A thermodynamical study of halogen lamps with carbon additive

T. Geszti, T. Vicsek

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A thermodynamical calculation scheme is worked out to study radial and axial transport of tungsten in a halogen incandescent lamp. The approximations of a common diffusion coefficient for all gaseous components and local chemical equilibrium are used. Non-blackening is connected to an inequality forbidding deposition of tungsten onto the bulb wall. Chemical attack or growth of a given part of the coil is characterized by the second derivative of the global pressure of tungsten along the coil. The gettering effect of carbon on oxygen is shown to be limited by partial deposition of carbon as well as the formation of CO2 that decomposes at the coil releasing active oxygen.

Original languageEnglish
Article number004
Pages (from-to)903-912
Number of pages10
JournalJournal of Physics D: Applied Physics
Volume9
Issue number6
DOIs
Publication statusPublished - 1976

Fingerprint

Tungsten
Halogens
Electric lamps
halogens
luminaires
tungsten
coils
Carbon
carbon
chemical attack
Incandescent lamps
Chemical attack
bulbs
Oxygen
releasing
oxygen
chemical equilibrium
Reactive Oxygen Species
diffusion coefficient
Derivatives

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

A thermodynamical study of halogen lamps with carbon additive. / Geszti, T.; Vicsek, T.

In: Journal of Physics D: Applied Physics, Vol. 9, No. 6, 004, 1976, p. 903-912.

Research output: Contribution to journalArticle

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