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 studied three-dimensional natural convection flow and heat transfer for a heated, protruding substrate-mounted chip or package in a cubic enclosure filled with a dielectric liquid.
32 citations
TL;DR: In this paper, the effect of temperature variations of both ionic mobility and dielectric constant on the stability of a horizontal layer of liquid subjected to a DC electric field with heating and an arbitrary injection of unipolar charge from below is analyzed.
Abstract: The effect of temperature variations of both ionic mobility and dielectric constant on the stability of a horizontal layer of dielectric liquid subjected to a DC electric field with heating and an arbitrary injection of unipolar charge from below is analysed. The marginal stability boundaries for steady convection are determined by numerical solution of the linearised thermo-electrohydrodynamic perturbation equations.
32 citations
TL;DR: In this article, a numerical model capable of predicting the complete transient histories of droplets in systems with a wide range of dispersed and continuous-phase densities, viscosities, relative permittivities, and electric field strengths is examined.
Abstract: The problem of freely-suspended liquid droplets deforming due to an applied electrostatic field is examined. Developed is a numerical model capable of predicting the complete transient histories of droplets in systems with a wide range of dispersedand continuous-phase densities, viscosities, relative permittivities, and electric field strengths. For liquid/gas systems, the predictions of the numerical model demonstrated that the critical field strength and critical permittivity ratio during actual transient breakup are not necessarily the same as those predicted by steady-state theories. An approximate analytical model of transient droplet deformation is also developed, which is able to predict the deformation time histories for large Ohnesorge number, small-deformation liquid/liquid systems. The approximate analytical model agreed well with the results of the complete numerical model.
32 citations
TL;DR: Anisotropic separation into liquid and vapor phases is possible in high electric fields for a liquid that is initially in unstable state, as well as in metastable or stable states.
Abstract: The linear stability analysis of dielectric liquid placed in uniform electric field with respect to perturbations of density of an initially uniform state was carried out. The electric field increases the instability increment for the stratification along the field and decreases it for the transversal stratification. Thus, anisotropic separation into liquid and vapor phases is possible in high electric fields for a liquid that is initially in unstable state, as well as in metastable or stable states. Computer simulations of electrohydrodynamics confirm the theoretical calculations. It is important that new regions of low density phase appear as narrow cylindrical channels oriented along the field. This mechanism of generation of gaseous phase in locally high electric field can play a key role in processes of inception and ultrafast propagation of streamers during breakdown of liquid dielectrics in nanosecond range.
32 citations
TL;DR: In this paper, an experimental study on pool boiling heat transfer from finned copper surfaces immersed in a saturated dielectric liquid (Galden HT-55) is presented.
31 citations