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Electrokinetics of Dielectric Non-Newtonian Bio Fluids with Heat Transfer Through a Flexible Channel : Numerical Study

100%

Mekheimer K. S. , Hasona W. M. , El-Shekhipy A. A. , Zaher A. Z.

Computational Methods in Science and Technology

2017

tom Vol. 23, No. 4

331--341

Throughout this paper we investigate the effect of a vertical alternative current AC and heat transfer on the peristaltic flow of a couple stress dielectric fluid (blood flow model) in a symmetric flexible sinusoidal wavy channel. In order to solve the system of coupled non-linear partial differential equations, a program designed by Mathematica software "parametric NDSolve package" is used, which pertains to describe the momentum, the energy, and the electric potential that is obtained from using a regular perturbation method with small amplitude ratio. The numerical formulas of the mean velocity, the mean temperature, and the mean electric field are computed and the phenomenon of reflux (the mean flow reversal) is discussed. Moreover, the physical parameters effects of the problem on these formulas are described and illustrated graphically. The results reveal that the mean time averaged velocity is accelerated in the presence of AC electric field and decelerated for the couple stress fluid model (a special case of non-Newtonian fluid). The mean time averaged temperature is high in the presence of an alternative current AC electric field. This results model imply that the physiological role of AC electric field enhances blood circulation and this might help to eliminate the metabolic waste products and endogenous pains producing.

Investigation of Surface Characteristics of Inconel-625 by EDM with Used Cooking Oil-Based Biodiesel as Dielectric Fluid

100%

Khan M. Y. , Rao P. S. , Pabla B. S.

Archives of Metallurgy and Materials

2023

tom Vol. 68, iss. 4

1225--1232

In this investigation, the surface characteristics of Nickel based superalloy Inconel-625 were evaluated by the electrical discharge machining with used cooking oil-based biodiesel as a dielectric. Nickel-based superalloys find wide applicability in numerous industries due to their specific properties. The Cu electrodes of various densities prepared by atomic diffusion additive manufacturing process were used for machining. A comparison of the performance was made based on average surface roughness. The Design-expert software was used for experimental design and parametric analysis. The outcome demonstrated that bio-dielectric fluid produced improved surface characteristics. The surface roughness was observed to reduce. The surface micrograph obtained from scanning electron microscopy also confirms a better surface finish of bio-dielectric fluid over EDM oil. The surface roughness was shown to be most significantly influenced by the discharge current, with the other parameters having little or no effect. The results showed that for bio-dielectric, the lowest Ra was 0.643 µm, and for EDM oil, the highest value of 0.844 µm. The slightest difference in roughness value for two dielectric fluids was 0.013 µm, and the highest difference was 0.115 µm.

Capillary instability of fluid cylinder under the effect of transverse varying electric field

86%

Radwan A. E. , Radwan H. A.

Mechanics and Mechanical Engineering

2004

tom Vol. 7, nr 1

151-158

The electrodynamic instability of a capillary dielectric fluid cylinder (radius a and density p) penetrated by a uniform axial electric field surrounded by a transverse varying electric field is investigated. A general dispersion relation to all possible axisymmetric modes of perturbation for all short wavelengths and long wavelengths is derived and discussed in detail. The model is capillary stable to axisymmetric modes if the longitudinal wave number normalized with respect to the jet radius is equal to or greater than 1.05757 and vice versa. The axial electric fields pervading the interior and the exterior ofthe cylinder are stabilizing or destabilizing for all disturbance modes according to some restrictions. The transverse varying electric field is purely stabilizing in the axisymmetric disturbances for all wavelengths. The electrodynamic force has a strong stabilizing influence in the axisymmetric mode and can suppress the capillary instability above a certain value of the basic electric field.