Quasi-Steady Diffusion Flame Theory with Variable Specific Heats and Transport Coefficients
| Autor: | H. K. Law, Chung K. Law |
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| Rok vydání: | 1976 |
| Předmět: | |
| Zdroj: | Combustion Science and Technology. 12:207-216 |
| ISSN: | 1563-521X 0010-2202 |
| DOI: | 10.1080/00102207608946722 |
| Popis: | A theory is developed to account for the variable nature of the specific heats C and the transport coefficients of thermal and mass diffusion, λ and D, in quasi-steady one-dimensional diffusion flames, using bipropellant droplet combustion as an illustration. In the theory C, λ and D are all temperature dependent whereas C and λ are further concentration-weighted; consequently all the existing variable-property droplet combustion models are special cases of the present generalized model. By allowing these coefficients to assume realistic functional forms, explicit expressions are derived for the concentration-weighted coefficients, the temperature and species profiles, the mass burning rate, and the flame-front standoff ratio. Predicted results yield improved, yet much less ambiguous, agreement with experimental observations. Finally it is shown that such good agreement can also be achieved by utilizing a simplified, temperature-independent, model and by evaluating the concentration-weighted coef... |
| Databáze: | OpenAIRE |
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