Thermal performance enhancement of a heat exchanger using metal chain as a novel turbulator

Enhancing heat transfer in a heat exchanger system is critical to many industrial applications. There are many problems that require in-depth studies to find solutions. One of the main problems is the poor heat transfer rate, due to the fluid flow behavior inside the tubes, and to increase the...

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Main Author:	Ghitheeth, Ali Hussein
Format:	Thesis
Language:	English English English
Published:	2021
Subjects:	T Technology (General) TJ255-265 Heat engines
Online Access:	http://eprints.uthm.edu.my/4129/1/24p%20ALI%20HUSSEIN%20GHITHEETH.pdf http://eprints.uthm.edu.my/4129/2/ALI%20HUSSEIN%20GHITHEETH%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/4129/3/ALI%20HUSSEIN%20GHITHEETH%20WATERMARK.pdf
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spelling	my-uthm-ep.41292022-02-03T02:32:14Z Thermal performance enhancement of a heat exchanger using metal chain as a novel turbulator 2021-04 Ghitheeth, Ali Hussein T Technology (General) TJ255-265 Heat engines Enhancing heat transfer in a heat exchanger system is critical to many industrial applications. There are many problems that require in-depth studies to find solutions. One of the main problems is the poor heat transfer rate, due to the fluid flow behavior inside the tubes, and to increase the heat transfer rate, the flow behavior inside the heat exchanger tubes must be changed. This study presents an experimental and numerical approach to enhance heat transfer in a heat exchanger tube using new types of turbulator (metal chains) inserted in the heat exchanger tube to change the flow behavior. Fifteen (15) configurations of metal chains were tested; three ratios of the wire diameter/tube diameter, (t/D = 0.1, 0.15 and 0.2), with five lengths of the chainrings represented by the ring length/tube diameter, (P/D = 1, 2, 3, 4 and 5). The experimental system (test rig) consisted of a 2000 mm thermal insulated carbon steel tube exchanger test section, in which the inner and outer diameters were 20 mm and 26 mm respectively. The fluid used was heavy fuel oil, with a fully developed turbulent flow, Reynolds number, (Re = 5000 to 15000), and uniform heat flux on the external wall of 6000-Watt. A 3D computational fluid dynamics calculation was also made to study the effect of metal chains on the fluid flow behavior inside the tubes on the overall thermal performance. Both experimental and simulation results showed that the insertion of the metal chain into the heat exchanger tube increases the thermal performance factor (η), the Nusselt number (Nu), and the friction factor (f). The thermal performance factor (η) decreased with the increase in Reynolds number for all cases. The highest thermal performance factor (η) was found at t/D = 0.15 and P/D = 3, while both the highest Nusselt number (Nu) and friction factor (f) were found at t/D = 0.2 and t/D = 1. The numerical study unveiled that the use of metal chains inside the tube leads to path changes and splits in the fluid flow. It is crucial to generate large longitudinal and transverse vortices inside the tube. These vortices play a substantial role in enhancing heat transfer. 2021-04 Thesis http://eprints.uthm.edu.my/4129/ http://eprints.uthm.edu.my/4129/1/24p%20ALI%20HUSSEIN%20GHITHEETH.pdf text en public http://eprints.uthm.edu.my/4129/2/ALI%20HUSSEIN%20GHITHEETH%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/4129/3/ALI%20HUSSEIN%20GHITHEETH%20WATERMARK.pdf text en validuser phd doctoral Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Mekanikal dan Pembuatan
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	T Technology (General) TJ255-265 Heat engines
spellingShingle	T Technology (General) TJ255-265 Heat engines Ghitheeth, Ali Hussein Thermal performance enhancement of a heat exchanger using metal chain as a novel turbulator
description	Enhancing heat transfer in a heat exchanger system is critical to many industrial applications. There are many problems that require in-depth studies to find solutions. One of the main problems is the poor heat transfer rate, due to the fluid flow behavior inside the tubes, and to increase the heat transfer rate, the flow behavior inside the heat exchanger tubes must be changed. This study presents an experimental and numerical approach to enhance heat transfer in a heat exchanger tube using new types of turbulator (metal chains) inserted in the heat exchanger tube to change the flow behavior. Fifteen (15) configurations of metal chains were tested; three ratios of the wire diameter/tube diameter, (t/D = 0.1, 0.15 and 0.2), with five lengths of the chainrings represented by the ring length/tube diameter, (P/D = 1, 2, 3, 4 and 5). The experimental system (test rig) consisted of a 2000 mm thermal insulated carbon steel tube exchanger test section, in which the inner and outer diameters were 20 mm and 26 mm respectively. The fluid used was heavy fuel oil, with a fully developed turbulent flow, Reynolds number, (Re = 5000 to 15000), and uniform heat flux on the external wall of 6000-Watt. A 3D computational fluid dynamics calculation was also made to study the effect of metal chains on the fluid flow behavior inside the tubes on the overall thermal performance. Both experimental and simulation results showed that the insertion of the metal chain into the heat exchanger tube increases the thermal performance factor (η), the Nusselt number (Nu), and the friction factor (f). The thermal performance factor (η) decreased with the increase in Reynolds number for all cases. The highest thermal performance factor (η) was found at t/D = 0.15 and P/D = 3, while both the highest Nusselt number (Nu) and friction factor (f) were found at t/D = 0.2 and t/D = 1. The numerical study unveiled that the use of metal chains inside the tube leads to path changes and splits in the fluid flow. It is crucial to generate large longitudinal and transverse vortices inside the tube. These vortices play a substantial role in enhancing heat transfer.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ghitheeth, Ali Hussein
author_facet	Ghitheeth, Ali Hussein
author_sort	Ghitheeth, Ali Hussein
title	Thermal performance enhancement of a heat exchanger using metal chain as a novel turbulator
title_short	Thermal performance enhancement of a heat exchanger using metal chain as a novel turbulator
title_full	Thermal performance enhancement of a heat exchanger using metal chain as a novel turbulator
title_fullStr	Thermal performance enhancement of a heat exchanger using metal chain as a novel turbulator
title_full_unstemmed	Thermal performance enhancement of a heat exchanger using metal chain as a novel turbulator
title_sort	thermal performance enhancement of a heat exchanger using metal chain as a novel turbulator
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Mekanikal dan Pembuatan
publishDate	2021
url	http://eprints.uthm.edu.my/4129/1/24p%20ALI%20HUSSEIN%20GHITHEETH.pdf http://eprints.uthm.edu.my/4129/2/ALI%20HUSSEIN%20GHITHEETH%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/4129/3/ALI%20HUSSEIN%20GHITHEETH%20WATERMARK.pdf
_version_	1747831051428823040

Thermal performance enhancement of a heat exchanger using metal chain as a novel turbulator

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