Thin liquid films arise in many technological applications and biological phenomena. They also present a fascinating object of study, because rich interplay between capillarity, hydrodynamics, interfacial transport phenomena rheology, as well the effects interaction forces when thin down to molecular thicknesses. Recent advances experimental techniques have given further insights variety physical phenomena, which can occur. These are briefly reviewed. How these be utilised is illustrated by...

We apply laser light to induce the asymmetric heating of Janus colloids adsorbed at water-oil interfaces and realize active micrometric "Marangoni surfers." The coupling temperature surfactant concentration gradients generates Marangoni stresses leading self-propulsion. Particle velocities span 4 orders magnitude, from microns/s cm/s, depending on power concentration. Experiments are rationalized by finite elements simulations, defining different propulsion regimes relative magnitude thermal...

Fluid–fluid interfaces, laden with polymers, particles or other surface-active moieties, often show a rheologically complex response to deformations, in particular when strong lateral interactions are present between these moieties. The of the interface can then no longer be described by an isotropic surface tension alone. These "structured" soft-matter interfaces found many industrial applications, ranging from foods, cosmetics and pharmaceuticals, oil recovery. Also biomedical applications...

In this study, we experimentally investigate the fiber orientation kinetics and rheology of fiber-filled polymer melts in shear flow. A novel setup is designed with custom-built bottom top geometries that are mounted on a conventional rotational rheometer. Shear flow between parallel sliding plates applied by vertical movement geometry. The axial force measurement data rheometer used to determine stress growth coefficient. measured situ using small angle light scattering. We consider...

Hamiltonian neural networks (HNNs) represent a promising class of physics-informed deep learning methods that utilize theory as foundational knowledge within networks. However, their direct application to engineering systems is often challenged by practical issues, including the presence external inputs, dissipation, and noisy measurements. This paper introduces novel framework enhances capabilities HNNs address these real-life factors. We integrate port-Hamiltonian into network structure,...

The demand for fiber-filled polymers has witnessed a significant upswing in recent years. A comprehensive understanding of the local fiber orientation is imperative to accurately predict mechanical properties products. In this study, we experimentally investigated kinetics uniaxial extensional flows. For this, equipped rheometer with Sentmanat measurement device and an optical train that allows us measure situ during extension using small angle light scattering. We experimental system glass...

We investigate the flow of viscous interfaces carrying an insoluble surface active material, using numerical methods to shed light on complex interplay between Marangoni stresses, compressibility, and shear dilatational viscosities. find quantitative relations drag a particle interfacial properties as they are required in microrheology, i.e., going beyond asymptotic limits. To this end, we move spherical probe at constant tangential velocity, symmetrically immersed either incompressible or...

During processing of fiber composites, the fiber-induced stresses influence local flow fields, which, in turn, stress distribution and orientation. Therefore, it is crucial to be able predict rheology fiber-filled polymer composites. In this study, we investigate orientation kinetics rheological properties composites uniaxial extensional by comparing direct numerical finite element simulations experimental results from our previous study [Egelmeers et al., “In-situ investigation during...

In the present work, a polymeric transient viscoelastic network is used as model system to investigate several fundamentals of interfacial viscoelasticity and nonlinear behavior, in simple shear, compression, for mixed deformations. A supramolecular polymer bilayer, characterized by long but finite relaxation times, created at water-air interface using layer-by-layer assembly method. The possibility studying individual layers starting from an unstrained reference state enabled independent...

Simulations of rigid particles suspended in two-phase shear flow are presented, where one the suspending fluids is viscoelastic, whereas other Newtonian. The Cahn-Hilliard diffuse-interface model employed for fluid-fluid interface, which can naturally describe interactions between particle and interface (e.g., adsorption). It shown that migrate across streamlines base flow, due to surface tension a difference normal stresses two fluids. initially located viscoelastic fluid, its migration...

Bubble suspensions can be found in many different fields and studying their rheology is crucial order to improve manufacturing processes. When bubbles are added a liquid, the magnitude of viscosity changes behavior material modified, giving it viscoelastic properties. For purpose this work, suspended considered monodisperse. It assumed that Brownian motion inertia neglected fluid matrix Newtonian incompressible. The suspension subject an oscillatory strain while remaining linear regime....

In this work, a systematic investigation of the migration sedimenting particles in viscoelastic Couette flow is presented, using finite element 3D simulations. To end, novel computational approach which allows us to simulate periodic configuration rigid spherical accurately and efficiently. study different contributions particle migration, we first investigate near inner wall, without an externally-imposed flow, followed by non-sedimenting flow. Then, both flows are combined, i.e., with was...

The calibration of rheological parameters in the modeling complex flows non-Newtonian fluids can be a daunting task. In this paper we demonstrate how framework Uncertainty Quantification (UQ) used to improve predictive capabilities models such flow scenarios. For demonstration, consider squeeze generalized Newtonian fluids. To systematically study uncertainties, have developed tailored setup, which perform experiments with glycerol and PVP solution. mimic these experiments, three-region...

Depending on the application, one needs to either stabilize or destabilize interfacial properties of an emulsion. An aspect dynamics that governs stability emulsions in general is drainage time film formed when two drops collide. In this work, we study effect viscoelasticity matrix fluid has Newtonian perform a head-on collision under applied macroscopic extensional rate. For modeling viscoelastic material, Giesekus model chosen. A cylindrical coordinate system with imposed axisymmetry and...

Abstract