Annular Induction Research Articles

Electrostatic Spraying Characteristics of Twin Fluid Nozzle with Outer Annular Induction Charging Electrode

Electrostatic Spraying Characteristics of Twin Fluid Nozzle with Outer Annular Induction Charging Electrode

3D numerical study of the annular induction plasma installation

In order to know the behavior of the annular induction plasma device and to define its operating conditions at atmospheric pressure, a three-dimensional numerical magneto-thermal model based on the nodal finite element method is presented. The calculation has been done to evaluate the influence of the number of the transformer arms on the field distribution and on the total power of the plasma. The ( A , V) magnetic formulation is applied to multiply connected regions and it is coupled to the thermal one to evaluate the temperature profile.

Numerical analysis, design and experimentation of an annular induction plasma installation

The conception of an annular induction plasma is elaborated. A simplified 1D model is introduced to determine the geometry of a prototype. A 3D model based on AV formulation is then used to modify the values obtained by a 1D model. The finite element method is applied to the electromagnetic and thermal equation, in order to obtain the field and temperature distribution inside the plasma. The possibility of reducing the problem to an axisymmetric one is then studied.

環状局部加熱による重層管製造技術の開発に関する研究（その１） 環状局部加熱・冷却による管の縮径現象

Thermal plastic process for reducing a diameter of metal pipe by heating an annular limited section of the pipe while cooling adjacent sections has been developed.This report is concerned with the method of the process, its principle and the effect of parameters for shrinkage of pipe.The principle of shrinkage of pipe is explained that the limited section of pipe heated by an annular induction coil tends to radially expand outwardly. However, due to the self-restriction against thermal expansion and reducing the yielding strength because of high temperature condition, the heated section's diameter is not increased so much as that of free expansion. As a result, a diameter of thermal plastic processed part is reduced in comparison with initial one after cooling.As for the parameters, maximum temperature, coil length, diameter, wall-thickness and number of repetition are given. Effects of parameters for shrinkage of pipe are as follows.As maximum temperature becomes higher and coil length becomes shorter, the shrinkage of pipe is increased. And as diameter and wall-thickness of the pipe become bigger respectively, the shrinkage is increased slightly.Furthermore, if this process is repeated for the same pipe, the shrinkage is increased.

An inverse method in electromagnetism applied to the optimization of inductors

An inverse method to optimize the efficiency of a linear inductor is proposed. An analytical solution of this method is found for an annular induction machine such as an electromagnetic pump for liquid metal. The solution is compared with a finite-element model.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Design calculations for annular induction electromagnetic pumps based on the finite element method

The paper presents an application of the Galerkin triangular mesh finite element method using linear approximation, in axisymmetrical and plane geometry, to the design of liquid metal annular induction pumps. The code was tested by comparison with: - analytical calculations in simple geometry cases (15 × 15 square mesh) - test results on pumps constructed. Each calculation is also checked by internal balance of powers. The finite element method is particularly suitable for this application where a practical analytical method is not sufficiently accurate.

Impedance Characteristics of the Finite-Length Annular Induction MHD Generator

An analysis of the annular induction MHD (magnetohydrodynamic) generator is carried out for a model employing a finite-length winding and a constant-velocity fluid flowing in the annulus. An expression for the phase impedance is derived which accounts for entrance and exit of the fluid into the winding region. Impedance characteristics are presented which allow comparison with the infinite-length case in terms of dimensionless parameters.

An analysis of the annular induction MHD generator

The analysis is made for a constant-amplitude traveling magnetic field interacting with a constant-velocity fluid flowing in an annular channel. The expressions for input and output densities, electrical conversion efficiency, and generator phase impedance are given. The machine parameters and effects are included through the use of ac machinery concepts. The results are then compared with those for a generator having a rectangular channel.

Deliberate "spontaneous" tympanoplasty: roles of annular induction and basement membranes.

Deliberate "spontaneous" tympanoplasty: roles of annular induction and basement membranes.