Effect of excited oxygen molecule production on exchange reaction kinetics and heat transfer during atmospheric entry

1993 ◽  
Vol 27 (5) ◽  
pp. 754-755
Author(s):  
V. D. Berkut
Keyword(s):  
Heat Transfer ◽  
Reaction Kinetics ◽  
Exchange Reaction ◽  
Oxygen Molecule ◽  
Atmospheric Entry ◽  
Excited Oxygen ◽  
Molecule Production

Heat and Mass Transfer in a CVD Optical Fiber Coating Process

Volume 3 ◽  
2004 ◽  
Author(s):  
Wei Huang ◽  
Wilson K. S. Chiu
Keyword(s):  
Heat Transfer ◽  
Optical Fiber ◽  
Reaction Kinetics ◽  
Gas Flow ◽  
Chemical Vapor ◽  
Parameter Study ◽  
Inlet Temperature ◽  
Transfer Model ◽  
Phase Reaction ◽  
Empirical Parameter

In this paper, we study the chemical vapor deposition (CVD) process used to hermetically coat optical fibers during draw. Temperature is calculated by coupling radiation and convection heat transfer by the reactor walls and gas flow with a radially-lumped heat transfer model for the moving optical fiber. Multi-component species diffusion is modeled using the Maxwell-Stefan equations. Gas-phase reaction kinetics is modeled using a 2-step chemical kinetics mechanism derived from RRKM theory with detailed kinetics data compiled from literature. Surface reaction kinetics are described using collision theory in which a sticking coefficient is used as an empirical parameter to predict surface reactions. A parameter study is carried out with various optical fiber inlet temperature and drawing speed, and validated with experiment results.

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