Surface wettability through asymtotic contact angle

Saeid Vafaei, Dongsheng Wen, Ganapathiraman Ramanath, Theodorian Borca-Tasciuc

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

The purpose of this investigation is to find a unique and accurate criterion to measure surface wettability. The asymptotic contact angle (droplet contact angle in no gravity condition), which is independent of droplet size, is used to identify the surface wettability in this work. The asymptotic contact angle is calculated by equating the normal component of interfacial force on an axisymmetric droplet and spherical droplet. The effect of 2.5 nm bismuth telluride nanoparticles on surface wettability is measured and evaluated by asymptotic contact angles as a sample. This paper also studies the effects of nanoparticles on solid, gas and liquid interactions at the triple line as well as the gas-liquid surface tension of aqueous solutions of 2.5 nm bismuth telluride nanoparticles functionalized with thioglycolic acid. Experimental measurements of nanofluid droplet shapes show that the contact angle strongly depends on nanoparticle concentrations. Fitting the droplet shape with predictions of the Laplace-Young equation, the nanofluid gas-liquid surface tension is determined.

Original languageEnglish
Title of host publicationProceedings of the ASME Fluids Engineering Division Summer Conference 2009, FEDSM2009
Pages889-894
Number of pages6
EditionPART B
DOIs
StatePublished - 2009
Externally publishedYes
Event2009 ASME Fluids Engineering Division Summer Conference, FEDSM2009 - Vail, CO, United States
Duration: 2 Aug 20096 Aug 2009

Publication series

NameProceedings of the ASME Fluids Engineering Division Summer Conference 2009, FEDSM2009
NumberPART B
Volume1

Conference

Conference2009 ASME Fluids Engineering Division Summer Conference, FEDSM2009
Country/TerritoryUnited States
CityVail, CO
Period2/08/096/08/09

Keywords

  • Asymptotic contact angle
  • Boiling
  • Contact angle
  • Critical heat flux
  • Nanofluid
  • Nanoparticle
  • Surface wettability

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