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 paper, the authors measured the dielectric breakdown voltage of transformer oil-based nanofluids in accordance with IEC 156 standard and investigated the breakdown performance with the application of an external magnetic field and different volume concentrations of magnetic nanoparticles.
36 citations
TL;DR: In this article, the linear stability threshold of a dielectric liquid subjected to unipolar injection in a two-dimensional rectangular enclosure with rigid boundaries was investigated, and the velocity field and charge density distribution were derived as a function of the aspect ratio of the domain.
Abstract: We investigate the linear stability threshold of a dielectric liquid subjected to unipolar injection in a two-dimensional rectangular enclosure with rigid boundaries. A finite element formulation transforms the set of linear partial differential equations that governs the system into a set of algebraic equations. The resulting system poses an eigenvalue problem. We calculate the linear stability threshold, as well as the velocity field and charge density distribution, as a function of the aspect ratio of the domain. The stability parameter as a function of the aspect ratio describes paths of symmetry-breaking bifurcation. The symmetry properties of the different linear modes determine whether these paths cross each other or not. The resulting structure has important consequences in the nonlinear behaviour of the system after the bifurcation points.
36 citations
TL;DR: In this article, the effect of corona on the long-time dielectric strength of insulation is emphasized and various factors influencing the breakdown of insulation with corona are discussed.
Abstract: The effect of corona on the long-time dielectric strength of insulation is emphasized in this paper, and various factors influencing the breakdown of insulation with corona are discussed. Data on the corona threshold voltages on dielectric surfaces at electrode edges show that the threshold voltage varies for a wide variety of dielectrics only as the ratio of dielectric thickness to dielectric constant.
36 citations
TL;DR: In this paper, a high-resolution upwind scheme is applied to study the flow bifurcations and heat transfer of dielectric liquid in a square cavity driven by the simultaneous action of Coulomb and buoyancy forces.
Abstract: Electrothermohydrodynamic flow of dielectric liquid in a square cavity driven by the simultaneous action of Coulomb and buoyancy forces is studied numerically. A high resolution upwind scheme is applied to study the flow bifurcations and heat transfer. We focus on the strong injection case with the nondimensional injection parameter C fixed at C = 10. Two Prandtl numbers Pr = 1 and Pr = 10, two Rayleigh numbers Ra = 105 and Ra = 106, as well as two mobility numbers M = 10 and M = 20 are considered to evaluate the dependence of flow structure and heat transfer on these parameters. Multistates are found to coexist in a wide range of parameter regimes. Various flow patterns such as one-cell, two-cell, four-cell, and multicell flow are observed. The electric field is found to enhance heat transfer more efficiently for large Prandtl number fluid at low mobility parameter and relatively low Rayleigh number.
36 citations
TL;DR: In this paper, a series of experiments concerning flow electrification have been made in our laboratory, where a dielectric liquid is forced to flow through relatively short insulating channels, show that experimental results cannot be reproduced using the classical wall current equation.
36 citations