Abstract
It is important in the modeling of jet diffusion flames to represent a so-called laminarization due to the existence of flames. The k-ε turbulence model is applicable only to fully turbulent flow fields. Thus, modification is necessary to represent the laminarization because of the phenomena caused by the increase of molecular viscosity due to high temperature in low-turbulence flow fields. In the pressent study, some modification was added to the k-ε model to make it applicable to low-turbulence regions. Hot air jets were used because neither density fluctuation nor heat release exists and the laminarization is easy to examine in them. The obtained medified k-ε model was revealed to represent well the experimental results for hot air jets in a wide range of Reynolds numbers between laminar to turbulent regions.
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