Air bubble injection technique for enhancing heat transfer in a coiled tube heat exchanger: An experimental study

Saif Salah Hasan; Hameed B. Mahood; Ali Shakir Baqir

doi:10.1063/5.0066887

Air bubble injection technique for enhancing heat transfer in a coiled tube heat exchanger: An experimental study

Saif Salah Hasan, Hameed B. Mahood^*, Ali Shakir Baqir

^*Corresponding author for this work

Chemical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Similar to our previous study, the effect of bubble size used in air bubble injection on enhancing heat transfer in a vertically coiled tube heat exchanger was determined experimentally in the present work. Three bubble sizes (0.1, 0.8, and 1.5 mm) were tested under four shell-side flow rates (2, 4, 6, and 8 L min), constant hot fluid flow rate (1 L min), and constant temperature difference (20 °C). The temperature distribution along the height of the heat exchanger was measured with the heat transfer rate. Results indicated that air bubbles' injection generally led to a significant augmentation of the heat transfer rate in the heat exchanger. This phenomenon was clearly demonstrated by the rise in temperature distribution over the heat exchanger, and accordingly, by the calculated heat transfer rate. Moreover, the results showed that an increase in bubble size further improved the heat transfer rate. However, an optimum bubble size at which the heat exchanger can work with maximum effectiveness exists. The optimum bubble size for the present study was 0.8 mm. Further studies are recommended to gather more evidence for this phenomenon.

Original language	English
Title of host publication	3rd International Scientific Conference of Alkafeel University (ISCKU 2021)
Editors	N. Aldahan, Ali J. Ramadhan
Publisher	AIP Publishing
Number of pages	8
ISBN (Electronic)	9780735441507
DOIs	https://doi.org/10.1063/5.0066887
Publication status	Published - 11 Jan 2022
Event	3rd International Scientific Conference of Alkafeel University, ISCKU 2021 - Najaf, Iraq Duration: 22 Mar 2021 → 23 Mar 2021

Publication series

Name	AIP Conference Proceedings
Number	1
Volume	2386
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	3rd International Scientific Conference of Alkafeel University, ISCKU 2021
Country/Territory	Iraq
City	Najaf
Period	22/03/21 → 23/03/21

Bibliographical note

Publisher Copyright:
© 2022 Author(s).

Keywords

vertical heat exchanger
sparger
helical coil
injection bubbles
temperature distribution

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1063/5.0066887

Cite this

Hasan, S. S., Mahood, H. B., & Baqir, A. S. (2022). Air bubble injection technique for enhancing heat transfer in a coiled tube heat exchanger: An experimental study. In N. Aldahan, & A. J. Ramadhan (Eds.), 3rd International Scientific Conference of Alkafeel University (ISCKU 2021) Article 040019 (AIP Conference Proceedings; Vol. 2386, No. 1). AIP Publishing. https://doi.org/10.1063/5.0066887

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title = "Air bubble injection technique for enhancing heat transfer in a coiled tube heat exchanger: An experimental study",

abstract = "Similar to our previous study, the effect of bubble size used in air bubble injection on enhancing heat transfer in a vertically coiled tube heat exchanger was determined experimentally in the present work. Three bubble sizes (0.1, 0.8, and 1.5 mm) were tested under four shell-side flow rates (2, 4, 6, and 8 L min), constant hot fluid flow rate (1 L min), and constant temperature difference (20 °C). The temperature distribution along the height of the heat exchanger was measured with the heat transfer rate. Results indicated that air bubbles' injection generally led to a significant augmentation of the heat transfer rate in the heat exchanger. This phenomenon was clearly demonstrated by the rise in temperature distribution over the heat exchanger, and accordingly, by the calculated heat transfer rate. Moreover, the results showed that an increase in bubble size further improved the heat transfer rate. However, an optimum bubble size at which the heat exchanger can work with maximum effectiveness exists. The optimum bubble size for the present study was 0.8 mm. Further studies are recommended to gather more evidence for this phenomenon.",

keywords = "vertical heat exchanger, sparger, helical coil, injection bubbles, temperature distribution",

