations of droplet evaporation
Open this publication in new window or tab >>Detailed simulations of droplet evaporation
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Droplet evaporation (and condensation) is one of the most common instancesof multiphase flow with phase change, encountered in nature as well as intechnical and industrial applications. Examples include falling rain drops, fogsand mists, aerosol applications like electronic cigarettes and inhalation drugdelivery, engineering applications like spray combustion, spray wet scrubbing orgas absorption, spray drying, flame spray pyrolysis.Multiphase flow with phase change is a challenging topic due to the inter-twined physical phenomena that govern its dynamics. Numerical simulation isan outstanding tool that enables us to gain insight in the details of the physics,often in cases when experimental studies would be too expensive, impracticalor limited.In the present work we focus on simulation of the evaporation of smalldroplets. We perform simulation of evaporation of a pure and two−componentdroplet, that includes detailed thermodynamics and variable physical andtransport properties. Some of the conclusions drawn include the importance ofenthalpy transport by species diffusion in the thermal budget of the system, andthe identification and characterization of evaporating regimes for an azeotropicdroplet.In the second part we develop a method based on the immersed boundaryconcept for interface resolved numerical simulation of laminar and turbulentflows with a large number of spherical droplets that undergo evaporation orcondensation.

Abstract [sv]

Droppförångning (och kondensation) är en av de vanligaste fallen av flerfasflöde med fasförändring, både i naturen och i tekniska och industriella tillämpningar. Exempel är fallande regndroppar, dimma, aerosol-tillämpningar som elektroniskacigaretter och läkemedelsleverans via inandning, tekniska tillämpningar som sprayförbränning, våtskrubbning med sprayning, gasabsorption, spraytorkning samt flammsprayspyrolys. Flerfasflöde med fasförändring är ett utmanande ämne på grund av de sammanflätade fysikaliska fenomen som styr dess dynamik. Numerisk simulering är ett utmärkt verktyg som gör det möjligt för oss att få insikt i detaljerna i fysiken, ofta i fall då experimentella studier skulle vara för dyra, opraktiska eller begränsade. I det nuvarande arbetet fokuserar vi på simulering av förångning av små droppar. Vi utför simulering av förångning av en ren och två−komponentdroppe, som inkluderar detaljerad termodynamik samt varierande fysikaliska och transportegenskaper. Några av de slutsatser som dras inbegriper betydelsen av entalpitransport genom diffusion av olika ämnen i systemets termiska budget samt identifieringen och karakterisering av förångningsregimer för en azeotropiskdroppe. I den andra delen utvecklar vi en metod baserad på det nedsänkta rand konceptet för gränssnittskompletterad numerisk simulering av laminära och turbulenta flöden med ett stort antal sfäriska droppar som genomgår förångning eller kondensering.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017
Series
TRITA-MEK, ISSN 0348-467X
Keywords
droplet, evaporation, phase change, multicomponent, immersed boundary, droppe, förångning, fasövergång, multikomponent, nedsånkt rand
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-217614 (URN)978-91-7729-617-1 (ISBN)
Presentation
2017-12-18, E52, Osquars backe 14, Stockholm, 13:00 (English)
Supervisors
Note

QC 20171117

Available from: 2017-11-17 Created: 2017-11-15 Last updated: 2017-11-17Bibliographically approved

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Lupo, GiandomenicoDuwig, Christophe

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