PREDICTION OF HEAT TRANSFER FROM BURNED GAS IN TRANSITIONAL FLOW INSIDE A TUBE

The direct coupling of a thermally stabilized combustor and a steam generator has previously been shown by Strenger and Churchill to result in minimal concentrations of NO and CO and exceptionally high rates of heat transfer relative to conventional processes. Across the flame front, the Reynolds nu...

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Bibliographic Details
Published in:Numerical heat transfer. Part A, Applications Applications, 1992-07, Vol.22 (1), p.1-19
Main Authors: Strenger, Mark R., Churchill, Stuart W.
Format: Article
Language:English
Subjects:
420400 - Engineering- Heat Transfer & Fluid Flow
Applied sciences
CALCULATION METHODS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
Energy
ENERGY TRANSFER
Energy. Thermal use of fuels
ENGINEERING
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
FLAMES
FLUID FLOW
FLUID MECHANICS
FLUIDS
Furnaces. Firing chambers. Burners
GASES
General. Equipment design. General computation
HEAT TRANSFER
MECHANICS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REYNOLDS NUMBER
THERMOCHEMICAL PROCESSES
TRANSITION FLOW
TUBES
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Summary:The direct coupling of a thermally stabilized combustor and a steam generator has previously been shown by Strenger and Churchill to result in minimal concentrations of NO and CO and exceptionally high rates of heat transfer relative to conventional processes. Across the flame front, the Reynolds number falls from above to below 2100, leading to decaying turbulence and laminarization in the stream of hot burned gas. In the heat exchanger the cooling increases the Reynolds number and results in a sudden transition back to turbulent flow. The development and transition in the flow as well as the confinement are responsible for the high rates of heat transfer. The k-ϵ model has been adapted successfully to predict this complex behavior by using a controlled perturbation to trigger the transition at the experimentally observed point. The predictions not only agree well with experimental measurements of heat transfer but also provide insight into the fluid-mechanical and thermal behavior.
ISSN:1040-7782
1521-0634
DOI:10.1080/10407789208944756