Experimental investigation of free convection heat transfer with entrance restriction placed at top of a vertical circular tube

Mohammed, H. and Yusaf, T. and Salman, Y. (2006) Experimental investigation of free convection heat transfer with entrance restriction placed at top of a vertical circular tube. In: 8th Biennial ASME Conference on Engineering Systems Design and Analysis (ESDA 2006), 4-7 Jul 2006, Torino, Italy.

Abstract

A free convection from the inside surface of vertical circular tube with a uniformly heated surface (constant wall heat flux) was investigated experimentally for laminar air flow in the ranges of RaL from 6.9 × 108 to 5 × 109. The effect of restriction lengths placed at top position of the heated tube on the surface temperature distribution and the local and average heat transfer coefficient were studied. The experimental apparatus consists of aluminum tube with 900mm length and 30mm inside diameter. The entry restrictions were included a circular tube of same diameter as the heated tube but with different lengths of 60cm, 90cm, 120cm, 150cm, and 180cm. It was found that the surface temperature along the tube surface higher values for restriction with length of 180cm and smaller values for the restriction with length of 120cm. The results showed that the local Nux and average Nusselt number Nu were higher values for the restriction with length of 120cm and smaller values for the restriction with length of 180cm. The results obtained are correlated by dimensionless groups as Log L Nu against Log L Ra for each case and proposed a general correlation for all cases.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2006 by ASME. ESDA2006-95229. Permanent restricted access to paper due to publisher copyright restrictions.
Depositing User: Dr Talal Yusaf
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 11 Oct 2007 00:47
Last Modified: 21 Nov 2013 02:41
Uncontrolled Keywords: experimental free convection; entrance restriction; top position; vertical circular tube
Fields of Research (FOR2008): 09 Engineering > 0915 Interdisciplinary Engineering > 091508 Turbulent Flows
09 Engineering > 0902 Automotive Engineering > 090202 Automotive Engineering Materials
09 Engineering > 0915 Interdisciplinary Engineering > 091502 Computational Heat Transfer
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: doi: 10.1115/ESDA2006-95229
URI: http://eprints.usq.edu.au/id/eprint/1581

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