Topic
Liquid dielectric
About: Liquid dielectric is a research topic. Over the lifetime, 3702 publications have been published within this topic receiving 45150 citations.
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TL;DR: In this article, the authors used a laser-produced plasma to initiate the breakdown of n-hexane and transformer oil in semihomogeneous geometries using a laser triggering method for fields far below the spontaneous breakdown field.
Abstract: Electric breakdown in semihomogeneous geometries has been studied in n-hexane and transformer oil using a laser triggering method for fields far below the spontaneous breakdown field. The method uses a laser-produced plasma to initiate the breakdown. Strong self focusing in the liquids was limited by increasing the numerical aperture of the laser beam to >0.20 prior to focusing. Electrical breakdown could be triggered at fields as low as 50 kV/cm in transformer oil and 25 kV/cm for n-hexane. The time lags are between 30 and 200 /spl mu/s, depending on voltage, liquid, and gap size. Current and light emission measurements of the prebreakdown phenomena are presented and a model for the triggering process is proposed. >
22 citations
TL;DR: In this paper, micro/nano scale features are incorporated on an electrode surface to study its effect on the charge injection characteristics in HFE7100, and the presence of sharp features on the surface with high aspect ratio had a more dominant effect on enhancing the charge-injection performance than the roughness.
22 citations
TL;DR: A convection-dominated mechanism for charge transport is proposed to describe the observed dynamics and rationalize the viscosity dependence of the self-excited dynamics.
Abstract: We study the electrically driven spreading of dielectric liquid films in wedge-shaped gaps across which a potential difference is applied. Our experiments are in a little-studied regime where, throughout the dynamics, the electrical relaxation time is long compared to the time for charge to be convected by the fluid motion. We observe that at a critical normal electric field the hump-shaped leading edge undergoes an instability in the form of a single Taylor cone and periodic jetting ensues, after which traveling waves occur along the trailing thin film. We propose a convection-dominated mechanism for charge transport to describe the observed dynamics and rationalize the viscosity dependence of the self-excited dynamics.
22 citations
TL;DR: In this article, the temporal hydrodynamic response of the free surface of a transparent liquid dielectric due to the passage of an intense, focused laser pulse is considered theoretically, and the calculated focal length of the surface lens is in satisfactory agreement with the recent experimental result of Ashkin and Dziedzic.
Abstract: The temporal hydrodynamic response of the free surface of a transparent liquid dielectric due to the passage of an intense, focused laser pulse is considered theoretically, and the calculated focal length of the surface lens is in satisfactory agreement with the recent experimental result of Ashkin and Dziedzic. An understanding of this effect is important for answering the question of the momentum of light in a material medium.
22 citations
TL;DR: Based on the Poisson Boltzmann equation for electric double layers and Navier-Stokes equation for liquid flows, a mathematical model for describing resistance effects of electric double layer (EDL) on the coupled heat and liquid moisture transfer in porous textiles is developed as mentioned in this paper.
22 citations