Three dimensional numerical study of different parameters effect on the external magnetic field applied to center the arc of the horizontal mercury discharge lamp

Mohamed Bechir Ben Hamida,Kamel Charrada

doi:10.1063/1.4933238

Mohamed Bechir Ben Hamida, Kamel Charrada

Open Access

https://doi.org/10.1063/1.4933238

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Journal: AIP Advances	Publication Date: Oct 1, 2015
Citations: 15	License type: cc-by

Affiliation: University of Monastir, University of Sousse

Abstract

The aim of this paper is to evaluate the magnitude of the external magnetic field to be applied to a horizontal mercury discharge lamp such that the Lorentz forces counterbalance buoyancy forces and the hot region of the arc remains centered inside the lamp with the variation of six parameters of the lamp such as the external temperature of the lamp, envelope thickness, convective loss, Interelectrodeslength, pressure and current supply pointing to the influence of the parameters to the compensating magnetic field value. To achieve this objective, a commercial numerical software “Comsol Multiphysics” is used to implement the model that solves the equations of mass, energy and momentum for laminar compressible flow combined with the Laplace equation for the plasma in a three dimensional.

Highlights

The study of the convection in mercury discharge lamp has been the center of interest of many researchers
The aim of this paper is to evaluate the magnitude of the external magnetic field to be applied to a horizontal mercury discharge lamp such that the Lorentz forces counterbalance buoyancy forces and the hot region of the arc remains centered inside the lamp with the variation of six parameters of the lamp such as the external temperature of the lamp, envelope thickness, convective loss, Interelectrodeslength, pressure and current supply pointing to the influence of the parameters to the compensating magnetic field value
We compared our three-dimensional model with the experimental measurements by Zollweg[1] for the case of the lamp in a vertical position

Summary

Introduction

The study of the convection in mercury discharge lamp has been the center of interest of many researchers. For the case of the lamp operated in vertical position, we can be mentioned Zollweg,[1] Wendelstorf,[2] Flesch,[3] Fischer,[4] Beks,[5] Charrada and Zissis.[6,7,8] In their studies, they concluded that the arc has a symmetry that is why they have been content for a two-dimensional code. This limitation applies only to the vertical configuration of the lamp. They concluded that the arc was not symmetrical and the convection flow was driven by gravity force

Objectives

Results

Conclusion