Abstract
The Shear Thickening Fluid (STF) is a dilatant material, which displays non-Newtonian characteristics in its unique ability to transit from a low viscosity fluid to a high viscosity fluid. The research performed investigates the STF behavior by modeling and simulation of the interaction between the base flow and embedded rigid particles when subjected to shear stress. The model considered the Lagrangian description of the rigid particles and the Eulerian description of fluid flow. The numerical analysis investigated key parameters such as applied flow acceleration, particle distribution and arrangement, volume concentration of particles, particle size, shape and their behavior in a Newtonian and non-Newtonian fluid base. The fluid-particle interaction model showed that the arrangement, size, shape and volume concentration of the particles had a significant effect on the behavior of the STF. Although non-conclusive, the addition of particles in non-Newtonian fluids showed a promising trend of improved shear thickening effects at high shear strain rates.
Highlights
Many civil and military structures and systems need to be designed to withstand shock loading
EFFECT OF APPLIED FLOW ACCELERATION Four different shear velocities were applied at the top boundary of the control volume to determine the behavior of the Shear Thickening Fluid (STF)
The study on the applied flow acceleration showed that the model with the boundaries conditions used was able to simulate the shear thickening effect of the STF
Summary
Many civil and military structures and systems need to be designed to withstand shock loading. Different types of energy dissipative materials have been studied in order to mitigate the shock loading. They include multi-composites sandwich panels, ‘soft’ condensed matter such as granular materials or foams [1], and non-Newtonian fluids such as Shear Thickening Fluid (STF). The particles are assumed to be rigid Using this model, the research examines the effects of various discrete parameters associated with rigid particles on shear thickening. The research examines the effects of various discrete parameters associated with rigid particles on shear thickening Such parameters include particle shapes, distributions, volume fractions, sizes, etc. The numerical results and discussion are presented followed by conclusions
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