Free Convective Heat Transfer with Different Sections Lengths Placed at the Exit of a Vertical Circular Tube subjected to a Constant Heat Flux

A free convective heat transfer from the inside surface of a uniformly heated vertical circular tube has been experimentally investigated under a constant wall heat flux boundary condition for laminar air flow in the ranges of RaL from 6.9 108 to 5 109. The effect of the different sections (restrict...

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Autores principales:	Hussein A. Mohammed, Yasin K. Salman
Formato:	article
Lenguaje:	EN
Publicado:	Al-Khwarizmi College of Engineering – University of Baghdad 2007
Materias:	Experimental study; Free Convective; Different sections length; Vertical Circular Tube; Constant Heat Flux. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/700c8e1161144b2f8e10754f59899ba1
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spelling	oai:doaj.org-article:700c8e1161144b2f8e10754f59899ba12021-12-02T06:43:41ZFree Convective Heat Transfer with Different Sections Lengths Placed at the Exit of a Vertical Circular Tube subjected to a Constant Heat Flux1818-1171https://doaj.org/article/700c8e1161144b2f8e10754f59899ba12007-01-01T00:00:00Zhttp://www.iasj.net/iasj?func=fulltext&aId=2363https://doaj.org/toc/1818-1171A free convective heat transfer from the inside surface of a uniformly heated vertical circular tube has been experimentally investigated under a constant wall heat flux boundary condition for laminar air flow in the ranges of RaL from 6.9 108 to 5 109. The effect of the different sections (restrictions) lengths placed at the exit of the heated tube on the surface temperature distribution, the local and average heat transfer coefficients were examined. The experimental apparatus consists of aluminum circular tube with 900 mm length and 30 mm inside diameter (L/D=30). The exit sections (restrictions) were included circular tubes having the same inside diameter as the heated tube but with different lengths of 600 mm (L/D=20), 900 mm (L/D=30), 1200 mm (L/D=40), 1500 mm (L/D=50), and 1800 mm (L/D=60). It was found that the surface temperature along the tube axial distance would be higher for restriction with length of 1800 mm (L/D=60) and it would be smaller for the restriction with length of 1200 mm (L/D=40). The results show that the local Nux and average Nusselt number were higher values for the restriction with length of 1200 mm (L/D=40) and smaller values for the restriction with length of 1800 mm (L/D=60). The results were correlated with empirical equations and presented as Log against Log for each case investigated and a general empirical equation was proposed for all cases. Hussein A. MohammedYasin K. SalmanAl-Khwarizmi College of Engineering – University of BaghdadarticleExperimental study; Free Convective; Different sections length; Vertical Circular Tube; Constant Heat Flux.Chemical engineeringTP155-156Engineering (General). Civil engineering (General)TA1-2040ENAl-Khawarizmi Engineering Journal, Vol 3, Iss 3, Pp 31-52 (2007)
institution	DOAJ
collection	DOAJ
language	EN
topic	Experimental study; Free Convective; Different sections length; Vertical Circular Tube; Constant Heat Flux. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Experimental study; Free Convective; Different sections length; Vertical Circular Tube; Constant Heat Flux. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040 Hussein A. Mohammed Yasin K. Salman Free Convective Heat Transfer with Different Sections Lengths Placed at the Exit of a Vertical Circular Tube subjected to a Constant Heat Flux
description	A free convective heat transfer from the inside surface of a uniformly heated vertical circular tube has been experimentally investigated under a constant wall heat flux boundary condition for laminar air flow in the ranges of RaL from 6.9 108 to 5 109. The effect of the different sections (restrictions) lengths placed at the exit of the heated tube on the surface temperature distribution, the local and average heat transfer coefficients were examined. The experimental apparatus consists of aluminum circular tube with 900 mm length and 30 mm inside diameter (L/D=30). The exit sections (restrictions) were included circular tubes having the same inside diameter as the heated tube but with different lengths of 600 mm (L/D=20), 900 mm (L/D=30), 1200 mm (L/D=40), 1500 mm (L/D=50), and 1800 mm (L/D=60). It was found that the surface temperature along the tube axial distance would be higher for restriction with length of 1800 mm (L/D=60) and it would be smaller for the restriction with length of 1200 mm (L/D=40). The results show that the local Nux and average Nusselt number were higher values for the restriction with length of 1200 mm (L/D=40) and smaller values for the restriction with length of 1800 mm (L/D=60). The results were correlated with empirical equations and presented as Log against Log for each case investigated and a general empirical equation was proposed for all cases.
format	article
author	Hussein A. Mohammed Yasin K. Salman
author_facet	Hussein A. Mohammed Yasin K. Salman
author_sort	Hussein A. Mohammed
title	Free Convective Heat Transfer with Different Sections Lengths Placed at the Exit of a Vertical Circular Tube subjected to a Constant Heat Flux
title_short	Free Convective Heat Transfer with Different Sections Lengths Placed at the Exit of a Vertical Circular Tube subjected to a Constant Heat Flux
title_full	Free Convective Heat Transfer with Different Sections Lengths Placed at the Exit of a Vertical Circular Tube subjected to a Constant Heat Flux
title_fullStr	Free Convective Heat Transfer with Different Sections Lengths Placed at the Exit of a Vertical Circular Tube subjected to a Constant Heat Flux
title_full_unstemmed	Free Convective Heat Transfer with Different Sections Lengths Placed at the Exit of a Vertical Circular Tube subjected to a Constant Heat Flux
title_sort	free convective heat transfer with different sections lengths placed at the exit of a vertical circular tube subjected to a constant heat flux
publisher	Al-Khwarizmi College of Engineering – University of Baghdad
publishDate	2007
url	https://doaj.org/article/700c8e1161144b2f8e10754f59899ba1
work_keys_str_mv	AT husseinamohammed freeconvectiveheattransferwithdifferentsectionslengthsplacedattheexitofaverticalcirculartubesubjectedtoaconstantheatflux AT yasinksalman freeconvectiveheattransferwithdifferentsectionslengthsplacedattheexitofaverticalcirculartubesubjectedtoaconstantheatflux
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Free Convective Heat Transfer with Different Sections Lengths Placed at the Exit of a Vertical Circular Tube subjected to a Constant Heat Flux

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