1. ELECTRO-HYDRODYNAMICS ANALYSIS OF COROTRONS
P. Zamankhan, G. Ahmadi and F-G. Fan
Center for Advanced Materials Processing
Clarkson University, Potsdam, NY
Xerox Corporation, Webster, NY

2. Electrical Potential Distribution Charge Density Distribution
Outline
Corona Phenomenon
Corotron Description
Electrical Potential Distribution
Charge Density Distribution
Flow Field Results
Conclusions

3. Corotron
Lateral view
Side view

4. Corotron over a Moving
Dielectric Substrate

5. Objectives of the Computational Model
Electrical quantities
Amount of surface charge (voltage) on the substrate
Flow field calculations
Contamination analysis
Environmental concerns
Ion transportation
(corona wind)
Cavity flow +

6. Substrate Surface Charge (Voltage) Distribution

7. Electrical Potential Distribution

8. Effect of Wire Voltage, and The Substrate
Speed on Electrical Potential Distribution
Voltage=4500 Volts
Voltage=6000 Volts
Speed =0.25 m/s

9. Charge Density Distribution

10. Charge Density Distribution

11. Effect of Wire Voltage, and The Substrate
Speed on Charge Density Distribution
Voltage=6000 Volts
Speed =0.25 m/s
Voltage=4500 Volts

12. Flow Field Results-Corona Wind
Voltage=4500 Volts

13. Flow Field Results-Corona Wind
Voltage=6000 Volts

14. Flow Field Results-Corona Wind
Speed=0.25 m/s

15. Variation of Substrate Voltage Distribution
V=6000 Volt
V=4500 Volt
U=0.5 m/s
U=0.25 m/s
d=5.3 mm
d=2 mm

16. Charging of substrate under various conditions is analyzed.
Conclusions
Numerical simulations of 3D Electrohydrodynamics in corotrons were performed.
Charging of substrate under various conditions is analyzed.
The computational model provides a tool for optimization of design of corotrons.