Augmentation of ribs turbulators height on the hydrothermal performance of double pipe heat exchanger

Thermal performance of double pipe heat exchanger can be enhanced by imposed turbulence in the annular flow using artificial roughening. This paper presents experimental results on enhancing the heat transfer by artificial roughening using energy promoters installed on the inner surface of the cold...

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Main Authors: Al-Kayiem, H.H., Ekhwan, A.B., Muhi, L.N.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.19644 /
Published: Taylor's University 2017
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85011990671&partnerID=40&md5=9696d6d1d446191841741d2635431648
http://eprints.utp.edu.my/19644/
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spelling utp-eprints.196442018-04-20T07:23:51Z Augmentation of ribs turbulators height on the hydrothermal performance of double pipe heat exchanger Al-Kayiem, H.H. Ekhwan, A.B. Muhi, L.N. Thermal performance of double pipe heat exchanger can be enhanced by imposed turbulence in the annular flow using artificial roughening. This paper presents experimental results on enhancing the heat transfer by artificial roughening using energy promoters installed on the inner surface of the cold flow annulus. An experimental test rig was fabricated having 2.0 m long annular flow test section with 76.2 mm and 34.2 mm outside and inside diameters, respectively. The energy promoters have ribs shape with rectangular cross section. Two cases of rib’s pitch to height ratios, equal to 10 and 15 and three height to hydraulic diameter, equal to 0.0595, 0.0-3, and 0.107 have been studied. The investigations were carried out at various flow rates within Reynolds number range of 2900 to 21000 in the cold annulus. For each roughening case, the thermal and hydraulic performances were evaluated by determining Stanton number and the associated pressure drop, respectively. The experimental results showed that enhancement in the heat transfer was combined with a penalty in the pressure drop due to the increase in the friction factor values. The combined hydrothermal enhancement results of the DPHE, in terms of the performance index, indicate that the small height ribs to hydraulic diameter of 0.0595, augmented higher than the large height ribs to hydraulic diameter of 0.107. Hence, it is recommended to use ribs installed on the inner surface of the annulus ribs to hydraulic diameter in the range of 0.06 ± 0.005. Also, it is recommended to investigate further parameters to explore further on the influencing of the ribs on the hydrothermal performance of the DPHE. © School of Engineering, Taylor’s University. Taylor's University 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85011990671&partnerID=40&md5=9696d6d1d446191841741d2635431648 Al-Kayiem, H.H. and Ekhwan, A.B. and Muhi, L.N. (2017) Augmentation of ribs turbulators height on the hydrothermal performance of double pipe heat exchanger. Journal of Engineering Science and Technology, 12 (2). pp. 548-563. http://eprints.utp.edu.my/19644/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description Thermal performance of double pipe heat exchanger can be enhanced by imposed turbulence in the annular flow using artificial roughening. This paper presents experimental results on enhancing the heat transfer by artificial roughening using energy promoters installed on the inner surface of the cold flow annulus. An experimental test rig was fabricated having 2.0 m long annular flow test section with 76.2 mm and 34.2 mm outside and inside diameters, respectively. The energy promoters have ribs shape with rectangular cross section. Two cases of rib’s pitch to height ratios, equal to 10 and 15 and three height to hydraulic diameter, equal to 0.0595, 0.0-3, and 0.107 have been studied. The investigations were carried out at various flow rates within Reynolds number range of 2900 to 21000 in the cold annulus. For each roughening case, the thermal and hydraulic performances were evaluated by determining Stanton number and the associated pressure drop, respectively. The experimental results showed that enhancement in the heat transfer was combined with a penalty in the pressure drop due to the increase in the friction factor values. The combined hydrothermal enhancement results of the DPHE, in terms of the performance index, indicate that the small height ribs to hydraulic diameter of 0.0595, augmented higher than the large height ribs to hydraulic diameter of 0.107. Hence, it is recommended to use ribs installed on the inner surface of the annulus ribs to hydraulic diameter in the range of 0.06 ± 0.005. Also, it is recommended to investigate further parameters to explore further on the influencing of the ribs on the hydrothermal performance of the DPHE. © School of Engineering, Taylor’s University.
format Article
author Al-Kayiem, H.H.
Ekhwan, A.B.
Muhi, L.N.
spellingShingle Al-Kayiem, H.H.
Ekhwan, A.B.
Muhi, L.N.
Augmentation of ribs turbulators height on the hydrothermal performance of double pipe heat exchanger
author_sort Al-Kayiem, H.H.
title Augmentation of ribs turbulators height on the hydrothermal performance of double pipe heat exchanger
title_short Augmentation of ribs turbulators height on the hydrothermal performance of double pipe heat exchanger
title_full Augmentation of ribs turbulators height on the hydrothermal performance of double pipe heat exchanger
title_fullStr Augmentation of ribs turbulators height on the hydrothermal performance of double pipe heat exchanger
title_full_unstemmed Augmentation of ribs turbulators height on the hydrothermal performance of double pipe heat exchanger
title_sort augmentation of ribs turbulators height on the hydrothermal performance of double pipe heat exchanger
publisher Taylor's University
publishDate 2017
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85011990671&partnerID=40&md5=9696d6d1d446191841741d2635431648
http://eprints.utp.edu.my/19644/
_version_ 1741196239965257728
score 11.62408

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