Scalar turbulence model investigation with variable turbulent Prandtl number in heated jets and diffusion flames

Autor:	M. Aouissi, K. Bensayah, A. Bounif
Rok vydání:	2007
Předmět:	Fluid Flow and Transfer Processes Physics Turbulence K-epsilon turbulence model Prandtl number Turbulence modeling K-omega turbulence model Mechanics Condensed Matter Physics Eddy diffusion Physics::Fluid Dynamics symbols.namesake Classical mechanics symbols Turbulent Prandtl number Scalar field
Zdroj:	Heat and Mass Transfer. 44:1065-1077
ISSN:	1432-1181 0947-7411
DOI:	10.1007/s00231-007-0350-8
Popis:	Traditional turbulence models using constant turbulent Prandtl number fail to predict the experimentally observed anisotropies in the thermal eddy diffusivity and thermal turbulent intensity fields. Accurate predictions depend strongly on the turbulence model employed. Consequently, the objective of this paper is to assess the performance of turbulence model with variable turbulent Prandtl number in predicting of thermal and scalar fields quantities. The model is applied to axisymmetric turbulent round jet with variable density and in turbulent hydrogen diffusion flames using the flamelet concept. The k − ɛ turbulence model is used in conjunction with thermal field; the model involves solving supplemental scalar equations for the temperature variance and its dissipation rate. The model predictions are compared with available experimental data for the purpose of validating model. In reacting cases, velocity and scalar (including temperature and mass fractions) predictions agree relatively well in the near field of the investigated diluted hydrogen flames.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a083c6935352ccf75e0f1d0b7cc78170 https://doi.org/10.1007/s00231-007-0350-8 Zobrazit plný text záznamu Full text from SpringerLink