On the Complex Flow Dynamics of Shear Thickening Fluids Entry Flows

Area of Science:

• Materials Science
• Fluid Dynamics
• Nanotechnology

Background:

• Shear thickening fluids (STFs) are utilized in energy-dissipating systems like shock absorbers.
• Rheinforce technology embeds STF-filled microfluidic channels in composites for customized energy dissipation.
• Optimizing microchannel shape controls pressure drop and energy dissipation.

Purpose of the Study:

• To analyze the influence of STF three-region viscosity on entry flow in axisymmetric pipes.
• To provide a more accurate model for STF behavior compared to the power-law model.
• To enhance the design of energy-dissipating composites using Rheinforce technology.

Main Methods:

• Performed two-dimensional numerical simulations.
• Investigated four STFs with fumed silica nanoparticles in polypropylene glycol at varying concentrations (7.5-20 wt%).
• Analyzed the fluid flow at the microchannel entry region, considering the complete STF viscosity curve.

Main Results:

• The study provides the first analysis of STF three-region viscosity effects on entry flow.
• Numerical simulations offer insights into pressure drop and energy dissipation control.
• The findings are crucial for accurate design of STF-based energy dissipative systems.

Conclusions:

• Accurate modeling of STF viscosity is essential for optimizing energy dissipation in microfluidic devices.
• Understanding entry flow dynamics improves the design of advanced damping and shock absorption systems.
• This research advances the application of STFs in engineering through improved numerical simulation.