Performance Enhancement of Double Pipe Heat Exchangers by Enforced Turbulence on Single Surface

Results are presented from Theoretical analysis for pressure drop and heat transfer in annular flow having repeated turbulators. The annular flow represents the outer part of counter flow in a double-pipe heat exchanger. The modeling enables estimation of the friction factor, Nusselt number and Stan...

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Main Authors: Al-Kayiem, Hussain H., Al-Habeeb, L.N.
Format: Conference or Workshop Item
Published: 2008
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Online Access:http://eprints.utp.edu.my/4158/1/Performance_Enhancement_of_a_Counter_Flow_Dopuble_Pipe_Heat_Exchanger_by_Enforced_Turbulence_on_Single_Surface.pdf
http://eprints.utp.edu.my/4158/
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spelling my.utp.eprints.41582017-01-19T08:26:23Z Performance Enhancement of Double Pipe Heat Exchangers by Enforced Turbulence on Single Surface Al-Kayiem, Hussain H. Al-Habeeb, L.N. TJ Mechanical engineering and machinery Results are presented from Theoretical analysis for pressure drop and heat transfer in annular flow having repeated turbulators. The annular flow represents the outer part of counter flow in a double-pipe heat exchanger. The modeling enables estimation of the friction factor, Nusselt number and Stanton number. The mathematical modeling is based on the law of the wall similarity to correlate both friction factor and heat transfer coefficient. The regime of hot water inside the inner pipe is investigated within a Reynolds number range from 10000 to 72000. The annular cold flow is ranging 26000 to 200000 Reynolds number. Four different types of promoter installations were tested. The results are verified by comparing with experiments. They are in good agreement. The results have shown enhancement in the heat transfer coefficient combined with increase in the friction factor. The performance index has shown highest enhancement of about 1.8 at pitch to diameter ratio equal 10 and promoter height to hydraulic diameter equal 0.0595 when the promoters are attached to inner surface of the outer pipe. Key words: Heat exchangers, heat transfer enhancement, ribbing, friction, Counter flow. 2008 Conference or Workshop Item PeerReviewed application/pdf http://eprints.utp.edu.my/4158/1/Performance_Enhancement_of_a_Counter_Flow_Dopuble_Pipe_Heat_Exchanger_by_Enforced_Turbulence_on_Single_Surface.pdf Al-Kayiem, Hussain H. and Al-Habeeb, L.N. (2008) Performance Enhancement of Double Pipe Heat Exchangers by Enforced Turbulence on Single Surface. In: International Conference on Plant Equipment and Reliability (ICPER), 28-29 March 2008, Sunway, Malaysia. http://eprints.utp.edu.my/4158/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Al-Kayiem, Hussain H.
Al-Habeeb, L.N.
Performance Enhancement of Double Pipe Heat Exchangers by Enforced Turbulence on Single Surface
description Results are presented from Theoretical analysis for pressure drop and heat transfer in annular flow having repeated turbulators. The annular flow represents the outer part of counter flow in a double-pipe heat exchanger. The modeling enables estimation of the friction factor, Nusselt number and Stanton number. The mathematical modeling is based on the law of the wall similarity to correlate both friction factor and heat transfer coefficient. The regime of hot water inside the inner pipe is investigated within a Reynolds number range from 10000 to 72000. The annular cold flow is ranging 26000 to 200000 Reynolds number. Four different types of promoter installations were tested. The results are verified by comparing with experiments. They are in good agreement. The results have shown enhancement in the heat transfer coefficient combined with increase in the friction factor. The performance index has shown highest enhancement of about 1.8 at pitch to diameter ratio equal 10 and promoter height to hydraulic diameter equal 0.0595 when the promoters are attached to inner surface of the outer pipe. Key words: Heat exchangers, heat transfer enhancement, ribbing, friction, Counter flow.
format Conference or Workshop Item
author Al-Kayiem, Hussain H.
Al-Habeeb, L.N.
author_facet Al-Kayiem, Hussain H.
Al-Habeeb, L.N.
author_sort Al-Kayiem, Hussain H.
title Performance Enhancement of Double Pipe Heat Exchangers by Enforced Turbulence on Single Surface
title_short Performance Enhancement of Double Pipe Heat Exchangers by Enforced Turbulence on Single Surface
title_full Performance Enhancement of Double Pipe Heat Exchangers by Enforced Turbulence on Single Surface
title_fullStr Performance Enhancement of Double Pipe Heat Exchangers by Enforced Turbulence on Single Surface
title_full_unstemmed Performance Enhancement of Double Pipe Heat Exchangers by Enforced Turbulence on Single Surface
title_sort performance enhancement of double pipe heat exchangers by enforced turbulence on single surface
publishDate 2008
url http://eprints.utp.edu.my/4158/1/Performance_Enhancement_of_a_Counter_Flow_Dopuble_Pipe_Heat_Exchanger_by_Enforced_Turbulence_on_Single_Surface.pdf
http://eprints.utp.edu.my/4158/
_version_ 1738655323111030784
score 13.18916