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Drop profile analysis tensiometry under highly dynamic conditions

Karbaschi, M ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1016/j.colsurfa.2012.04.027
  3. Publisher: 2012
  4. Abstract:
  5. Profile analysis tensiometry (PAT) is presently the most frequently used technique for measuring surface tensions of liquids. The basis of this methodology is however an equilibrium force balance as given by the Gauss-Laplace equation. Therefore, its application under dynamic conditions, i.e. for growing drops or bubbles, is questionable. We discuss the limits of the applicability of PAT under dynamic conditions by using a growing drop configuration equipped with a high speed video camera. The systems studied are the water/air and water/hexane interface. The obtained "dynamic" drop profiles are analyzed by fitting the classical Gauss-Laplace equation. The results are additionally compared with experimental data obtained from capillary pressure tensiometry. The analysis allows defining three different regions related to respective drop expansion rates
  6. Keywords:
  7. Capillary pressure technique ; Drop profile analysis ; Dynamic surface tension measurements ; Fluid dynamics of growing drop ; Gauss-Laplace equation ; Capillary pressure tensiometry ; Drop configurations ; Drop profile ; Dynamic condition ; Dynamic surface tension measurement ; Equilibrium forces ; Expansion rate ; High speed video cameras ; Profile analysis tensiometry ; Capillarity ; Capillary tubes ; Gaussian distribution ; Integrodifferential equations ; Laplace equation ; Surface tension ; Drops ; hexane ; water ; air ; camera ; capillary pressure ; liquid ; pressure measurement ; priority journal
  8. Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects ; Volume 413 , 2012 , Pages 292-297 ; 09277757 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0927775712002725