scholarly journals Modeling batch melting: Roles of heat transfer and reaction kinetics

2019 ◽  
Vol 103 (2) ◽  
pp. 701-718 ◽  
Author(s):  
Richard Pokorný ◽  
Pavel Hrma ◽  
Seungmin Lee ◽  
Jaroslav Klouzek ◽  
Manoj K. Choudhary ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Reaction Kinetics ◽  
Batch Melting

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.

Catalytic Ignition Properties and Surface Reaction Kinetics Modeling From Methane in Oxygen-Nitrogen Mixtures on Platinum

2012 ◽  
Author(s):  
Duane Elgan ◽  
Judi Steciak ◽  
Ralph Budwig ◽  
Steve Beyerlein
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Reaction Kinetics ◽  
Surface Reaction ◽  
Flow Reactor ◽  
Platinum Catalyst ◽  
Flow Simulation ◽  
Transfer Model ◽  
Measurement Capability ◽  
Surface Reaction Kinetics

The ignition temperature and heat generation from oxidation of methane on a platinum catalyst were determined experimentally. A 127 micron diameter platinum coiled wire was placed crosswise in a quartz tube of a plug flow reactor. A source meter with a 4-wire measurement capability measured the resistance and current to calculate the average temperature of the surface reaction. Light-off temperatures varied from 730–780K for methane for a fuel-oxygen equivalence ratio of 0.3 to 1.0 at fuel percentages of 2–5% by volume. A model of the experimental system was created using Fluent coupled with Chemkin to combine an advanced chemistry solver with flow simulation. The experimental data was compared to the model results, which includes heat transfer and the surface reaction kinetics of methane on platinum. The heat transfer model obtained values within 4 Kelvin to experimental data for temperatures between 400K and 700K. At temperatures greater than 700K the model deviated with temperatures greater than the experimental by up to 60 Kelvin.

A synergistic study of reaction kinetics and heat transfer with multi-component modelling approach for the pyrolysis of biomass waste

Energy ◽  
2020 ◽  
Vol 204 ◽  
pp. 117933 ◽  
Author(s):  
Hammad Siddiqi ◽  
Usha Kumari ◽  
Subrata Biswas ◽  
Asmita Mishra ◽  
B.C. Meikap
Keyword(s):  
Heat Transfer ◽  
Reaction Kinetics ◽  
Biomass Waste ◽  
Pyrolysis Of Biomass ◽  
Modelling Approach

scholarly journals SIMULATION VERSUS DESIGN: TWO CASE STUDIES IN CHEMICAL REACTION KINETICS AND RADIATIVE HEAT TRANSFER

2011 ◽  
Author(s):  
Redhouane Henda
Keyword(s):  
Heat Transfer ◽  
Reaction Kinetics ◽  
Case Studies ◽  
Chemical Reaction ◽  
Design Education ◽  
Radiative Heat ◽  
Free Fall ◽  
Experimental Simulation ◽  
Chemical Reaction Kinetics ◽  
Engineering Design Education

This paper describes two instructional modules pertaining to engineering design education and developed via two design approaches. The first module concerns itself with experimental simulation of chemical reaction kinetics using the analogy with the free-fall of a non-viscous liquid in ducts of various shapes. The second module is concerned with computer simulation of heat exchange via thermal radiation in a 3-D enclosure with nontrivial features. Both modules involve a series of case studies to enhance students understanding of the engineering concepts under consideration and to expose them to the power of both experimental and computer designs.

Reaction kinetics and heat transfer studies in thermoset resins

1999 ◽  
Vol 72 (1) ◽  
pp. 53-61 ◽  
Author(s):  
A Nzihou ◽  
P Sharrock ◽  
A Ricard
Keyword(s):  
Heat Transfer ◽  
Reaction Kinetics ◽  
Thermoset Resins
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