Fuel and Combustion

Fuel and Combustion

Gas Radiation Effect on Thermal Characteristics of Porous Radiant Burner

Authors
Mohammad mehdi Keshtkar 1
Seyed Abdolreza Gandjalikhan Nassab 2
1 Faculty of Mechanical Engineering, Islamic Azad University, Kerman Branch, Kerman, Iran
2 Faculty of Mechanical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
Abstract
Thermal characteristics of a porous radiant burner (PRB) including gas radiation effects are identified in the present study. This system operates on the basis of effective energy conversion method between flowing gas enthalpy and thermal radiation. In the PRB, the gas and solid phases are considered in non-local thermal equilibrium and combustion is modeled by considering a non-uniform heat generation zone. The porous media as a gray body, in addition to its convective heat exchange with the gas, can absorb, emit and scatter thermal radiation. In order to accurately determine the thermal characteristics of PRB, the gas radiation is also taken into account and a theoretical analysis is conducted for a two dimensional model, where convection, conduction and radiation take place simultaneously in porous medium and gas flow. Discrete ordinates method is used to obtain the distribution of radiative heat flux in the porous media and the coupled energy equations for the gas and porous medium in steady condition are solved numerically. The crucial influence of gas radiation effect on the systemand#39;s performance is thoroughly explored. A comparison has been made between the present numerical results and those reported by other investigators to validate the simulation for the gas radiative effect.
Keywords
Porous radiant burner
2-D radiative field
Gas radiation
1.     I. Malico, X. Y. Zhou and J. C. F. Pereira, “Two Dimensional Numerical Study of Combustion and Pollutants in Porous Burner,” Combust.  Sci. and Tech, 152, 2000, pp. 57-79.
2.     T. C. Hayashi, I. Malico and J. C. F. Pereira, “Three-Dimensional Modeling of a Two-Layer Porous Burner for Household Applications,” J. Computers & Structures, 82, 2004, pp. 1543-1550.
3.     T. Takeno and K. Sato, “Heat Transfer Characteristics of Porous Radiant Burners,” Combust. Sci. Technol., 20, 1979, pp. 73-84.
4.     S. B. Sathe and T. W. Tong, “A Numerical Analysis of Heat Transfer and Combustion in Porous Radiant Burners,” Int. J. Heat Mass Transfer, 33, 1990, pp. 1331-1338.
5.     T.  Tong and S. Sathe, “Heat Transfer Characteristics of Porous Radiant Burners,” Trans. of ASME, J. Heat Transfer, 113, 1991, pp. 423-428.
6.     C. L. Hackert and J. L. Ellzey, “Combustion and Heat Transfer in Model Two-Dimensional Porous Burners,” J. Combustion and Flame, 116, 1999, pp. 177-185.
7.     G. Brenner, “Numerical and Experimental Investigation of Matrix–Stabilized Methane/Air Combustion in Porous Inert Media,” J. Combust. Flame, 123, 2000, pp. 201-213. 
8.     S. C. Mishra, “Heat Transfer Analysis of a Two Dimensional Rectangular Porous Radiant Burner,” J. Heat and Mass Transfer, 33, 2006, pp. 467-474.
9.     P. Talukdar, “Heat Transfer Characteristics of a Porous Radiant Burner under the Influence of a 2-D Radiation Field,” J. Quantitative Spectroscopy & Radiative Transfer, 2003, pp. 1-11.
10.  P. Talukdar, “Heat Transfer Characteristics of a Porous Radiant Burner under the Influence of a 2-D Radiation Field”, J. Quantitative Spectroscopy & Radiative Transfer, pp. 1-11, 2003.  
11.  I. Malico and J. C. F. Pereira, “Numerical Study on the Influence of Radiative Properties in Porous Media Combustion”, J. Heat Transfer, 123, 2001, pp. 951-957.
12.  M. M. Keshtkar and S. A. Gandgalikhan Nassab, “Theoretical Analysis of Porous Radiant Burners
   under 2-D Radiation Field using Discrete Ordinates Method,” J. Quantitative Spectroscopy & Radiative Transfer, 32, 2009, pp.117-125. 
13.  S. A. Gandjalikhan Nassab and M. Fallah, “Study of Energy Recovery by Means of Porous Media Considering Gas Radiation Effect,” Proc. Instn. Mech. Engrs, part A: J. Power and Energy, 220, 2006, pp. 509-513. 
14.  S. A. Gandjalikhan Nassab and M. Maramisaran, “Transient Numerical Analysis of a Multi-Layered Porous Heat Exchanger Including Gas Radiation Effect”, J. Thermal Sciences, 48, 2009, pp. 1586-1595.
15.  M. F. Modest, Radiative Heat Transfer, McGraw-Hill, New York, USA, 1993.
16.  C. Ben Kheder, B. Cherif and M. S. Sifaaoui, “Numerical Study of Transient Heat Transfer in Semitransparent Porous Medium”, J. Renewable energy, 27, 2002, pp. 543-560.
17.  G. Oladed, Etude theorique et experimental du chaffage d’ un gas s’ ecoulant a travers un materiau poreux soumis au rayonnement solaire concentre, PhD thesis, University of Perpignan, France, 1981.
18.  S. A. Gandjalikhan Nassab and M. Fallah, “Study of Energy Recovery by Means of Porous Media Considering Gas Radiation Effect,” J. Power and Energt-Part A, 220, 2006, pp. 509-513.