Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Microdroplet deposition under a liquid medium
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0003-3132-7252
KTH, Skolan för kemivetenskap (CHE), Kemi, Analytisk kemi.
KTH, Skolan för kemivetenskap (CHE), Kemi, Analytisk kemi.
KTH, Skolan för kemivetenskap (CHE), Kemi, Analytisk kemi.
Vise andre og tillknytning
2007 (engelsk)Inngår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 23, nr 3, s. 1171-1177Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

An experimental and numerical study of the factors affecting the reproducibility of microdroplet depositions performed under a liquid medium is presented. 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. The deposition was modeled using the convective Cahn-Hilliard equation coupled with the Navier-Stokes equations with added surface tension and gravity forces. To avoid a severe time-step restriction imposed by the fourth-order Cahn-Hilliard equation, a semi-implicit scheme was developed. An axisymmetric model was used, and an adaptive finite element method was implemented. In both the experimental and numerical study it was shown that the deposited volume mainly depends on the capillary-substrate distance and the anchor surface wettability. A critical equilibrium contact angle has been identified below which reproducible depositions are facilitated.

sted, utgiver, år, opplag, sider
2007. Vol. 23, nr 3, s. 1171-1177
Emneord [en]
Contact angle; Deposition; Finite element method; Gravitational effects; Mathematical models; Navier Stokes equations; Surface tension; Cahn Hilliard equations; Liquid mediums; Microdroplet deposition; Pressure pulses; Fluid dynamics; article; mathematical computing; particle size; reproducibility; solution and solubility; surface tension; technique; wettability; Methods; Numerical Analysis, Computer-Assisted; Particle Size; Reproducibility of Results; Solutions; Surface Tension; Wettability
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-7213DOI: 10.1021/la0626712ISI: 000243684100035PubMedID: 17241029Scopus ID: 2-s2.0-33847175859OAI: oai:DiVA.org:kth-7213DiVA, id: diva2:12154
Merknad
QC 20100823Tilgjengelig fra: 2007-05-29 Laget: 2007-05-29 Sist oppdatert: 2017-12-14bibliografisk kontrollert
Inngår i avhandling
1. Diffuse-Interface Simulations of Capillary Phenomena
Åpne denne publikasjonen i ny fane eller vindu >>Diffuse-Interface Simulations of Capillary Phenomena
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2007. s. ix, 34
Serie
Trita-MEK, ISSN 0348-467X ; 2007:05
Emneord
capillary-driven flows, wetting, Cahn-Hilliard/Navier-Stokes system, multicomponent and multiphase flows, parallel adaptive computing
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4402 (URN)978-91-7178-718-7 (ISBN)
Disputas
2007-06-08, Sal F2, KTH, Lindstedtsvägen 26, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad
QC 20100823Tilgjengelig fra: 2007-05-29 Laget: 2007-05-29 Sist oppdatert: 2010-08-23bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fulltekstPubMedScopusACS Publications

Personposter BETA

Villanueva, WalterAmberg, Gustav

Søk i DiVA

Av forfatter/redaktør
Villanueva, WalterSjödahl, JohanStjernström, MårtenRoeraade, JohanAmberg, Gustav
Av organisasjonen
I samme tidsskrift
Langmuir

Søk utenfor DiVA

GoogleGoogle Scholar

doi
pubmed
urn-nbn

Altmetric

doi
pubmed
urn-nbn
Totalt: 138 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf