کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6594383 | 458011 | 2016 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Efficient calculation of multicomponent diffusion fluxes based on kinetic theory
ترجمه فارسی عنوان
محاسبه کارایی جریان های چندگانه انتشار بر اساس نظریه جنبشی
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
The calculation of the diffusion matrix in mixtures of dilute gases with large numbers (N) of components is revisited. An extremely simple relation providing the multicomponent diffusion matrix as a power series in terms of the Nâ1 independent mole fractions in the mixture is analytically derived from the kinetic theory of gases. This power series provides a convergent scheme with high convergence rate in the case of a gas mixture with one major component in which the remaining Nâ1 species are diluted. However, the convergence rate of this power series is lower if a certain number (M) of these species are far from the dilute limit. In that case we show that a straightforward modification of the former scheme leads to a relation providing the diffusion matrix as a power series in terms of a subset of Nâ1âM mole fractions, which are assumed to be dilute, keeping full dependence on the mole fractions of the remaining 1+Mmajor species. This relation takes full advantage of the usual situation found in combustion, where there is a relatively small number of major species (here 1+M), with the remaining Nâ1âM chemical components (often radicals) being in trace amounts. The error found in the diffusion fluxes with each one of these new methods in a typical combustion scenario is analyzed as a function of the number of terms included in the expansion. It is found that the second method (based on a power series in terms of the dilute species), truncated at the linear term, produces relative errors less than 1% in all the cases considered-including cases far from the dilute limit. Hence, this method provides an efficient tool for the accurate calculation of multicomponent diffusion fluxes in combustion.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 163, January 2016, Pages 540-556
Journal: Combustion and Flame - Volume 163, January 2016, Pages 540-556
نویسندگان
Manuel Arias-Zugasti, Pedro L. Garcia-Ybarra, Jose L. Castillo,