Heat and mass transfer study of impinging turbulent premixed flames |
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Authors: | H H Liakos E P Keramida M A Founti N C Markatos |
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Institution: | (1) Department of Chemical Engineering National Technical University of Athens Zografou Campus, 157 80, Greece, GR;(2) Department of Mechanical Engineering National Technical University of Athens Zografou Campus, 157 80, Greece, GR |
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Abstract: | Impinging jet combusting flows on granite plates are studied. A mathematical model for calculating heat release in turbulent
impinging premixed flames is developed. The combustion including radiative heat transfer and local extinction effects, and
flow characteristics are modeled using a finite volume computational approach. Two different eddy viscosity turbulence models,
namely the standard k–ɛ and the RNG k–ɛ model with and without radiation (discrete transfer model) are assessed. The heat released predictions are compared with
experimental data and the agreement is satisfactory only when both radiative heat transfer and local extinction modeling are
taken into account. The results indicate that the main effect of radiation is the decrease of temperature values near the
jet stagnation point and along the plate surface. Radiation increases temperature gradients and affects predicted turbulence
levels independently of the closure model used. Also, the RNG k–ɛ predicts higher temperatures close the solid plate, with and without radiative heat transfer.
Received on 13 November 2000 / Published online: 29 November 2001 |
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