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An Immersed Boundary Method for flows with evaporating droplets
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-1095-118X
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0003-4328-7921
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre. Norwegian Univ Sci & Technol NTNU, Dept Energy & Proc Engn, Stockholm, Sweden..ORCID iD: 0000-0002-4346-4732
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-5886-415X
2019 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, E-ISSN 1879-2189, Vol. 143, article id 118563Article in journal (Refereed) Published
Abstract [en]

We present a new Immersed Boundary Method (IBM) for the interface resolved simulation of spherical droplet evaporation in gas flow. The method is based on the direct numerical simulation of the coupled momentum, energy and species transport in the gas phase, while the exchange of these quantities with the liquid phase is handled through global mass, energy and momentum balances for each droplet. This approach, applicable in the limit of small spherical droplets, allows for accurate and efficient phase coupling without direct solution of the liquid phase fields, thus saving computational cost. We provide validation results, showing that all the relevant physical phenomena and their interactions are correctly captured, both for laminar and turbulent gas flow. Test cases include fixed rate and free evaporation of a static droplet, displacement of a droplet by Stefan flow, and evaporation of a hydrocarbon droplet in homogeneous isotropic turbulence. The latter case is validated against experimental data, showing the feasibility of the method towards the treatment of conditions representative of real life spray fuel applications.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 143, article id 118563
Keywords [en]
Spray, Fuel, Evaporation, Phase change, Immersed boundary, Multiphase, Direct numerical simulation
National Category
Engineering and Technology
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kth:diva-261933DOI: 10.1016/j.ijheatmasstransfer.2019.118563ISI: 000487564400090Scopus ID: 2-s2.0-85070927066OAI: oai:DiVA.org:kth-261933DiVA, id: diva2:1361255
Note

QC 20191015

Available from: 2019-10-15 Created: 2019-10-15 Last updated: 2019-11-26Bibliographically approved
In thesis
1. Advances in droplet evaporation
Open this publication in new window or tab >>Advances in droplet evaporation
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Droplet evaporation (and condensation) is one of the most common instances of multiphase flow with phase change, encountered in nature as well as in technical applications. Examples include falling rain drops, fogs and mists, aerosol applications like electronic cigarettes and inhalation drug delivery, and engineering applications like spray combustion, spray wet scrubbing or gas absorption, spray drying, flame spray pyrolysis. Multiphase flow with phase change is a challenging topic due to the intertwined physical phenomena that govern its dynamics. Numerical simulation is a valuable tool that enables us to gain insight in the details of the physics, often in cases where experimental studies would be too expensive, impractical or limited. In the present work, the focus is on the evaporation of small spherical droplets. Simulation of the evaporation of a pure and two−component droplet, in a stagnant flow, with the inclusion of detailed thermodynamics and variable physical and transport properties, shows the importance of enthalpy transport by species diffusion in the thermal budget of the system, and allows the identification and characterization of evaporating regimes for an azeotropic droplet. A new method for the interface resolved numerical simulation of laminar and turbulent flows with a large number of spherical droplets that undergo evaporation or condensationon, based on the immersed boundary concept, is developed. Validation with experimental data of pure and two−component droplets evaporating in homogeneous isotropic turbulence is conducted. The method is employed for the direct numerical simulation of spray evaporation in a turbulent channel flow, whereby mechanisms of spray migration and turbulence modulation are revealed, and a scaling of the evaporation enhancement with the turbulence is found. The sensitivity of the zero-dimensional multicomponent droplet evaporation model, used for general purpose multiphase flow calculations, to its many model parameters is analysed by uncertainty quantification, providing useful guidelines for the design and operation of droplet evaporation experiments and simulations.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2019. p. 41
Series
TRITA-SCI-FOU ; 53
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics
Identifiers
urn:nbn:se:kth:diva-263228 (URN)978-91-7873-361-3 (ISBN)
Public defence
2019-11-29, Kollegiesalen, Brinellvägen 8, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20191108

Available from: 2019-11-08 Created: 2019-11-04 Last updated: 2019-11-19Bibliographically approved

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Lupo, GiandomenicoNiazi Ardekani, MehdiBrandt, LucaDuwig, Christophe

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