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Reactor problems in modified chemical vapour deposition (i). the collapse of quartz glass tubes
Author(s) -
Kirchhof J.
Publication year - 1985
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170200520
Subject(s) - quartz , materials science , tube (container) , glass tube , composite material , viscosity , glass fiber , flow (mathematics) , deposition (geology) , chemical vapor deposition , chemical reactor , traverse , fused quartz , mechanics , thermodynamics , nanotechnology , geology , paleontology , geodesy , sediment , physics
In the case of the so‐called “Modified Chemical Vapour Deposition” for the preparation of optical fiber preforms, the quartz glass reactor is identical with the substrate. Therefore, the knowledge of reactor properties such as the viscous flow of the tubes (collapse) and the heat transport through the wall are especially important for a successful control of the process. As a first step, an analysis is presented for the calculation of the viscous flow of the tubes under the real conditions of dynamic heating by a traversing flame. The experimental determination of the material parameters surface tension and viscosity by collapsing experiments yields an approach to the problem of the temperature distribution in the tube wall.