A112 Freezing Initiation of Supercooled Water Drop by Colliding with Electrode for Electric Field in Oil

2010 ◽  
Vol 2010 (0) ◽  
pp. 3-4
Author(s):  
Fumiaki Koita ◽  
Yoshiro Tochitani
Keyword(s):  
Electric Field ◽  
Water Drop ◽  
Supercooled Water

The bursting of soap-bubbles in a uniform electric field

1925 ◽  
Vol 22 (5) ◽  
pp. 728-730 ◽  
Author(s):  
C. T. R. Wilson ◽  
G. I. Taylor
Keyword(s):  
Electric Field ◽  
Water Drop ◽  
The Other ◽  
Uniform Electric Field ◽  
Geometrical Shape ◽  
Soap Bubble ◽  
Charged Drop ◽  
Mathematical Discussion ◽  
Mathematical Expressions ◽  
The Stability

The stability of a charged raindrop has been discussed mathematically by Lord Rayleigh. The case of an uncharged drop in a uniform electric field is perhaps of more meteorological importance but a mathematical discussion of the conditions for stability turns out to be very much more difficult in this case, owing to the fact that the drop ceases to be spherical before it bursts. Moreover it does not seem possible to express its geometrical shape by means of any simple mathematical expressions. On the other hand, by using a soap bubble instead of a water drop it was found possible to carry out experiments under well-defined conditions in this case, whereas experiments with Rayleigh's charged drop would be difficult.

A Contact Line Dynamic Model for a Conducting Water Drop on an Electrowetting Device

2016 ◽  
Vol 20 (3) ◽  
pp. 811-834 ◽  
Author(s):  
Dongdong He ◽  
Huaxiong Huang
Keyword(s):  
Contact Angle ◽  
Electric Field ◽  
Contact Line ◽  
Water Drop ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Apparent Contact Angle ◽  
Two Phase ◽  
Maximum Deformation ◽  
Drop Motion

AbstractThe static shape of drop under electrowetting actuation is well studied and recent electrowetting theory and experiments confirm that the local contact angle (microscopic angle) is unaffected while the apparent contact angle (macroscopic angle) is characterized by the Lippmann-Young equation. On the other hand, the evolution of the drop motion under electrowetting actuation has received less attention. In this paper, we investigate the motion of a conducting water drop on an electrowetting device (EWD) using the level set method. We derive a contact line two-phase flow model under electrowetting actuation using energy dissipation by generalizing an existing contact line model without the electric field. Our model is consistent with the static electrowetting theory as the dynamic contact angle satisfies the static Young's equation under equilibrium conditions. Our steady state results show that the apparent contact angle predicted by our model satisfies the Lippmann-Young's relation. Our numerical results based on the drop maximum deformation agree with experimental observations and static electrowetting theory. Finally, we show that for drop motion our results are not as good due to the difficulty of computing singular electric field accurately. Nonetheless, they provide useful insights and ameaningful first step towards the understanding of the drop dynamics under electrowetting actuation.

The Flashover Phenomena due to Water Drops on Insulating Surface under DC Electric Field

2014 ◽  
Vol 931-932 ◽  
pp. 962-967 ◽  
Author(s):  
Sackthavy Chandavong ◽  
Kittipong Tonmitra ◽  
Arkom Kaewrawang
Keyword(s):  
Electric Field ◽  
Epoxy Resin ◽  
Direct Current ◽  
Water Drop ◽  
Tap Water ◽  
Water Volume ◽  
Electric Field Line ◽  
Insulating Surfaces ◽  
Dc Electric Field ◽  
Water Drops

This paper presents the flashover between the electrodes conducted the current by the water drop on insulating surfaces. It causes ageing to the insulator and leads to deterioration when the insulator is used for over years. In the experiments, epoxy resin with the water drop is tested by using direct current until flashover of 70 kV. Besides that, the effect of the water volume, the number of the water drop and the water types - tap and aqua water on flashover are investigated. The flashover of tap water grows faster when increases the volume of water drop. The flashover of aqua water does not depend on the volume of water drop. The deformation and elongate of water drop is in the direction of electric field line. The results lead to protect the damage of insulator caused by the humidity and the loss of their efficiency insulators.

The Effect of Deterioration on Insulating Surface due to Flashover under AC Electric Field Stressed by Water Droplets

2014 ◽  
Vol 931-932 ◽  
pp. 979-983
Author(s):  
Sackthavy Chandavong ◽  
Kittipong Tonmitr ◽  
Arkom Kaewrawang
Keyword(s):  
Electric Field ◽  
Water Drop ◽  
Partial Discharge ◽  
Water Droplets ◽  
Humidity Effect ◽  
Insulator Surface ◽  
Ac Electric Field ◽  
Flashover Voltage ◽  
Alternative Current ◽  
Lower Voltage

This paper presents the effect of the flashover on insulating surface under alternative current (AC) electric field stressed by humidity factor. It is obviously demonstrated about the insulator deterioration due to an ageing, partial discharge (PD) when it is used in services. Epoxy resin with the water droplets is brought to test by high voltage AC until flashover voltage levels. The flashover level on insulator surface depends on the volume and the number of the water droplets. The highest flashover voltage is 52.2 kV for the insulator surface without humidity, but the lowest voltage is 43.5 kV for water droplets of 1, 2, 3 and 4 drops (0.5, 1.0, 1.5 and 2.0 ml). Consequently, it leads to use the lower voltage respectively. The deformation of the water drop was oscillated, moved, elongated and broken up in to a several small drops on insulating surface. PD was the result of the flashover phenomena which causes the damage of the insulator. These results lead to protect the insulator surface under humidity effect from flashover phenomena.

Electric Field Analysis of Water Drop Corona

2005 ◽  
Vol 20 (2) ◽  
pp. 964-969 ◽  
Author(s):  
Z. Guan ◽  
L. Wang ◽  
B. Yang ◽  
X. Liang ◽  
Z. Li
Keyword(s):  
Electric Field ◽  
Water Drop ◽  
Field Analysis ◽  
Electric Field Analysis
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