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Multicomponent and multiphase simulation of liquid-phase sintering
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0003-3132-7252
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
KTH, School of Engineering Sciences (SCI), Mechanics, Physicochemical Fluid Mechanics.ORCID iD: 0000-0003-3336-1462
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.ORCID iD: 0000-0002-4521-6089
2009 (English)In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 47, no 2, 512-520 p.Article in journal (Refereed) Published
Abstract [en]

Numerical simulation of liquid-phase sintering using a multicomponent and multiphase model is presented. The model consists of convective concentration and phase-field equations coupled with the Navier-Stokes equations with surface tension forces. The governing equations are nondimensionalized and an adaptive finite element method is utilized. An idealized phase diagram, surface energies, and typical dimensionless parameters are some input into the model. Important dynamics in liquid-phase sintering such as rapid wetting and motion of particles due to capillary forces are studied. Some factors that are known to significantly affect the dynamics of the sintering process such as contact angles and volume ratios are also investigated. In addition, numerical results on the motion of particles due to capillary forces were compared with an existing analytical model. Good agreement between numerical and analytical results is obtained within the validity of the analytical model.

Place, publisher, year, edition, pages
2009. Vol. 47, no 2, 512-520 p.
Keyword [en]
Liquid-phase sintering, Multicomponent and multiphase model, Navier-Stokes flow, Wetting, Capillary-driven flow, REARRANGEMENT PROCESSES, WETTING BEHAVIOR, FIELD APPROACH, SIC CERAMICS, MODEL
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-13650DOI: 10.1016/j.commatsci.2009.09.018ISI: 000273115500029Scopus ID: 2-s2.0-70449622731OAI: oai:DiVA.org:kth-13650DiVA: diva2:326312
Note

QC 20100622

Available from: 2010-06-22 Created: 2010-06-22 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Diffuse-Interface Simulations of Capillary Phenomena
Open this publication in new window or tab >>Diffuse-Interface Simulations of Capillary Phenomena
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Fluid flows mainly driven by capillary forces are presented in this thesis. By means of modeling and simulations, interesting dynamics in capillary-driven flows are revealed such as coalescences, breakups, precursor films, flow instabilities, rapid spreading, rigid body motions, and reactive wetting.

Diffuse-interface methods model a fluid interface as having a finite thickness endowed with physical properties such as surface tension. Two diffuse-interface models that are based on the free energy of the system are presented. The binary model, more specifically the coupled Navier-Stokes/Cahn-Hilliard equations, was used to study different two-phase flows including problems related to microfluidics. Numerical issues using this model have been addressed such as the need for mesh adaptivity and time-step restrictions. Moreover, the flexibility of this model to simulate 2D, axisymmetric, and 3D flows has been demonstrated.

The factors affecting reproducibility of microdroplet depositions performed under a liquid medium are investigated. In the deposition procedure, sample solution is dispensed from the end of a capillary by the aid of a pressure pulse onto a substrate with pillar-shaped sample anchors. In both the experimental and numerical study it was shown that the deposited volume mainly depends on the capillary-substrate distance and anchor surface wettability. Furthermore, a critical equilibrium contact angle has been identified below which reproducible depositions are facilitated.

The ternary model is developed for more complicated flows such as liquid phase sintering. With the introduction of a Gibbs energy functional, the governing equations are derived, consisting of convective concentration and phase-field equations which are coupled to the Navier-Stokes equations with surface tension forces. Arbitrary phase diagrams, surface energies, and typical dimensionless numbers are some input parameters into the model. Detailed analysis of the important capillary phenomena in liquid phase sintering such as reactive and nonreactive wetting and motion of two particles connected by a liquid bridge are presented. The dynamics of the wetting is found to match with a known hydrodynamic theory for spreading liquids. Factors affecting the equilibrium configuration of the particles such as equilibrium contact angles and volume ratios are also investigated.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. ix, 34 p.
Series
Trita-MEK, ISSN 0348-467X ; 2007:05
Keyword
capillary-driven flows, wetting, Cahn-Hilliard/Navier-Stokes system, multicomponent and multiphase flows, parallel adaptive computing
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-4402 (URN)978-91-7178-718-7 (ISBN)
Public defence
2007-06-08, Sal F2, KTH, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100823Available from: 2007-05-29 Created: 2007-05-29 Last updated: 2010-08-23Bibliographically approved

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Villanueva, WalterAmberg, Gustav

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