Amontons-Coulomb-like slip dynamics in acousto-microfluidics

Area of Science:

• Biomedical Engineering
• Fluid Dynamics
• Acoustics

Background:

• Acousto-microfluidics utilizes acoustic waves for particle and fluid manipulation in biomedical applications.
• Efficient acoustic energy transmission to fluids is crucial for acousto-microfluidic devices.
• Fluid slip at the liquid-solid interface can significantly impede acoustic transmission but has been overlooked.

Purpose of the Study:

• To investigate the phenomenon of fluid slip at the liquid-solid interface in acousto-microfluidics.
• To establish an analogy between slip dynamics and Amontons-Coulomb laws of dry friction.
• To improve the design and predictability of acousto-microfluidic technologies.

Main Methods:

• Analysis of slip dynamics at the liquid-solid interface.
• Comparison of pressure-shear stress conditions to the cone of friction in dry friction.
• Modeling acousto-microfluidic systems considering interface slip.

Main Results:

• Fluid slip dynamics in acousto-microfluidics are analogous to Amontons-Coulomb laws for dry friction.
• Identified distinct slip and no-slip regions based on pressure-shear stress conditions.
• Demonstrated a relationship between local fluid pressure and shear stress at the interface.

Conclusions:

• Understanding slip dynamics is critical for optimizing acousto-microfluidic device performance.
• The analogy to friction provides a new framework for designing these systems.
• Improved understanding of slip will enhance the reliability and expand applications in biology and medicine.