Assessment of SLW-1 model in the presence of gray and non-gray particles

Özen G., ATEŞ C., Selçuk N., KÜLAH G.

INTERNATIONAL JOURNAL OF THERMAL SCIENCES, cilt.136, ss.420-432, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 136
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.ijthermalsci.2018.10.038
  • Dergi Adı: INTERNATIONAL JOURNAL OF THERMAL SCIENCES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.420-432
  • Anahtar Kelimeler: Gas radiation, SLW, SLW-1, Non-gray particle radiation, Radiative heat transfer, RADIATIVE HEAT-TRANSFER, 2-DIMENSIONAL AXISYMMETRICAL ENCLOSURES, DISCRETE ORDINATES METHOD, SPECTRUM K-DISTRIBUTIONS, NARROW-BAND, GAS RADIATION, THERMAL-RADIATION, PROPERTY MODELS, LINES SOLUTION, WEIGHTED SUM
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

In this study, predictive accuracy of Gray Gas and SLW-1 approximations is benchmarked against Spectral Line-Based Weighted Sum of Grey Gases Model (SLW) in multidimensional enclosures involving gray/non-gray absorbing, emitting and scattering particles. Input data required for the radiation code and its validation are provided from two combustion tests previously carried out in a 300 kWt Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) test rig burning low calorific value Turkish lignite with high volatile matter/fixed carbon (VM/FC) ratio in its own ash. Comparisons reveal that SLW-1 approximation leads to one order of magnitude higher accuracy in heat flux and source term predictions compared to that of Gray Gas approximation in the presence of gray particles while maintaining a similar computational efficiency. In the presence of non-gray particles, SLW-1 approximation is again found to improve the predictive accuracy compared to that of Gray Gas approximation. However, it is seen that errors in heat flux and source term predictions with SLW-1 approximation are noticeably higher in the presence of non-gray particles compared to those with gray particles.