In this paper, a numerical study of a 2-D combined convection-radiation heat transfer in a horizontal rectangular duct with two sudden contractions is presented. Contractions in duct are created by two inclined forward facing steps. To simulate the incline surfaces of the FFS, the blocked- off method was employed for both fluid mechanic and radiation problems. The fluid was treated as a gray, absorbing, emitting and scattering medium. To solve the governing equations, the 2-D Cartesian coordinate system was used. These equations were solved numerically, using the CFD techniques and SIMPLE algorithm. For computation of radiative term in energy equation, the radiative transfer equation (RTE) was solved numerically by discrete ordinates method (DOM) to find the divergence of radiative heat flux distribution. The effects of optical thickness, radiation-conduction parameter and albedo coefficient on heat transfer behavior of the system were carried out. Comparison of numerical results with available credential data shows good consistency.
Schlichting, H., “Boundary Layer Theory” ,7th Ed., McGraw-Hill, New York, 1979.
Shah, R. and London, A., “Laminar Flow Force Convection in Duct”, Ed., Academic Press, New York, 1978.
Erturk, E., “Numerical Solutions of 2-D Steady Incompressible Flow over a Backward- Facing Step, Part I: High Reynolds Number Solutions”, Computers & Fluids, Vol. 37, pp.633–655, 2008.
Armaly, B.F., Li, A., and Nie, J.H. “Measurements in Three-Dimensional Laminar Separated Flow”, Int. J. Heat and Mass Transfer, Vol. 46, pp. 3573–3582, 2003.
Abu-Mulaweh, H.I. “A Review of Research on Laminar Mixed Convection Flow over Backward- and Forward-Facing Steps”, Int. J. Thermal Sciences, Vol. 42, pp. 897–909, 2003.
Gandjalikhan Nassab, S.A., Moosavi, R., and Hosseini Sarvari S.M. “Turbulent Forced Convection Flow Adjacent to Inclined Forward Step in a Duct”, Int. J. Thermal Sciences, Vol. 48, pp.1319–1326, 2009.
Viskanta, R., “Overview of Convection and Radiation in High Temperature”, Int. J. Eng. Science, Vol. 36, pp. 1677-1699, 1998.
Barhaghi, D.G. and Davidson, L., “Large-Eddy Simulation of Mixed Convection-Radiation Heat Transfer in a Vertical Channel”, Int. J. Heat and Mass Transfer, Vol. 52, pp. 3918–3928, 2009.
Grosan, T. and Pop, I., “Thermal Radiation Effect on Fully Developed Mixed Convection Flow in a Vertical Channel”, Technische Mechanik, Vol. 27, No. 1, pp. 37-47, 2007.
Chiu, H.C., Jang, J.H., and Yan, W.M., “Mixed Convection Heat Transfer in Horizontal Rectangular Ducts with Radiation Effects”, Int. J. Heat and Mass Transfer, Vol. 50, pp. 2874–2882, 2007.
Chiu, H.C. and Yan W.M., “Mixed Convection Heat Transfer in Inclined Rectangular, Ducts with Radiation Effects”, Int. J. Heat and Mass Transfer, Vol. 51, pp. 1085–1094, 2008.
Ansari, B. and Gandjalikhan Nassab, S.A., “Thermal Characteristics of Convective Flows Encountered In A 2-D Backward Facing Step under the Effect of Radiative Heat Transfer”, Int. Review of Mechanical Engineering, Vol. 4, No. 6, pp. 711-718, 2010.
Ansari, B. and Gandjalikhan Nassab, S.A., “Study of Laminar Forced Convection of Radiating Gas over an Inclined Backward Facing Step under Bleeding Condition, Using the Blocked-off Method”, ASME, J. Heat Transfer, Vol. 133, No. 7, 2011.
Ansari, B. and Gandjalikhan Nassab, S.A., "Numerical Analysis of Laminar Forced Convection Flow of a Radiating Gas over an Inclined Forward Facing Step", Int. Review of Mech. Eng., Vol. 5, No. 1, pp. 120–127, 2011.
Atashafrooz, M. and Gandjalikhan Nassab, S.A., “Numerical Analysis of Laminar Forced Convection Recess Flow with Two Inclined Steps Considering Gas Radiation Effect, Computers & Fluids”, Vol. 66, pp.167-176, 2012.
Atashafrooz, M. and Gandjalikhan Nassab S.A., “Simulation of Three-dimensional Laminar Forced Convection Flow of a Radiating Gas over an Inclined Backward-Facing Step in a Duct under Bleeding Condition, Institution of Mechanical Engineers, Part C”, Journal of Mech. Eng. Science, Vol. 227, No. 2, pp. 332-345, 2012.
Atashafrooz, M. and Gandjalikhan Nassab, S.A., “Combined Heat Transfer of Radiation and Forced Convection Flow of Participating Gases in a Three-dimensional Recess”, J. Mech. Science and Tech., Vol. 26, No. 1, pp. 3357-3368, 2012.
Atashafrooz, M., Gandjalikhan Nassab, S.A. and Lari, K. “Numerical Study of Couplenon-Gray Radiation And Separation Convection Flow In A Duct, Using The FSK Method”, Int. J. Advanced Design and Manufacturing Tech., Vol. 9, N. 4, pp. 23-38, 2016.
Atashafrooz, M., Gandjalikhan Nassab, S.A. and Behineh, E.S. “Effects of Baffle on Separated Convection Step Flow of Radiating Gas in a Duct”, Int. J. Advanced Design and Manufacturing Technology, Vol. 8, No. 3, pp. 33-47, 2015.
M. F., Modest, Radiative Heat Transfer, McGraw-Hill, New York, 2003.
dehghani rayni, A., & ganjali nasab, A. (2017). Numerical Simulation of Forced Convection Duct Flow of a Radiating
Gas with Separation. Fluid Mechanics & Aerodynamics, 6(1), 53-66.
MLA
abbas dehghani rayni; abdolreza ganjali nasab. "Numerical Simulation of Forced Convection Duct Flow of a Radiating
Gas with Separation". Fluid Mechanics & Aerodynamics, 6, 1, 2017, 53-66.
HARVARD
dehghani rayni, A., ganjali nasab, A. (2017). 'Numerical Simulation of Forced Convection Duct Flow of a Radiating
Gas with Separation', Fluid Mechanics & Aerodynamics, 6(1), pp. 53-66.
VANCOUVER
dehghani rayni, A., ganjali nasab, A. Numerical Simulation of Forced Convection Duct Flow of a Radiating
Gas with Separation. Fluid Mechanics & Aerodynamics, 2017; 6(1): 53-66.
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