Rheology and sedimentation of dense suspensions in confined geometries
Insights from particle-resolved direct numerical simulations
W. Peerbooms (TU Delft - Mechanical Engineering)
W.P. Breugem – Promotor (TU Delft - Mechanical Engineering)
L. Botto – Promotor (TU Delft - Mechanical Engineering)
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Abstract
Solid-liquid suspensions are abundant in our daily lives, in nature, and in industry. The industrial application that we focus on in this work is extrusion-based 3D printing, where suspensions can be used to print for instance: food, metal, or energetic materials. When printing energetic materials, performance requirements dictate that the solid content should be as high as possible. This high solid load creates a challenge to maintain flowable conditions. Additionally, this high volume fraction can create problems with blocking of the nozzle if a contraction is used at the end. Next to the flowability, the homogeneity of the suspension plays an important role, where shear stresses and gravity tend to cause an inhomogeneous microstructure. These aspects relate to the suspension rheology, i.e., the response of the suspension to imposed stress or strain. A good understanding of the rheology is critical to be able to design, optimize, and use printing systems and compositions for energetic materials. The goal of this research is to gain more insight into and to improve modeling of the rheology of dense suspensions for the application in UV-assisted Liquid Deposition Modeling...