Impact of Processing Parameters on Contactless Emulsification via Corona Discharge

Area of Science:

• Materials Science
• Chemical Engineering
• Physics

Background:

• Traditional emulsification methods often require physical contact and significant energy input.
• Developing energy-efficient and contactless methods for emulsion formation is crucial for various industrial applications.

Purpose of the Study:

• To introduce and characterize a novel contactless emulsification method using corona discharge.
• To investigate the influence of electric field parameters and oil viscosity on emulsion characteristics.
• To evaluate the energy efficiency of the proposed method compared to conventional techniques.

Main Methods:

• A pin-to-plate electrode configuration was employed to generate a non-uniform electric field, inducing corona discharge.
• The study systematically varied oil viscosity and electric field parameters (AC/DC voltage, frequency) to control emulsion formation.
• Emulsification power consumption was quantified and compared against established methods.

Main Results:

• The corona discharge facilitated simultaneous electrohydrodynamic pumping of silicone oil and electroconvection of water droplets, enabling continuous water-in-oil (W/O) emulsion formation.
• While direct current (DC) fields produced uniform emulsions, alternating current (AC) fields demonstrated lower power consumption and readily available operation.
• The method proved effective for facile, contactless, and energy-efficient W/O emulsion generation.

Conclusions:

• Corona discharge offers a promising contactless and energy-efficient approach for continuous W/O emulsion production.
• Alternating current (AC) electric fields present a practical and power-saving alternative for this emulsification technique.
• This method holds potential for scalable and sustainable emulsion manufacturing.