Displacement of a bubble located at a fluid-viscoelastic medium interface

Area of Science:

• Fluid dynamics
• Acoustic radiation force
• Viscoelasticity

Background:

• Understanding bubble dynamics at interfaces is crucial in various scientific and engineering fields.
• Acoustic radiation force plays a significant role in manipulating microbubbles.
• Existing models often simplify the complex behavior of viscoelastic media.

Purpose of the Study:

• To develop and present a model for estimating bubble displacement at a fluid-viscoelastic interface.
• To investigate the influence of viscoelastic medium properties (stiffness, viscosity) and acoustic excitation parameters (amplitude, duration) on bubble displacement.
• To analyze the relationship between bubble displacement and these parameters.

Main Methods:

• Extending a pre-existing model for spherical objects in bulk materials to accommodate interface phenomena.
• Simulating bubble behavior under acoustic radiation force using the developed model.
• Analyzing the effects of varying viscoelastic properties and excitation force parameters.

Main Results:

• Bubble displacement exhibits a nonlinear relationship with excitation duration and medium viscosity.
• Increased medium viscosity and decreased medium stiffness lead to longer times to reach a steady state.
• The model quantifies the impact of material properties and force parameters on bubble movement.

Conclusions:

• The proposed model provides a framework for predicting bubble displacement in viscoelastic media.
• Viscoelastic properties significantly influence bubble dynamics under acoustic forces.
• Further research can utilize this model for applications involving microbubble manipulation in complex fluids.