Suppression of turbulent diffusion on the water surface by viscoelastic nano layer etc15 Tracking Number 77Presentation: Session: Multiphase and non-Newtonian flows 2 Room: Room D Session start: 10:30 Thu 27 Aug 2015 Michael Shats Michael.Shats@anu.edu.au Affifliation: Australian National University Nicolas Francois nicolasfrancois2002@yahoo.fr Affifliation: Australian National University Hua Xia Hua.Xia@anu.edu.au Affifliation: Australian National University Horst Punzmann Horst.Punzmann@anu.edu.au Affifliation: Australian National University Topics: - Transport and mixing, - Turbulence in multiphase and non-Newtonian flows, - Lagrangian aspects of turbulence Abstract: We study effects of thin (10 nm) layers of adsorbed proteins on the water surface hydrodynamics. We show that extremely small concentrations of protein (less than 1 ppm) form strong viscoelastic layer at the water-air interface. This layer greatly reduces single particle dispersion on the surface perturbed by Faraday waves and turns disordered surface waves into a square stationary oscillating crystal. The viscoelastic film is destroyed by minute addition of surfactant which leads to the recovery of the horizontal mobility of fluid particles and the restoration of the Faraday wave driven turbulence. |