Delay of disorder by diluted polymersA. V. Kityk1, 2 and C. Wagner1
1 Experimentalphysik, Universität des Saarlandes - 66041 Saarbrücken, Germany
2 Institute for Computer Science, Technical University of Czestochowa Armii Krajowej 17, PL 42-200 Czestochowa, Poland
received 25 January 2006; accepted in final form 9 June 2006
published online 28 June 2006
We study the effect of diluted flexible polymers on a parametrically driven, disordered capillary wave state. The primary pattern after the first bifurcation from the flat interface is given by squares. With increasing driving strength we observe a melting of the square pattern. Angular and radial correlations are lost and the wave spectrum beyond the basic wave number consists of a continuum only. The addition of a small amount of polymers shifts the disorder transition to higher driving strengths, without affecting the critical acceleration of the first bifurcation. Simultaneously the short wave length -high frequency- fluctuations are suppressed. The effect can be explained only by taking the high elongational viscosity of the polymer solution into account.
47.27.Cn - Transition to turbulence.
47.54.-r - Pattern selection; pattern formation.
47.35.Pq - Capillary waves.
© EDP Sciences 2006