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Filament Stabilisation in Free-surface Flows of Complex Fluids KU Leuven
This doctoral dissertation discusses the capillary-driven breakup of various low viscous non-Newtonian liquid filaments. A liquid filament is destabilised by surface tension that drives the free surface to minimise its surface energy by forming spherical droplets. These surface tension-driven flows are encountered in the form of liquid jets, dripping faucets and stretched filaments between two solid surfaces. The thinning dynamics during this ...
OrthoChirp: A fast spectro-mechanical probe for monitoring transient microstructural evolution of complex fluids during shear KU Leuven
Shear-induced microstructural changes are observed ubiquitously in materials as diverse as hydrogels, or drilling fluids, as well as many consumer products. Superposition rheometry, consisting of superimposing Small Amplitude Oscillatory Shear (SAOS) on top of a constant rate unidirectional shear has often been used to gain insight into these shear-induced changes. Orthogonal superposition (OSP), in which the two modes of deformation are ...
Structure and rheology of complex fluids KU Leuven
Contents 1 Introduction 2 2 Rheological Phenomena 3 2.1 Viscoelasticity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Non-Newtonian behaviour . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.3 Elastic effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.4 Elongational viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Linear viscoelasticity 6 3.1 Creep ...
Confocal Depolarized Dynamic Light Scattering: a Novel Technique for the Characterization of Nanoparticles in Complex Fluids Vrije Universiteit Brussel
We present Confocal Depolarized Dynamic Light Scattering as a novel optical method for the characterization of nanoparticles in solution. The method is validated in conditions of biological interest where traditional optical methods fail. As a test case we study highly concentrated, strongly scattering, samples of thermosensitive core-shell particles constituted by a spherical PMMA core surrounded by a PNIPAM network and, follow the kinetics of ...
Complex windmill transformation producing new purely magnetic fluids Ghent University
Fluorescence single particle tracking for the characterization of submicron protein aggregates in biological fluids and complex formulations Ghent University
Processing of Complex Fluids: Capillary Break-up and Network Breakdown KU Leuven
This PhD dissertation focuses on gathering more insights in fundamental aspects related to high-speed, small volume dosing of complex fluids, as encountered during the filling of mono-dose pouches of highly concentrated detergent. In such a dosing process, two characteristic flows are observed: shear flow in the tubing and nozzle, and a surface tension driven extensional flows leading to jet break-up. Compared to a regular bottle-filling ...
Capillary Break-up of Complex Fluids: A Road Towards Better Understanding KU Leuven
The present PhD thesis focusses on exploring current open-ended issues in capillary break-up rheometry. Exploiting the natural phenomenon of capillarity instability, capillary break-up rheometry represents a very powerful technique to extract material information in free-surface, uniaxial extensional flows, which are of the utmost importance in understanding and controlling processes and applications involving the formation of liquid ligaments, ...
Dispensing of Rheologically Complex Fluids: the Map of Misery KU Leuven
Rheological effects may complicate the dispensing of complex fluids, when compared to their Newtonian counterparts. In this work, fluids with tailored rheological properties have been studied using high-speed video-microscopy. The level of viscosity, the degree of shear thinning, and the elasticity have been varied independently. At low-flow rates, droplets are formed that pinch off. The drop volumes, breakup mechanisms, and times have been ...