## Abstract

The heat transfer characteristics of a hot impinging jet with gas radiation effects are studied. Two-dimensional cylindrical, steady, turbulent flow is simulated using the k-ε model. The discrete-ordinates method is used to solve the equation of radiative transfer for gas radiation. Numerical results are obtained for Reynolds numbers from 2.38×l0^{4} to l.0×l0^{5}. Solutions are presented for the temperature distribution and heat flux along the impingement wall. The effects of important parameters, such as optical properties (absorption coefficient), nozzle-to-plate distance, Reynolds number, and surface emissivity of the wall are examined. The results show that the radiative heat flux at the stagnation point is reduced by 86% approximately when the absorption coefficient of the gas is increased from 0.005 cm^{-1} to 0.2 cm^{-1}. As the nozzle-to-plate distance is increased from 2 to 8 nozzle diameters, the radiative heat flux is reduced by 94% at the stagnation point. When the Reynolds number is decreased from l.0×l0^{5} to 2.38×l0^{4}, the total heat flux is decreased by 25%. The radiative and total heat fluxes decrease as the surface emissivity is decreased.

Original language | English |
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Pages (from-to) | 45-54 |

Number of pages | 10 |

Journal | Transactions of the Aeronautical and Astronautical Society of the Republic of China |

Volume | 36 |

Issue number | 1 |

State | Published - Mar 2004 |

## Keywords

- Discrete-ordinates method
- Gas radiation
- Hot impinging jet