Species separation of a binary mixture under acoustic streaming

Area of Science:

• Fluid dynamics
• Acoustics
• Chemical engineering

Background:

• Species separation in binary fluids is crucial for industrial processes.
• Ultrasonic waves offer a non-invasive method for fluid manipulation.
• Understanding fluid behavior under acoustic and thermal gradients is essential.

Purpose of the Study:

• To analytically and numerically investigate ultrasonic wave effects on species separation.
• To determine temperature, mass fraction, and velocity fields in a binary fluid cavity.
• To analyze flow patterns and their dependence on physical parameters.

Main Methods:

• Analytical and numerical simulations of fluid flow.
• Application of ultrasonic waves to a binary fluid (water-ethanol mixture).
• Differential heating of horizontal walls and acoustic streaming generation.

Main Results:

• Identified unicellular and three-cell counter-rotating flow patterns.
• Determined the conditions for each flow type based on physical parameters.
• Derived an equation for mass fraction gradient and species separation.
• Studied the variation of mass fraction gradient with acoustic and temperature parameters.

Conclusions:

• Ultrasonic waves can induce significant species separation in binary fluids.
• Flow structure is controllable via acoustic and thermal parameters.
• The study provides a framework for optimizing separation processes using acoustics.