Electric field computation of water droplets on a model insulator

Sarang, B.; Basappa, Prathap; Lakdawala, V.K.; Shivaraj, Gayathri

doi:10.1109/eic.2011.5996182

Cited by 8 publications

(6 citation statements)

References 4 publications

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“…Possible effects of an electric field on ice nucleation range from nanoscale effects involving the orientation of the dipole water molecules (Yan et al, 2014) to macroscale phenomena, such as droplet oscillation in the case of an alternating electric field (Reguera and Rubí, 2003;Löwe et al, 2020;Schütte and Hornfeldt, 1990). Since ice nucleation is a physical process which is extremely sensitive to a variety of parameters, the experimental boundary conditions must be precisely controlled in order to distinguish unambiguously the effects on ice nucleation.…”

Section: Discussion Of the Boundary Conditionsmentioning

confidence: 99%

“…Not only the amplitude and frequency but also the oscillation mode of a sessile droplet may significantly vary for varying boundary conditions, e.g., electric field strength, charge, or droplet size (Löwe et al, 2020). Depending on these parameters, various oscillation modes ranging from droplet oscillation mainly parallel to the surface to oscillations perpendicular to the surface or mixed oscillation modes are possible (Löwe et al, 2020;Schütte and Hornfeldt, 1990). Each of these modes is associated with a different interaction between the moving fluid molecules and the substrate where ice nucleation is predominantly expected.…”

Section: Droplet Motionmentioning

confidence: 99%

“…σ denotes the surface tension between water and the surrounding fluid, and r is the radius of the droplet. Note that the resonance frequency of a sessile droplet resting on a hydrophobic surface is the same as the resonance frequency of a free droplet (Schütte and Hornfeldt, 1990). Taking into account the change of the surface tension and the density accompanying a change of the surrounding fluid from air to oil, the different resonance frequencies relate as follows:…”

Section: Droplet Motionmentioning

confidence: 99%

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Experimental methodology and procedure for SAPPHIRE: a Semi-automatic APParatus for High-voltage Ice nucleation REsearch

et al. 2021

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Abstract. Ice nucleation is of great interest for various processes such as cloud formation in the scope of atmospheric physics, and icing of airplanes, ships, or structures. Ice nucleation research aims to improve the knowledge about the physical mechanisms and to ensure the safety and reliability of the respective applications. Several influencing factors like liquid supercooling or contamination with nucleants, as well as external disturbances such as an electric field or surface defects, affect ice nucleation. Especially for ice crystal formation in clouds and icing of high-voltage equipment, an external electric field may also have a strong impact on ice nucleation. Although ice nucleation has been widely investigated for numerous conditions, the effect of an electric field on ice nucleation is not yet completely understood; results reported in literature are even contradictory on some issues. In the present study, an advanced experimental approach for the examination of ice nucleation in water droplets exposed to an electric field is described. It comprises a method for droplet ensemble preparation and an experimental setup, which allows observation of the droplet ensemble during its exposure to well-defined thermal and electric fields, which are both variable over a wide range. The entire approach aims at maximizing the accuracy and repeatability of the experiments in order to enable examination of even the most minor influences on ice nucleation. For that purpose, the boundary conditions the droplet sample is exposed to during the experiment are examined in particular detail using experimental and numerical methods. The methodological capabilities and accuracy have been demonstrated based on several ice nucleation experiments without an electric field, indicating almost perfect repeatability.

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Section: Discussion Of the Boundary Conditionsmentioning

confidence: 99%

Section: Droplet Motionmentioning

confidence: 99%

Section: Droplet Motionmentioning

confidence: 99%

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Experimental methodology and procedure for SAPPHIRE: a Semi-automatic APParatus for High-voltage Ice nucleation REsearch

et al. 2021

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“…This orientation and the resulting tangentially aligned electric field is chosen to account for the associated macroscopic droplet behavior. In terms of droplet deformation and excitation, a tangentially aligned electric field has a significantly stronger effect on a sessile droplet compared to an electric field aligned normal to the surface (Sarang et al (2011)) and it represents the typical situation on a line insulator. Accordingly, also the effect of the electric field on nucleation is expected to be higher in the case of a tangentially aligned field.…”

Section: Electric Field Generationmentioning

confidence: 99%

Experimental methodology and procedure for SAPPHIRE:a Semi-automatic APParatus for High-voltage Ice nucleation REsearch

Löwe¹,

Schremb²,

Hinrichsen³

et al. 2020

Preprint

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Abstract. Ice nucleation is of great interest for various processes such as cloud formation in the scope of atmospheric research, and icing of airplanes, ships or structures. Ice nucleation research aims to improve the knowledge about the physical mechanisms and, therefore improve the safety and reliability of the applications affected by ice nucleation. Several influencing factors like liquid supercooling or contamination with nucleants, as well as external disturbances such as an electric field or surface defects affect ice nucleation. Especially for ice crystal formation in clouds and icing of high-voltage equipment, an external electric field may have a strong impact on ice nucleation. Although ice nucleation has been widely investigated for numerous conditions, the effect of an electric field on nucleation is not yet completely understood; results reported in literature are even contradictory. In the present study, an advanced experimental approach for the examination of ice nucleation in water droplets exposed to an electric field is demonstrated. It comprises a method for droplet ensemble preparation and an experimental setup, which allows observation of the droplet ensemble during its exposure to well-defined thermal and electric fields, which are both variable over a wide range. The entire approach aims at maximizing the accuracy and repeatability of the experiments in order to enable examination of even the most minor influences on ice nucleation. For that purpose, the boundary conditions the droplet sample is exposed to during the experiment are examined in particular detail using experimental and numerical methods. The methodological capabilities and accuracy have been demonstrated based on several test nucleation experiments without an electric field, indicating almost perfect repeatability.

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“…silicon rubber and porcelain) against the electric field has been researched. The result showed that E-field intensity depended on the distance between the water droplets and the electrodes and also on the relative distance between two water droplets and for multiple droplets the field patterns varied with respect to the change in number, relative position, contact angle of droplets and the location of the water droplet is more significant compared with the number of water droplets [7]. Meanwhile, these water droplets cause the electric field enhancements at the triple points (interfacial point of three dielectric mediums i.e.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dew and Raindrops on Electric Field around EHV Transmission Lines

Utama¹,

Aliyu²

2018

TELKOMNIKA

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This paper analyses the change of electric field in the proximity of 500 kV extra high voltage (EHV) transmission lines, in the presence of raindrops and dew. The computations were carried out using MatLab software b y solving the electrostatic equations. The analysis depicts that the spatial distrib ution of the electric field strength varies with water drop content along the lateral distance along the transmiss ion line. The peak electric field reduces with the water drop content, whereas the electric field remains the same at around 36 m from the transmission line. Then onwards the field strength increases with the water drop content. At long distances the field strength is not affected b y the water drops. Such variation is highly important to analyse the adverse effects on the insulators used in HV applications. The results are of high significance to a country such as Indonesia where the precipitation levels are generally high in most parts of the country.

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Electric field computation of water droplets on a model insulator

Cited by 8 publications

References 4 publications

Experimental methodology and procedure for SAPPHIRE: a Semi-automatic APParatus for High-voltage Ice nucleation REsearch

Experimental methodology and procedure for SAPPHIRE: a Semi-automatic APParatus for High-voltage Ice nucleation REsearch

Experimental methodology and procedure for SAPPHIRE:a Semi-automatic APParatus for High-voltage Ice nucleation REsearch

Effect of Dew and Raindrops on Electric Field around EHV Transmission Lines

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