Numerical and experimental investigation on fibre dispersion in coaxial jets

• Applicant: Professor Dr. Berend van Wachem
• Subject Area: Fluid Mechanics ; Mechanical Process Engineering
• Term: since 2025
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 560947439

This proposal aims to advance the understanding of fluid-solid multiphase flows by focusing on the behaviour of fibre-like particles in spatially developing turbulent flows, specifically coaxial jet flows. While progress has been made in studying flows with spherical particles, the dynamics of non-spherical particles, such as fibres, in realistic conditions remain poorly understood. Fibre-like particles add complexity due to their elongated shape and orientation-dependent interactions with turbulent fluids. The primary objective is to develop a numerical framework to accurately model the hydrodynamic forces on elongated particles in spatially developing turbulent flows. To achieve this, the proposal combines high-fidelity direct numerical simulations with 3D experimental measurements, using techniques such as particle image velocimetry and two view digital holography. These approaches enable model validation against experimental data, capturing the instantaneous interactions between fibres and the flow field across different fibre lengths and fluid velocity ratios. Key investigations include the effects of fibre inertia and length on dispersion in coaxial jet flows, as these parameters influence interactions with wake or shear vortices. By bridging the gap between experiments and modelling, the research aims to establish a framework for predicting fibre dynamics in realistic multiphase flows, enhancing the design and optimization of industrial processes involving non-spherical particles.

• DFG Programme: Research Grants
• International Connection: Israel
• Partner Organisation: The Israel Science Foundation
• Cooperation Partner: Professor René van Hout, Ph.D.