2015 Annual Meeting of The Institute of Electrostatics JapanTokyo Metropolitan University
September 24-25, 2015

25pA-1
September 25th (Fri.), <14:00-15:15>
Room 1

Charging methods to create uniform surface charge
distributions with wide potential range
A. OhsawaJNIOSH

Abstract:
We have investigated corona charging methods using corona needle
arrays or a corona triode for the creation of a uniform surface charge
distributions with wide potential range on insulating films in contact with agrounded plate. Two types of corona needle arrays were used. In the triodecharger, we sought optimum conditions of the separation between the grid andthe film, the way of the electrical treatment of the grid, such as isolated,grounded with a resistor from 30 MΩ to 1000 MΩ, with voltage application andthe corona discharge of 7 wires of 0.1 mm or 0.05 mm driving at constantvoltage or current modes. Consequently, it was found that a triode charging
system with corona wires of 0.05 mm in diameter and a grid electrode at awanted surface potential with a grounded resistor can create the uniform charge
distributions on the films2015 Annual Meeting of The Institute of Electrostatics JapanTokyo Metropolitan University
September 24-25, 2015

25pA-2September 25th (Fri.), <14:00-15:15>
Room 1

Numerical Simulation of Behavior of Tumor Cell in Three
Dimensional Dielectrophoretic Device
KENTA Sato
Tokyo Metropolitan University

Abstract:
Effective separation and condensation processes are essential for
precise detection of circulating tumor cells in early diagnosis of cancer. In thisstudy, we proposed a dielectrophoretic device with micro pillar electrodes as cell
separator. Also, we simulated the spatio-temporal behavior of model cells on thebasis of microfluidics and electrokinetics. The particle trajectory in a flow
direction was changed by negative dielectrophoretic force generated between
the pillars. This result suggests the tumor cells can be purified from real blood
under adequate electrical condition.

2015 Annual Meeting of The Institute of Electrostatics JapanTokyo Metropolitan University
September 24-25, 2015

25pA-3September 25th (Fri.), <14:00-15:15>
Room 1

Control of Dc Partial Discharge Development Creeping onCharged Insulating Film Surface in Air
Yoshiaki YAMANO
faculty of Education, Chiba UniversityAbstract:
The development of surface discharge on charged insulating film in air(one kind of ESD) was controlled by superimposing the normal component ofelectric field on the charged film surface. The film used was PET of 50 mm thick.
The surface was charged up to ±1 kV in maximum with corona discharges. The
longest air gap between HV electrode tip of metal and the charged film surface
was 1.5 mm. The results suggest that the control of discharge development oncharged surface may be possible if the additional HV electrode is applied toincrease the normal electric field component on the film surface.

2015 Annual Meeting of The Institute of Electrostatics JapanTokyo Metropolitan University
September 24-25, 2015

25pA-4September 25th (Fri.), <14:00-15:15>
Room 1A new method for meauring elctric field in air by a charged
dropletTakashi Sato
Hokkaido University of Science

Abstract:
A quadrapole electrole which is constitute with two pair of wire electrodewas used. Charged droplet is held in the central area of quadrupole electrode byhigh frequency electric field. If additional electric field is applied this systemcharged droplet is affected by it and will move or vibrate by external field. We
tried to measure the electric field strength in air from the movement of droplet byD.C. electric field and the vibration amplitude by A.C. electric field.

2015 Annual Meeting of The Institute of Electrostatics JapanTokyo Metropolitan University
September 24-25, 2015

25pA-5September 25th (Fri.), <14:00-15:15>
Room 1

Effect of Corona Discharge on EHD Spray
Hyun-Ha KIM
AISTAbstract:
The effect of corona discharge on the electrohydrodynamic (EHD) spray
was studied for both polarities of negative and positive DC voltage. Various
spray modes were visualized using a high-speed camera. The time-resolved
images provided some information on the different elongation pattern according
to the polarity. Typical onset streamers in air under positive polarity had minimal
influence on the spray mode because they were found to be separated in timeand space from the water meniscus. In contrast to the stable glow under positive
polarity, many current pulses (Trichel pulse) were observed in the negative EHD
spray. From the combined analysis of the corona discharges, one may conclude
that the different properties of the coronas were associated with the spraypatterns in both air and pure CO2 environment.