Hydrodynamic interaction and coalescence of two droplets under large step shear strains

Hydrodynamic Interaction Model for Two Droplets under Large Step Shear Strains

“…for one recovery process is roughly independent of initial distance provided that the initial distance is less than a certain value. These three agreements between the model predictions and the experimental results 25) strongly indicate that the behaviors of the two droplets after application of large step shear strains are dominated by the hydrodynamic interaction.…”

“…4 (d)), the configuration of the rigid spheres obviously exhibits sigmoidal shape. For comparison, we also calculated time dependence of shape for the two arrays using the same q as Figs 25) and are not found during recovery of an isolated PIB droplet in PDMS matrix. 30) The calculated results …”

“…Our experimental results indicate that the stress is affected by droplet size distribution and/or interaction between adjacent droplets. 20,23) Concerning the interaction between adjacent droplets, our recent observation 24,25) revealed that attractive interaction acts on two polyisobutylene (PIB) droplets in polydimethylsiloxane (PDMS) matrix on the same shear plane during the shape recovery of the droplets after application of large step shear strains: The droplets approach by each strain. We have shown that the origin of the interaction is hydrodynamic interaction between the droplets based on a simple model using the hydrodynamic interaction tensor.…”

“…The flow field around the droplets implies approach of the droplets during shape recovery, which explains the experimental results well. 25) In the present study, details of the above model which explains the origin of the approach of the droplets are described and the model is evaluated more crucially by comparing with our experimental results. 25) To do this, we will clarify the origin and effects of the interaction between adjacent droplets in polymer blends.…”

Estudo do comportamento reológico da mistura polimérica PMMA/PS compatibilizada ou não.

“…Figura 53: Evolução de morfologia de duas gotas após ensaio de relaxação de tensão [77] : a) antes da aplicação da deformação, b) t=0 s, c) t=45 s, d) t=90 s, e) t=180s, f) 360s, g)1.200s. Vista lateral…”