Parametric Study of Mixed Convective RadiativeHeat Transfer in an Inclined Annulus

The steady state laminar mixed convection and radiation through inclined rectangular duct with an interior circular tube is investigated numerically for a thermally and hydrodynamicaly fully developed flow. The two heat transfer mechanisms of convection and radiation are treated independently and si...

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Autores principales:	Raed G. Saihood, Manal H. Al-Hafidh
Formato:	article
Lenguaje:	EN
Publicado:	Al-Khwarizmi College of Engineering – University of Baghdad 2008
Materias:	Mixed Convection Radiation Rectangular Duct Circular Tube Laminar Flow. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/0c4770c4039b4fb3b464edc35e28ed44
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spelling	oai:doaj.org-article:0c4770c4039b4fb3b464edc35e28ed442021-12-02T01:52:26ZParametric Study of Mixed Convective RadiativeHeat Transfer in an Inclined Annulus1818-1171https://doaj.org/article/0c4770c4039b4fb3b464edc35e28ed442008-01-01T00:00:00Zhttp://www.iasj.net/iasj?func=fulltext&aId=2185https://doaj.org/toc/1818-1171The steady state laminar mixed convection and radiation through inclined rectangular duct with an interior circular tube is investigated numerically for a thermally and hydrodynamicaly fully developed flow. The two heat transfer mechanisms of convection and radiation are treated independently and simultaneously. The governing equations which used are continuity, momentum and energy equations. These equations are normalized and solved using the Vorticity-Stream function and the Body Fitted Coordinates (B.F.C) methods. The finite difference approach with the Line Successive Over-Relaxation (LSOR) method is used to obtain all the computational results. The (B.F.C) method is used to generate the grid of the problem. A computer program (Fortran 90) is built to calculate the steady state Nusselt number (Nu) for Aspect Ratio AR (0.55-1) and Geometry Ratio GR (0.1-0.9). The fluid Prandtl number is 0.7, Rayleigh number Ra = 400, Reynolds number Re = 100, Optical Thickness (0 ≤ t ≤ 10), Conduction- Radiation parameter (0 ≤ N ≤ 100) and Inclination angle λ = 45. For the range of parameters considered, results show that radiation enhance heat transfer. It is also indicated in the results that heat transfer from the surface of the circle exceeds that of the rectangular duct. Generally, Nu is increased with increasing GR, t and N but it decreased with AR increase. When the radiation effect added to the heat transfer mechanism, the heat transfer rate increased. This effect increased with increasing in GR and decreasing with AR. The increasing in radiation properties lead to increase the radiation effect. Tecplot 7 program was used to plot the curves which cleared these relations and isotherms and streamlines which illustrate the behavior of air through the channel and its variation with other parameters. A correlation equation is concluded to describe the radiation effect. Comparison of the results with the previous work shows a good agreement.Raed G. SaihoodManal H. Al-HafidhAl-Khwarizmi College of Engineering – University of BaghdadarticleMixed ConvectionRadiationRectangular DuctCircular TubeLaminar Flow.Chemical engineeringTP155-156Engineering (General). Civil engineering (General)TA1-2040ENAl-Khawarizmi Engineering Journal, Vol 4, Iss 4, Pp 45-46 (2008)
institution	DOAJ
collection	DOAJ
language	EN
topic	Mixed Convection Radiation Rectangular Duct Circular Tube Laminar Flow. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Mixed Convection Radiation Rectangular Duct Circular Tube Laminar Flow. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040 Raed G. Saihood Manal H. Al-Hafidh Parametric Study of Mixed Convective RadiativeHeat Transfer in an Inclined Annulus
description	The steady state laminar mixed convection and radiation through inclined rectangular duct with an interior circular tube is investigated numerically for a thermally and hydrodynamicaly fully developed flow. The two heat transfer mechanisms of convection and radiation are treated independently and simultaneously. The governing equations which used are continuity, momentum and energy equations. These equations are normalized and solved using the Vorticity-Stream function and the Body Fitted Coordinates (B.F.C) methods. The finite difference approach with the Line Successive Over-Relaxation (LSOR) method is used to obtain all the computational results. The (B.F.C) method is used to generate the grid of the problem. A computer program (Fortran 90) is built to calculate the steady state Nusselt number (Nu) for Aspect Ratio AR (0.55-1) and Geometry Ratio GR (0.1-0.9). The fluid Prandtl number is 0.7, Rayleigh number Ra = 400, Reynolds number Re = 100, Optical Thickness (0 ≤ t ≤ 10), Conduction- Radiation parameter (0 ≤ N ≤ 100) and Inclination angle λ = 45. For the range of parameters considered, results show that radiation enhance heat transfer. It is also indicated in the results that heat transfer from the surface of the circle exceeds that of the rectangular duct. Generally, Nu is increased with increasing GR, t and N but it decreased with AR increase. When the radiation effect added to the heat transfer mechanism, the heat transfer rate increased. This effect increased with increasing in GR and decreasing with AR. The increasing in radiation properties lead to increase the radiation effect. Tecplot 7 program was used to plot the curves which cleared these relations and isotherms and streamlines which illustrate the behavior of air through the channel and its variation with other parameters. A correlation equation is concluded to describe the radiation effect. Comparison of the results with the previous work shows a good agreement.
format	article
author	Raed G. Saihood Manal H. Al-Hafidh
author_facet	Raed G. Saihood Manal H. Al-Hafidh
author_sort	Raed G. Saihood
title	Parametric Study of Mixed Convective RadiativeHeat Transfer in an Inclined Annulus
title_short	Parametric Study of Mixed Convective RadiativeHeat Transfer in an Inclined Annulus
title_full	Parametric Study of Mixed Convective RadiativeHeat Transfer in an Inclined Annulus
title_fullStr	Parametric Study of Mixed Convective RadiativeHeat Transfer in an Inclined Annulus
title_full_unstemmed	Parametric Study of Mixed Convective RadiativeHeat Transfer in an Inclined Annulus
title_sort	parametric study of mixed convective radiativeheat transfer in an inclined annulus
publisher	Al-Khwarizmi College of Engineering – University of Baghdad
publishDate	2008
url	https://doaj.org/article/0c4770c4039b4fb3b464edc35e28ed44
work_keys_str_mv	AT raedgsaihood parametricstudyofmixedconvectiveradiativeheattransferinaninclinedannulus AT manalhalhafidh parametricstudyofmixedconvectiveradiativeheattransferinaninclinedannulus
_version_	1718402815173328896

Parametric Study of Mixed Convective RadiativeHeat Transfer in an Inclined Annulus

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