Investigation of Thermal-Hydraulic Performance in Flat Tube Heat Exchangers at Various Tube Inclination Angles

The performance of compact fin-and-flat tube heat exchangers (HE) can be affected by many geometrical and processing factors and one of them is tube inclination angle. However, the effect of flat tube inclination angle on the thermal-hydraulic performance of the HE is not fully examined. This pa...

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Main Authors:	A. Y., Adam, A. N., Oumer, Azri, Alias, M., Ishak, M. M., Noor
Format:	Article
Language:	English
Published:	Universiti Malaysia Pahang 2017
Online Access:	http://umpir.ump.edu.my/id/eprint/20243/ http://umpir.ump.edu.my/id/eprint/20243/ http://umpir.ump.edu.my/id/eprint/20243/ http://umpir.ump.edu.my/id/eprint/20243/1/fkm-2017-oumer-Investigation%20of%20Thermal-Hydraulic%20Performance%20in%20Flat%20Tube.pdf

id	ump-20243
recordtype	eprints
spelling	ump-202432018-01-19T08:00:43Z http://umpir.ump.edu.my/id/eprint/20243/ Investigation of Thermal-Hydraulic Performance in Flat Tube Heat Exchangers at Various Tube Inclination Angles A. Y., Adam A. N., Oumer Azri, Alias M., Ishak M. M., Noor The performance of compact fin-and-flat tube heat exchangers (HE) can be affected by many geometrical and processing factors and one of them is tube inclination angle. However, the effect of flat tube inclination angle on the thermal-hydraulic performance of the HE is not fully examined. This paper investigates the effects of flat tube inclination angles on heat transfer and pressure drop characteristics of fined flat tube HE when the tubes are deployed in in-line and staggered arrangements. A symmetric numerical method based on FLUENT software was carried out with six different tube inclination angles (0°, 30°, 60°, 90°, 120°, and 150°) in moderately high Reynolds number. From the results, it was observed that heat transfer coefficient increased with the augmentation of the tube inclination angle from 0o to 90o and decreased for 120o and 150o. With the increase of tube inclination angle, the average Nusselt number rose by 36.3%. This might be due to the reason that the tube surface area increases with the inclination angle, which also results in the largest increment of the pressure drop by 42.0%. Overall, the 90o tube inclination angle showed the highest enhancement in heat transfer for both inline and staggered configurations with a maximum enhancement of 41.2% for in-line and 32.2% for staggered arrangements. However, the heat transfer enhancements were accompanied by high-pressure drop penalties of up to 44.2% and 42.6% for in-line and staggered arrangements, respectively. Therefore, inclining the tubes at 90o is recommended where high heat transfer is required. On the other hand, 0o tube inclination angle is recommended where pumping power is a crucial issue. Universiti Malaysia Pahang 2017 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/20243/1/fkm-2017-oumer-Investigation%20of%20Thermal-Hydraulic%20Performance%20in%20Flat%20Tube.pdf A. Y., Adam and A. N., Oumer and Azri, Alias and M., Ishak and M. M., Noor (2017) Investigation of Thermal-Hydraulic Performance in Flat Tube Heat Exchangers at Various Tube Inclination Angles. International Journal of Automotive and Mechanical Engineering (IJAME), 14 (3). pp. 4542-4560. ISSN 1985-9325(Print); 2180-1606 (Online) https://doi.org/10.15282/ijame.14.3.2017.12.0359 doi: 10.15282/ijame.14.3.2017.12.0359
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
description	The performance of compact fin-and-flat tube heat exchangers (HE) can be affected by many geometrical and processing factors and one of them is tube inclination angle. However, the effect of flat tube inclination angle on the thermal-hydraulic performance of the HE is not fully examined. This paper investigates the effects of flat tube inclination angles on heat transfer and pressure drop characteristics of fined flat tube HE when the tubes are deployed in in-line and staggered arrangements. A symmetric numerical method based on FLUENT software was carried out with six different tube inclination angles (0°, 30°, 60°, 90°, 120°, and 150°) in moderately high Reynolds number. From the results, it was observed that heat transfer coefficient increased with the augmentation of the tube inclination angle from 0o to 90o and decreased for 120o and 150o. With the increase of tube inclination angle, the average Nusselt number rose by 36.3%. This might be due to the reason that the tube surface area increases with the inclination angle, which also results in the largest increment of the pressure drop by 42.0%. Overall, the 90o tube inclination angle showed the highest enhancement in heat transfer for both inline and staggered configurations with a maximum enhancement of 41.2% for in-line and 32.2% for staggered arrangements. However, the heat transfer enhancements were accompanied by high-pressure drop penalties of up to 44.2% and 42.6% for in-line and staggered arrangements, respectively. Therefore, inclining the tubes at 90o is recommended where high heat transfer is required. On the other hand, 0o tube inclination angle is recommended where pumping power is a crucial issue.
format	Article
author	A. Y., Adam A. N., Oumer Azri, Alias M., Ishak M. M., Noor
spellingShingle	A. Y., Adam A. N., Oumer Azri, Alias M., Ishak M. M., Noor Investigation of Thermal-Hydraulic Performance in Flat Tube Heat Exchangers at Various Tube Inclination Angles
author_facet	A. Y., Adam A. N., Oumer Azri, Alias M., Ishak M. M., Noor
author_sort	A. Y., Adam
title	Investigation of Thermal-Hydraulic Performance in Flat Tube Heat Exchangers at Various Tube Inclination Angles
title_short	Investigation of Thermal-Hydraulic Performance in Flat Tube Heat Exchangers at Various Tube Inclination Angles
title_full	Investigation of Thermal-Hydraulic Performance in Flat Tube Heat Exchangers at Various Tube Inclination Angles
title_fullStr	Investigation of Thermal-Hydraulic Performance in Flat Tube Heat Exchangers at Various Tube Inclination Angles
title_full_unstemmed	Investigation of Thermal-Hydraulic Performance in Flat Tube Heat Exchangers at Various Tube Inclination Angles
title_sort	investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles
publisher	Universiti Malaysia Pahang
publishDate	2017
url	http://umpir.ump.edu.my/id/eprint/20243/ http://umpir.ump.edu.my/id/eprint/20243/ http://umpir.ump.edu.my/id/eprint/20243/ http://umpir.ump.edu.my/id/eprint/20243/1/fkm-2017-oumer-Investigation%20of%20Thermal-Hydraulic%20Performance%20in%20Flat%20Tube.pdf
first_indexed	2023-09-18T22:29:04Z
last_indexed	2023-09-18T22:29:04Z
_version_	1777416163477684224

Investigation of Thermal-Hydraulic Performance in Flat Tube Heat Exchangers at Various Tube Inclination Angles

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