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Enhanced stability of electrohydrodynamic jets through gas ionization
Sibel Korkut1, Dudley A Saville, Ilhan A Aksay
1Department of Chemical Engineering, Princeton University, Princeton, NJ 08544-5263, USA.
Physical Review Letters
|February 1, 2008
Summary
Gas ionization explains why electrohydrodynamic jet instability predictions are too high. This discovery enables stable jets for precise nano- to microscale printing applications.
Area of Science:
- Physics
- Fluid Dynamics
- Electrohydrodynamics
Background:
- Theoretical models for electrohydrodynamic (EHD) jet instability growth rates often overestimate experimental results.
- The discrepancy is linked to the influence of the surrounding gas environment on the EHD jet.
Purpose of the Study:
- To investigate the role of gas ionization in the observed overestimation of EHD jet instability growth rates.
- To understand how gas ionization affects the surface charge density of EHD jets.
- To identify conditions leading to stable EHD jets for advanced printing applications.
Main Methods:
- Analysis of theoretical predictions versus experimental values for nonaxisymmetric instability growth rates.
- Investigating the impact of gas ionization on the surface charge density of EHD jets.
- Examining the relationship between electrode separation and jet stability.
Main Results:
- Gas ionization in the surrounding medium significantly alters the surface charge density of EHD jets.
- A critical electrode separation was identified below which gas ionization causes a sharp decrease in instability growth rate.
- This phenomenon leads to the formation of highly stable EHD jets.
Conclusions:
- Gas ionization is the key factor reconciling theoretical predictions with experimental observations of EHD jet instability.
- Controlling gas ionization through electrode separation allows for the generation of stable EHD jets.
- These stable jets are suitable for high-precision nano- to microscale printing technologies.
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