Comparison between performances of Monte Carlo method and method of lines solution of.discrete ordinates method

Date

2005-06-01

Author

Demirkaya, G
Arinc, F
Selçuk, Nevin
Ayranci, I

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

170
views

0
downloads

Monte Carlo method was used to predict the incident radiative heat fluxes on the freeboard walls of the METU 0.3 MWt atmospheric bubbling fluidized bed combustor based on the data reported previously. The freeboard was treated as a rectangular enclosure with gray interior walls and gray, absorbing, emitting and isotropically scattering medium. A Monte Carlo solver was developed and the performance of the solver was assessed by comparing its predictions with those of method of lines solution of discrete ordinates method and experimental measurements reported previously. Parametric studies were carried out to examine the effects of particle load and anisotropic scattering on the, predicted incident radiative heat fluxes. The comparisons show that Monte Carlo method reproduces the measured incident radiative heat fluxes reasonably well for the freeboard problem.

Subject Keywords

Fluidized bed combustor, Discrete ordinates method, Monte Carlo method, Method of lines

URI

https://hdl.handle.net/11511/32016

Journal

JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER

DOI

https://doi.org/10.1016/j.jqsrt.2004.08.016

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Monte Carlo solution of a radiative heat transfet problem in a 3-D rectangular enclosure containing absorbing, emitting and anisotropically scattering medium Demirkaya, Gökmen; Arınç, Faruk; Department of Mechanical Engineering (2003) In this study, the application of a Monte Carlo method (MCM) for radiative heat transfer in three-dimensional rectangular enclosures was investigated. The study covers the development of the method from simple surface exchange problems to enclosure problems containing absorbing, emitting and isotropically/anisotropically scattering medium. The accuracy of the MCM was first evaluated by applying the method to cubical enclosure problems. The first one of the cubical enclosure problems was prediction of radiat...
Radiative Heat Transfer in the Dilute Zone of an Air-Fired Circulating Fluidized Bed Combustor and Its Oxy-Fired Retrofit Ozen, G.; Aydin, F.; Selçuk, Nevin (2016-01-01) A 2D radiation model based on method of lines (MOL) solution of discrete ordinates method (DOM) coupled with spectral line-based weighted sum of gray gases model (SLW) is developed to predict radiative heat fluxes along the dilute zone of the lignite-fired 150 kWt Middle East Technical University (METU) circulating fluidized bed combustor (CFBC) under both air-fired and oxy-fired conditions. The dilute zone is treated as an axisymmetric cylindrical enclosure containing a non-gray, absorbing-emitting-isotrop...
The method of lines solution of discrete ordinates method for radiative heat transfer in cylindrical enclosures Harmandar, S; Selçuk, Nevin (2004-04-01) A radiation code based on method of lines solution of discrete ordinates method for radiative heat transfer in axisymmetric cylindrical enclosures containing absorbing-emitting medium was developed and tested for predictive accuracy by applying it to (i) test problems with black and grey walls (ii) a gas turbine combustor simulator enclosing a non-homogeneous absorbing-emitting medium and benchmarking its steady-state predictions against exact solutions and measurements. Comparisons show that it provides ac...
Influence of soot on radiative heat transfer in bubbling fluidized bed combustors Yaşar, Mehmet Soner; Selçuk, Nevin; Külah, Görkem (2021-08-01) The effect of soot particles and aggregates on radiative heat transfer in bubbling fluidized bed combustors is investigated. For this purpose, a soot radiative property model based on Rayleigh scattering theory is coupled with in-house developed 1-D gray and spectral radiation codes and a 3-D spectral radiation code based on method of lines solution of discrete ordinates method for the application of (i) a 1-D slab problem involving combustion gases and soot and (ii) freeboard of a 0.3 MWt atmospheric bubbl...
Evaluation of nusselt number for a flow in a microtube with constant heat flux including axial conduction, viscous dissipation and second-order slip model Çetin, Barbaros; Bayer, Özgür (2010-09-28) In this paper, the fully-developed temperature profile and corresponding Nusselt value is determined analytically for a gaseous flow in a microtube with a thermal boundary condition of constant wall heat flux. The flow assumed to be laminar, and hydrodynamically and thermally fully developed. The fluid is assumed to be constant property and incompressible. The effect of rarefaction, viscous dissipation and axial conduction, which are important at the microscale, are i...

Citation Formats

G. Demirkaya, F. Arinc, N. Selçuk, and I. Ayranci, “Comparison between performances of Monte Carlo method and method of lines solution of.discrete ordinates method,” JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, pp. 115–124, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32016.