Thermal study of the atomic ratio effect on a cylindrical and an ellipsoidal shaped HgTlI discharge lamps

• Published in: The European physical journal. D, Atomic, molecular, and optical physics Vol. 73; no. 9; pp. 1 - 10
• Main Authors: Ferjani, Besma, Ben Hamida, Mohamed Bechir
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.09.2019; Springer Nature B.V
• Subjects: Applications of Nonlinear Dynamics and Chaos Theory; Atomic; Conduction heating; Conductive heat transfer; Convective flow; Discharge lamps; Equilibrium conditions; Local thermodynamic equilibrium; Molecular; Optical and Plasma Physics; Organic chemistry; Physical Chemistry; Physics; Physics and Astronomy; Quantum Information Technology; Quantum Physics; Regular Article; Spectroscopy/Spectrometry; Spintronics; Thallium; Thermodynamic properties; Time dependence; Plasma Physics
• ISSN: 1434-6060; 1434-6079
• DOI: 10.1140/epjd/e2019-100031-x

The purpose of this paper is to study the thermal behavior of a high-intensity HgTlI lamp in a cylindrical shape, compared to an ellipsoidal lamp during variations of the mercury to thallium atomic ratio. For this, we developed a chemical model under Local Thermodynamic Equilibrium conditions. Then, it was coupled with a three-dimensional code, time-dependent that solves the systems of equations for the mass, energy and momentum, as well as the equation of Laplace for the plasma using Comsol Multiphysics coupled with Matlab. Based on the variations of the mercury to thallium ratio, we analyzed the temperature fields, the heat conduction flow, the convective flow and the accumulation of mercury behind the electrodes for both of the shapes in different mercury to thallium ratios. Graphical abstract