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We propose a novel method to measure the dielectric constant of insulating liquids using a laser beam. We use a research ellipsometer composed of a laser source, a polarizer, a compensator, a sample holder, an analyzer, and a photo-detector. The laser beam passes through the oil sample and accordingly undergoes polarization changes of its electric vector components; parallel and perpendicular to the...
The comprehensive and detailed analysis of the data for real dielectrics [1] in particular in some sandstones [2] gives the exponent time dependence for the depolarization current that has been referred to in literature [1] as the “Universal Response” phenomenon (URP). We consider that one of the main reasons which determines the URP is the structure heterogeinity caused by random fractal geometry...
The studies reported have been carried out on the dielectric behaviour of dilute solutions of R1(CH2)nR2, n ≧12 where R1 and R2 are highly dipolar groups. A recently developed chain doubling synthesis technique allows very low levels of homologous impurity to be achieved, hence providing essentially monodispersed material at large n. Association effects are described together with molecular configurational...
The application of high electrical fields to a liquid dielectric induces internal pressures. These internal pressures have been the subject of numerous investigations [1–5].
We show, in figs 1–5, how some typical current density characteristics are affected by variations in the model parameters. Although a direct comparison with experiment is not included in the present work the shape and magnitude of these curves agree closely with those obtained from experimental measurements on typical non-polar liquids [8]. Our choice of recombination coefficients is also broadly...
Series of experiments have shown that when liquid flows over the surface of solid body, both the liquid and the solid body become electrified, mainly because of friction. The quantity of charge and its polarity depends on mutual induction of the two bodies, also on their dielectrical previousness.
Dielectric and Ultrasonic study of tert-butyl alcohol(TBA) and tert-amyl alcohol (TAA) in solution in non-polar solvents is done. The dipole moment is evaluated using ultrasonic velocity and compared with that obtained from dielectric studies. Using free volume, molar volume, the contribution of electronic polarizability, London dispersion forces and dipole dipole interaction are estimated. The non-linear...
Living systems appear to be making use of the whole of the non-ionising electromagnetic spectrum for purposes of information transfer and regulation. Since they operate in an aqueous environment, the dielectric properties of water, lipids, macromolecules and hydrophi1lc-hydrophobic interfaces are also of importance over the whole spectrum.
Experimental relationships between pressure drop increase and heat transfer increase, as result of applying an electic field to forced convection heat transfer of oil in a circular tube, are presented as functions of current and applied voltage. A negative electric field results in more marked enhancement of heat transfer and pressure drop than a positive field at the same voltage. However, both heat...
The four studied oils have the same chemical structure and our results show that in spite of very different molecular chain lengths the Iliq. values and the photocurrent values measured under identical experimental conditions are almost the same. At present, we are extending our experiments to methyl-phenyl silicone oils and trying to verify if such a behaviour is also observed in this type of oils.
Values of thermalization ranges bGp were estimated from measured free ion yields using the extended Onsager model in ethene, propene, cyclopropane, propane, n-butane and i-butane at 0.15 ≲ d/dc < 3 (dc = critical fluid density). At d/dc < 0.3 the density normalized range bGpd was (5.5 ± 0.2) 10−6 kg/m2 for the present alkanes and methane and ethane. The double bond in ethene, and the double...
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