This paper describes an investigation, which uses a torquemeasurement technique, of effects of axial flow on the stability of Taylor-Couette flow. Two radius ratios, 0.846 and 0.956, are used. The preliminary results show that the critical Taylor number for the onset of Taylor vortices increases monotonically with the Reynolds number of the axial flow and asymptotes to a constant value. Althoug...

The purpose of this study is to investigate the effect an elastic wall on peristaltic flow Williamson fluid between two concentric cylinders, where inner tube cylindrical with inelastic and outer a regular sine wave. For problem, coordinates are used short wavelength relative channel width for its length, as well governing equations in Navier-Stokes equations. results evaluated using Mathematic...

Systems that involve liquid crystal alignment between two concentric cylinders have been investigated in connection with the flexoelectric instability [1], with the stability analysis of the orientational profile [2], and the Fréedericksz transition occurring in the absence of external electric field [3]. The starting point of these analysis was the original problem proposed by Meyer, solved in...

We report three-dimensional direct numerical simulations of the turbulent flow between counter-rotating concentric cylinders with a radius ratio 0.5. The innerand outer-cylinder Reynolds numbers have the same magnitude, which ranges from 500 to 4000 in the simulations. We show that with the increase of Reynolds number, the prevailing structures in the flow are azimuthal vortices with scales muc...

An experimental and numerical study has been carried out to investigate the heat transfer by natural convection radiation in a two dimensional annulus enclosure filled with porous media (glass beads) between horizontal concentric cylinders. The outer cylinders are of (100, 82 and70mm) outside diameters inner cylinder 27 mm diameter (or without) annular fins attached it. Under steady state condi...

This article presents the electric field distribution E and dielectric losses ?Pdiel. in insulation system of high-voltage cables. Such a consists inner outer semiconductor screens XLPE insulation. The aim this study was to compare values between objects research were cables 110 kV, 220 400 500 kV. geometrical dimensions cables, especially radii individual layers insulation, as well electrical ...

We studied the evolution of elliptic heavy SF6 gas cylinder surrounded by air when accelerated by a planar Mach 1.25 shock. A multiple dynamics imaging technology has been used to obtain one image of the experimental initial conditions and five images of the time evolution of elliptic cylinder. We compared the width and height of the circular and two kinds of elliptic gas cylinders and analyzed...

A study of the high-heat distribution reacting species with approximation kinetics is essential in practical applications, for example, chemical synthesis, explosion safety and propulsion denotatives. As such, temperature thermal criticality an exothermic a concentric cylinder focus this study. The chemistry pre-exponential factor, termination step, initiation rate branch chain combustible reac...

Background and Objectives: The aim of the present study was to investigate effectsof a single sessionof eccentric or concentric resistance exercise on relative expression of BDNF, PAX7 and IGF-1 in healthy participants. Materials and Methods: In a field trial, ten healthy young men were randomly assigned into two equal groupsof concentric and eccentric contractions. Isokinetic contraction prot...