Effect of pressure on electrospray characteristics

Area of Science:

• Physics
• Chemical Engineering
• Materials Science

Background:

• Electrospray technology is crucial for various applications, including aerosol generation and materials processing.
• Understanding electrospray behavior under different operating conditions, such as subambient pressure, is essential for optimizing performance.
• Existing models for electric field calculations may require refinement for low-pressure environments.

Purpose of the Study:

• To experimentally investigate the behavior of pulsating electrosprays operating at subambient pressures.
• To determine the pressure limits for stable electrospray operation.
• To establish the relationship between voltage and pressure in this regime and refine electric field calculations.

Main Methods:

• Experimental setup for pulsating electrospray operation at subambient pressures.
• Systematic variation of pressure and voltage to observe electrospray stability.
• Analysis of voltage-pressure data to identify operational limits and scaling relationships.

Main Results:

• Stable pulsating electrospray operation is achievable within a specific pressure domain, limited by the liquid's vapor pressure.
• A logarithmic dependence of the driving voltage on pressure was observed.
• The findings provide an amended scaling relationship for calculating the electric field at the meniscus tip.

Conclusions:

• Subambient pressure operation of pulsating electrosprays is feasible and influenced by vapor pressure.
• The established voltage-pressure relationship offers improved accuracy for electric field calculations in low-pressure electrospray systems.
• This research contributes to a better understanding and control of electrospray dynamics for advanced applications.