�� Corona PhenomenonCorona Phenomenon

�� CorotronCorotron DescriptionDescription

�� Electrical Potential DistributionElectrical Potential Distribution

�� Charge Density DistributionCharge Density Distribution

�� Flow Field ResultsFlow Field Results

�� ConclusionsConclusions

Lateral viewLateral view

Side viewSide view

�� Electrical quantitiesElectrical quantities

�� Amount of surface charge (voltage) on the substrateAmount of surface charge (voltage) on the substrate

�� Flow field calculationsFlow field calculations

�� Contamination analysisContamination analysis

�� Environmental concernsEnvironmental concerns

+Cavity Cavity

flowflow

Ion Ion

transportationtransportation

(corona wind) (corona wind)

Inlet Exit

X(cm)

Vo

lta

ge

(Vo

ts)

0 0.5 1 1.5 20

100

200

300

400

500

600

Substrate

Voltage=4500 VoltsVoltage=4500 Volts Voltage=6000 VoltsVoltage=6000 Volts Speed =0.25 Speed =0.25 m/sm/s

Voltage=4500 VoltsVoltage=4500 Volts Voltage=6000 VoltsVoltage=6000 Volts Speed =0.25 Speed =0.25 m/sm/s

Voltage=4500 VoltsVoltage=4500 Volts

Voltage=6000 VoltsVoltage=6000 Volts

Speed=0.25 Speed=0.25 m/sm/s

X(mm)

Vo

lta

ge

(Vo

lt)

0 10 20 30 400

200

400

600

800

1000

Wire voltag=4500 Volt, Photoreceptor speed=0.5 m/s, Gap=5.3 mm

Wire voltage=6000 Volt, Photoreceptor speed=0.5 m/s, Gap=5.3 mm

Wire voltage=6000 Volt, Photoreceptor speed=0.25 m/s, Gap=5.3 mmWire voltage=6000 Volt, Photoreceptor speed=0.25 m/s, Gap=2 mm

V=6000 Volt

V=4500 VoltU=0.5 m/s

U=0.25 m/s

d=5.3 mm

d=2 mm

�� Numerical simulations ofNumerical simulations of 3D 3D

ElectrohydrodynamicsElectrohydrodynamics in in corotrons corotrons

were performed. were performed.

�� Charging of substrate under various Charging of substrate under various

conditions is conditions is analyzed.analyzed.

�� The computational model provides a The computational model provides a

tool for optimization of design of tool for optimization of design of

corotrons. corotrons.