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Development of Radiation Heat Transfer Modeling in Non-gray Media in Industrial Applications

Barezban, Mohammad Bagher | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48167 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. Radiation evaluation in non-gray gaseous media is a very complicated issue. Previous researches have shown that the radiation properties of non-gray gases would strongly depend on the wavelengths. The gray gas assumption is the simplest model to calculate the radiation properties. Dispite simplicity, it is widely used in various industrial applications. In this model the gas radiation properties are assumed no to chang across all wavelengths. Evidently this would results in an inaccurate radiation modeling. Using the Spectral Line-based Weighted-sum-of-gray-gases model, SLW, the spectral behavior of radiation properties of gas is almost taken into account in computations. So the use of this model can result in more accurate predictions without tremendous increase in the related computations. In this research the SLW model is modeled in a commercial CFD solver to solve radiation transfer equation for non-gray gaseous media. The accuracy of SLW model is evaluated by simulating a few simple benchmarks and comparing the achiewed radiation transfer equation solutions with the exact line-by-line solutions. The results show that the accuracy of current SLW model in the radiation transfer computation is better than the pure gray gas model. Finally, the developed code is used to simulate the radiation heat transfer in an industrial furnace, in which the other complex phenomena such as turbulence, combustion, and heat transfer involve simutaneously. The current numerical simulations of flow with two different radiation property models, i.e. SLW and the gray gas models, results in solutions with at most 5% differences in their temperature field and 14% differences in their average radiation heat flux from the furnace walls. These differences indicate the improvement in accuracy of radiation heat transfer computation in non-gray gaseous media, which are available using the current SLW model
  9. Keywords:
  10. Radiation ; Numerical Modeling ; Heat Transfer ; Radiation Properties ; Non-Gray Gas

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