Title :
Dynamics of electrically stressed water drops on insulating surfaces
Author :
Schutte, T. ; Hornfeldt, S.
Author_Institution :
ABB Corp. Res., Vasteras
Abstract :
A single drop on an insulating surface stressed by an electric field parallel to it has been studied for a range of drop volumes for different insulating materials, under both DC and AC stress. The results show that on hydrophobic surfaces, the electrohydrodynamic effects are quantitatively the same as for a free drop. The less hydrophobic the surface, the larger is the deviation from free drop behavior. For DC, the drop elongation occurs somewhat stepwise due to contact angle hysteresis. For AC, the elongation is smooth and flashover due to instability occurs at a lower field strength. When the AC frequency is increased above the power frequency, the flashover voltage increases. Vibration modes for drops on hydrophobic surfaces are very similar to free drop modes
Keywords :
electrohydrodynamics; flashover; insulating materials; AC frequency; AC stress; DC stress; contact angle hysteresis; drop elongation; drop volumes; electric field; electrically stressed water drops; electrohydrodynamic effects; field strength; flashover; flashover voltage; free drop behavior; hydrophobic surfaces; insulating materials; insulating surfaces; power frequency; vibration modes; Dielectrics and electrical insulation; Electric fields; Electrodes; Electrohydrodynamics; Flashover; Frequency; Glass; Stress; Surface tension; Voltage;
Conference_Titel :
Electrical Insulation, 1990., Conference Record of the 1990 IEEE International Symposium on
Conference_Location :
Toronto, Ont.
DOI :
10.1109/ELINSL.1990.109741