2021/05/19 by Carole-Ann Charles, Charles, Carole-Ann, Ameur Louhichi +6
Agricultural and Biological Sciences · Engineering · Materials Science · Physics and Astronomy · #Composite material #Dissipation #Dynamic mechanical analysis #Dynamic modulus #Elasticity (physics) #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Fluid Dynamics and Heat Transfer #Materials science #Mechanics #Moduli #Newtonian fluid #Physics #Plant Surface Properties and Treatments #Polymer #Soft Condensed Matter (cond-mat.soft) #Surface Modification and Superhydrophobicity #Thermodynamics #Viscoelasticity #Viscosity #cond-mat.soft #physics.flu-dyn
paper · pdf · doi:10.48550/arxiv.2105.09244
Accepted for publication in Soft Matter
arxiv created 2021/05/19 · openalex publication_date 2021/05/19 · arxiv updated 2021/05/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We investigate freely expanding viscoelastic sheets. The sheets are produced by the impact of drops on a quartz plate covered with a thin layer of liquid nitrogen that suppresses shear viscous dissipation as a result of the cold Leidenfrost effect. The time evolution of the sheet is simultaneously recorded from top and side views using high-speed cameras. The investigated viscoelastic fluids are Maxwell fluids, which are characterized by low elastic moduli, and relaxation times that vary over almost two orders of magnitude, thus giving access to a large spectrum of viscoelastic and elastocapillary effects. For the purposes of comparison, Newtonian fluids, with viscosity varying over three orders of magnitude, are also investigated. In this study, dmax, the maximal expansion of the sheets, and tmax the time to reach this maximal expansion from the time at impact, are measured as a function of the impact velocity. By using a generalized damped harmonic oscillator model, we rationalize the role of capillarity, bulk elasticity and viscous dissipation in the expansion dynamics of all investigated samples. In the model, the spring constant is a combination of the surface tension and the bulk dynamic elastic modulus. The time-varying damping coefficient is associated to biaxial extensional viscous dissipation and is proportional to the dynamic loss modulus. For all samples, we find that the model reproduces accurately the experimental data for dmax and tmax.