High-accuracy, compact database of narrow-band k-distributions for water vapor and carbon dioxide

Wang, Anquan; Modest, Michael F.

doi:10.1016/j.jqsrt.2004.08.024

Cited by 85 publications

(52 citation statements)

References 25 publications

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“…They can be compiled directly from high accuracy spectroscopic databases such as HITEMP or CDSD-1000, or the full spectrum k-distributions can be compiled from narrow band (NB) k-distributions. Wang and Modest created a database of pre-compiled NB k-distributions and demonstrated only very small loss of accuracy when compared to generation from LBL databases [25]. The benefit to using pre-complied NB k-distributions is a reduction in computation time, and so this method is adopted for predicting the radiative properties of the gases in CFD modelling.…”

Section: Kþ ð11þmentioning

confidence: 99%

Evaluation of solution methods for radiative heat transfer in gaseous oxy-fuel combustion environments

Porter

Liu

Pourkashanian

et al. 2010

Journal of Quantitative Spectroscopy and Radiative Transfer

114

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Evaluation of solution methods for radiative heat transfer in gaseous oxy-fuel combustion environmentsThe exact solution to radiative heat transfer in combusting flows is not possible analytically due to the complex nature of the integro-differential radiative transfer equation (RTE). Many different approximate solution methods for the solution of the RTE in multi-dimensional problems are available. In this paper, two of the principal methods, the spherical harmonics (P 1 ) and the discrete ordinates method (DOM) are used to calculate radiation. The radiative properties of the gases are calculated using a non-gray gas full spectrum k-distribution method and a gray method. Analysis of the effects of numerical quadrature in the DOM and its effect on computation time is performed. Results of different radiative property methods are compared with benchmark statistical narrow band (SNB) data for both cases that simulate air combustion and oxy-fuel combustion. For both cases, results of the non-gray full spectrum k-distribution method are in good agreement with the SNB data. In the case of oxy-fuel simulations with high partial pressures of carbon dioxide, use of gray method for the radiative properties may cause errors and should be avoided.

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Section: Kþ ð11þmentioning

confidence: 99%

Evaluation of solution methods for radiative heat transfer in gaseous oxy-fuel combustion environments

Porter

Liu

Pourkashanian

et al. 2010

Journal of Quantitative Spectroscopy and Radiative Transfer

114

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“…Since n-node Gauss quadrature has the highest order of accuracy, a set of the abscissas of the Gauss-Chebyshev quadrature (I) described in [11] were chosen for the fixed g-values.…”

Section: Generation Of the K-distributionmentioning

confidence: 99%

“…For practical applications, loading such a huge database into memory is both time-consuming and wasteful because generally only a portion of data is used for certain calculations. To avoid this drawback and also based on the fact that all records in the FSK look-up table are of the same length (there are 32 records at each thermodynamic states for both k-values and a-values), the direct data access method [11] is employed so that only the data needed by the calculations are loaded into the memory, saving both the time for reading the whole table and the memory when carrying out certain calculations. This memory management approach that guarantees the lowest memory cost without affecting the runtime efficiency during certain calculations is known as dynamic loading.…”

Section: Generation Of the K-distributionmentioning

confidence: 99%

“…For each state, say, with three radiatively participating gases (CO 2 , H 2 O and CO) the method requires the assembly of mixture k-distributions or, for a CFD domain with several hundred thousand cells, the same amount of mixture FSKs. To overcome this drawback, Wang and Modest [11] described a narrowband database for individual species, from which FSKs can be assembled efficiently by applying an appropriate mixing model. Cai and Modest [12] regenerated the narrowband database using the newest HITEMP 2010 [13].…”

Section: Introductionmentioning

confidence: 99%

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A full-spectrum k-distribution look-up table for radiative transfer in nonhomogeneous gaseous media

Wang

Modest

et al. 2016

Journal of Quantitative Spectroscopy and Radiative Transfer

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a b s t r a c tA full-spectrum k-distribution (FSK) look-up table has been constructed for gas mixtures within a certain range of thermodynamic states for three species, i.e., CO 2 , H 2 O and CO. The k-distribution of a mixture is assembled directly from the summation of the linear absorption coefficients of three species. The systematic approach to generate the table, including the generation of the pressure-based absorption coefficient and the generation of the k-distribution, is discussed. To efficiently obtain accurate k-values for arbitrary thermodynamic states from tabulated values, a 6-D linear interpolation method is employed. A large number of radiative heat transfer calculations have been carried out to test the accuracy of the FSK look-up table. Results show that, using the FSK look-up table can provide excellent accuracy compared to the exact results. Without the time-consuming process of assembling k-distribution from individual species plus mixing, using the FSK look-up table can save considerable computational cost. To evaluate the accuracy as well as the efficiency of the FSK look-up table, radiative heat transfer via a scaled Sandia D Flame is calculated to compare the CPU execution time using the FSK method based on the narrow-band database, correlations, and the look-up table. Results show that the FSK look-up table can provide a computationally cheap alternative without much sacrifice in accuracy.

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“…The regression scheme utilizes a narrowband k-distribution database [31,32]. Three species (CO 2 , CO and H 2 O) are considered for radiation calculations.…”

Section: Regression Scheme For Heat Source Splittingmentioning

confidence: 99%

Eulerian–Eulerian multi-fluid methods for pulverized coal flames with nongray radiation

Cai

Handa

Modest

2015

Combustion and Flame

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High-accuracy, compact database of narrow-band k-distributions for water vapor and carbon dioxide

Cited by 85 publications

References 25 publications

Evaluation of solution methods for radiative heat transfer in gaseous oxy-fuel combustion environments

Evaluation of solution methods for radiative heat transfer in gaseous oxy-fuel combustion environments

A full-spectrum k-distribution look-up table for radiative transfer in nonhomogeneous gaseous media

Eulerian–Eulerian multi-fluid methods for pulverized coal flames with nongray radiation

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