The Effect of Restriction Shape On Laminar Natural Convection Heat Transfer InA Vertical Circular Tube

Natural convection heat transfer is experimentally investigated for laminar air flow in a vertical circular tube by using the boundary condition of constant wall heat flux in the ranges of (RaL) from (1.1*109) to (4.7*109). The experimental set-up was designed for determining the effect of different...

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Autores principales:	Hussein Ahmed Mohammed, Dr. Yasin K. Salman
Formato:	article
Lenguaje:	EN
Publicado:	Al-Khwarizmi College of Engineering – University of Baghdad 2005
Materias:	Restriction Shape Laminar Natural Convection Heat Transfer Vertical Circular Tube. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/7578e99bf4894439853fe84c0bc2d3f2
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spelling	oai:doaj.org-article:7578e99bf4894439853fe84c0bc2d3f22021-12-02T07:35:48ZThe Effect of Restriction Shape On Laminar Natural Convection Heat Transfer InA Vertical Circular Tube1818-1171https://doaj.org/article/7578e99bf4894439853fe84c0bc2d3f22005-01-01T00:00:00Zhttp://www.iasj.net/iasj?func=fulltext&aId=2262https://doaj.org/toc/1818-1171Natural convection heat transfer is experimentally investigated for laminar air flow in a vertical circular tube by using the boundary condition of constant wall heat flux in the ranges of (RaL) from (1.1109) to (4.7109). The experimental set-up was designed for determining the effect of different types of restrictions placed at entry of heated tube in bottom position, on the surface temperature distribution and on the local and average heat transfer coefficients. The apparatus was made with an electrically heated cylinder of a length (900mm) and diameter (30mm). The entry restrictions were included a circular tube of same diameter as the heated cylinder but with lengths of (60cm, 120cm), sharp-edge and bell-mouth. The surface temperature along the cylinder surface for same heat flux would be higher values for circular restriction with length of (120cm) and would be smaller values for bell-mouth restriction. The results show that the local Nusselt number (Nux) and average Nusselt number are higher for bell-mouth restriction and smaller values for (120cm) restriction. For all entry shape restrictions, the results show that the Nusselt number values increases as the heat flux increases. From the present work an empirical correlations were obtained in a form of (Log ) versus (Log ) for each case investigated and obtained a general correlation for all cases which reveals the effect of restriction existence on the natural convection heat transfer process in a vertical circular tube.Hussein Ahmed MohammedDr. Yasin K. SalmanAl-Khwarizmi College of Engineering – University of BaghdadarticleRestriction ShapeLaminar Natural ConvectionHeat TransferVertical Circular Tube.Chemical engineeringTP155-156Engineering (General). Civil engineering (General)TA1-2040ENAl-Khawarizmi Engineering Journal, Vol 1, Iss 1, Pp 83-100 (2005)
institution	DOAJ
collection	DOAJ
language	EN
topic	Restriction Shape Laminar Natural Convection Heat Transfer Vertical Circular Tube. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Restriction Shape Laminar Natural Convection Heat Transfer Vertical Circular Tube. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040 Hussein Ahmed Mohammed Dr. Yasin K. Salman The Effect of Restriction Shape On Laminar Natural Convection Heat Transfer InA Vertical Circular Tube
description	Natural convection heat transfer is experimentally investigated for laminar air flow in a vertical circular tube by using the boundary condition of constant wall heat flux in the ranges of (RaL) from (1.1109) to (4.7109). The experimental set-up was designed for determining the effect of different types of restrictions placed at entry of heated tube in bottom position, on the surface temperature distribution and on the local and average heat transfer coefficients. The apparatus was made with an electrically heated cylinder of a length (900mm) and diameter (30mm). The entry restrictions were included a circular tube of same diameter as the heated cylinder but with lengths of (60cm, 120cm), sharp-edge and bell-mouth. The surface temperature along the cylinder surface for same heat flux would be higher values for circular restriction with length of (120cm) and would be smaller values for bell-mouth restriction. The results show that the local Nusselt number (Nux) and average Nusselt number are higher for bell-mouth restriction and smaller values for (120cm) restriction. For all entry shape restrictions, the results show that the Nusselt number values increases as the heat flux increases. From the present work an empirical correlations were obtained in a form of (Log ) versus (Log ) for each case investigated and obtained a general correlation for all cases which reveals the effect of restriction existence on the natural convection heat transfer process in a vertical circular tube.
format	article
author	Hussein Ahmed Mohammed Dr. Yasin K. Salman
author_facet	Hussein Ahmed Mohammed Dr. Yasin K. Salman
author_sort	Hussein Ahmed Mohammed
title	The Effect of Restriction Shape On Laminar Natural Convection Heat Transfer InA Vertical Circular Tube
title_short	The Effect of Restriction Shape On Laminar Natural Convection Heat Transfer InA Vertical Circular Tube
title_full	The Effect of Restriction Shape On Laminar Natural Convection Heat Transfer InA Vertical Circular Tube
title_fullStr	The Effect of Restriction Shape On Laminar Natural Convection Heat Transfer InA Vertical Circular Tube
title_full_unstemmed	The Effect of Restriction Shape On Laminar Natural Convection Heat Transfer InA Vertical Circular Tube
title_sort	effect of restriction shape on laminar natural convection heat transfer ina vertical circular tube
publisher	Al-Khwarizmi College of Engineering – University of Baghdad
publishDate	2005
url	https://doaj.org/article/7578e99bf4894439853fe84c0bc2d3f2
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The Effect of Restriction Shape On Laminar Natural Convection Heat Transfer InA Vertical Circular Tube

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