Enhancement of Heat Exchanger Performance by Using Dimpled Tube

The enhancement of heat exchanger performance was investigated using dimpled tubes tested at different Reynolds numbers, in the present work four types of dimpled tubes with a specified configuration manufactured, tested and then compared performance with the smooth tube and other passive technique...

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Autor principal:	Falah F. F. Al-Jabery
Formato:	article
Lenguaje:	EN
Publicado:	Al-Khwarizmi College of Engineering – University of Baghdad 2019
Materias:	Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/a477fe69e3d046b6a736fd2bcfbea53e
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spelling	oai:doaj.org-article:a477fe69e3d046b6a736fd2bcfbea53e2021-12-02T05:27:14ZEnhancement of Heat Exchanger Performance by Using Dimpled Tube10.22153/kej.2017.05.0021818-11712312-0789https://doaj.org/article/a477fe69e3d046b6a736fd2bcfbea53e2019-03-01T00:00:00Zhttp://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/409https://doaj.org/toc/1818-1171https://doaj.org/toc/2312-0789 The enhancement of heat exchanger performance was investigated using dimpled tubes tested at different Reynolds numbers, in the present work four types of dimpled tubes with a specified configuration manufactured, tested and then compared performance with the smooth tube and other passive techniques performance. Two dimpled arrangements along the tube were investigated, these are inline and staggered at constant pitch ratio X/d=4, the test results showed that Nusselts number (heat transfer) of the staggered array is higher than the inline array by 13%. The effect of different depths of the dimple (14.5 mm and 18.5 mm) has been also investigated; a tube with large dimple diameter enhanced the Nusselts number by about 25% for the range of Reynolds number between 4000- 20000. The overall enhancement ratio was used to differentiate the passive technique and comparison of different configurations for the technique itself, the result depicted that the 10 mm dimple diameter with a pitch ratio of X/d= 4 gives better performance than the static mixer and twisted tape techniques. The overall enhancement ratio of the 10 mm dimple diameter is varied from (1.21 to 1.65) that means good performance for a range of Reynolds numbers (4000-20000). This indicates that 21- 65 % of heat transfer area can be saved at the same pumping power compared with the smooth tube heat exchanger. Falah F. F. Al-JaberyAl-Khwarizmi College of Engineering – University of BaghdadarticleChemical engineeringTP155-156Engineering (General). Civil engineering (General)TA1-2040ENAl-Khawarizmi Engineering Journal, Vol 13, Iss 4 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040 Falah F. F. Al-Jabery Enhancement of Heat Exchanger Performance by Using Dimpled Tube
description	The enhancement of heat exchanger performance was investigated using dimpled tubes tested at different Reynolds numbers, in the present work four types of dimpled tubes with a specified configuration manufactured, tested and then compared performance with the smooth tube and other passive techniques performance. Two dimpled arrangements along the tube were investigated, these are inline and staggered at constant pitch ratio X/d=4, the test results showed that Nusselts number (heat transfer) of the staggered array is higher than the inline array by 13%. The effect of different depths of the dimple (14.5 mm and 18.5 mm) has been also investigated; a tube with large dimple diameter enhanced the Nusselts number by about 25% for the range of Reynolds number between 4000- 20000. The overall enhancement ratio was used to differentiate the passive technique and comparison of different configurations for the technique itself, the result depicted that the 10 mm dimple diameter with a pitch ratio of X/d= 4 gives better performance than the static mixer and twisted tape techniques. The overall enhancement ratio of the 10 mm dimple diameter is varied from (1.21 to 1.65) that means good performance for a range of Reynolds numbers (4000-20000). This indicates that 21- 65 % of heat transfer area can be saved at the same pumping power compared with the smooth tube heat exchanger.
format	article
author	Falah F. F. Al-Jabery
author_facet	Falah F. F. Al-Jabery
author_sort	Falah F. F. Al-Jabery
title	Enhancement of Heat Exchanger Performance by Using Dimpled Tube
title_short	Enhancement of Heat Exchanger Performance by Using Dimpled Tube
title_full	Enhancement of Heat Exchanger Performance by Using Dimpled Tube
title_fullStr	Enhancement of Heat Exchanger Performance by Using Dimpled Tube
title_full_unstemmed	Enhancement of Heat Exchanger Performance by Using Dimpled Tube
title_sort	enhancement of heat exchanger performance by using dimpled tube
publisher	Al-Khwarizmi College of Engineering – University of Baghdad
publishDate	2019
url	https://doaj.org/article/a477fe69e3d046b6a736fd2bcfbea53e
work_keys_str_mv	AT falahffaljabery enhancementofheatexchangerperformancebyusingdimpledtube
_version_	1718400432669196288

Enhancement of Heat Exchanger Performance by Using Dimpled Tube

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