author = "Hasan, {Saif Salah} and Mahood, {Hameed B.} and Baqir, {Ali Shakir}",

note = "Publisher Copyright: {\textcopyright} 2022 Author(s).; 3rd International Scientific Conference of Alkafeel University, ISCKU 2021 ; Conference date: 22-03-2021 Through 23-03-2021",

year = "2022",

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Hasan, SS, Mahood, HB & Baqir, AS 2022, Air bubble injection technique for enhancing heat transfer in a coiled tube heat exchanger: An experimental study. in N Aldahan & AJ Ramadhan (eds), 3rd International Scientific Conference of Alkafeel University (ISCKU 2021)., 040019, AIP Conference Proceedings, no. 1, vol. 2386, AIP Publishing, 3rd International Scientific Conference of Alkafeel University, ISCKU 2021, Najaf, Iraq, 22/03/21. https://doi.org/10.1063/5.0066887

Air bubble injection technique for enhancing heat transfer in a coiled tube heat exchanger: An experimental study. / Hasan, Saif Salah; Mahood, Hameed B.; Baqir, Ali Shakir.
3rd International Scientific Conference of Alkafeel University (ISCKU 2021). ed. / N. Aldahan; Ali J. Ramadhan. AIP Publishing, 2022. 040019 (AIP Conference Proceedings; Vol. 2386, No. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Air bubble injection technique for enhancing heat transfer in a coiled tube heat exchanger

T2 - 3rd International Scientific Conference of Alkafeel University, ISCKU 2021

AU - Hasan, Saif Salah

AU - Mahood, Hameed B.

AU - Baqir, Ali Shakir

PY - 2022/1/11

Y1 - 2022/1/11

N2 - Similar to our previous study, the effect of bubble size used in air bubble injection on enhancing heat transfer in a vertically coiled tube heat exchanger was determined experimentally in the present work. Three bubble sizes (0.1, 0.8, and 1.5 mm) were tested under four shell-side flow rates (2, 4, 6, and 8 L min), constant hot fluid flow rate (1 L min), and constant temperature difference (20 °C). The temperature distribution along the height of the heat exchanger was measured with the heat transfer rate. Results indicated that air bubbles' injection generally led to a significant augmentation of the heat transfer rate in the heat exchanger. This phenomenon was clearly demonstrated by the rise in temperature distribution over the heat exchanger, and accordingly, by the calculated heat transfer rate. Moreover, the results showed that an increase in bubble size further improved the heat transfer rate. However, an optimum bubble size at which the heat exchanger can work with maximum effectiveness exists. The optimum bubble size for the present study was 0.8 mm. Further studies are recommended to gather more evidence for this phenomenon.

AB - Similar to our previous study, the effect of bubble size used in air bubble injection on enhancing heat transfer in a vertically coiled tube heat exchanger was determined experimentally in the present work. Three bubble sizes (0.1, 0.8, and 1.5 mm) were tested under four shell-side flow rates (2, 4, 6, and 8 L min), constant hot fluid flow rate (1 L min), and constant temperature difference (20 °C). The temperature distribution along the height of the heat exchanger was measured with the heat transfer rate. Results indicated that air bubbles' injection generally led to a significant augmentation of the heat transfer rate in the heat exchanger. This phenomenon was clearly demonstrated by the rise in temperature distribution over the heat exchanger, and accordingly, by the calculated heat transfer rate. Moreover, the results showed that an increase in bubble size further improved the heat transfer rate. However, an optimum bubble size at which the heat exchanger can work with maximum effectiveness exists. The optimum bubble size for the present study was 0.8 mm. Further studies are recommended to gather more evidence for this phenomenon.

KW - vertical heat exchanger

KW - sparger

KW - helical coil

KW - injection bubbles

KW - temperature distribution

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M3 - Conference contribution

AN - SCOPUS:85123620793

T3 - AIP Conference Proceedings

BT - 3rd International Scientific Conference of Alkafeel University (ISCKU 2021)

A2 - Aldahan, N.

A2 - Ramadhan, Ali J.

PB - AIP Publishing

Y2 - 22 March 2021 through 23 March 2021

ER -

Air bubble injection technique for enhancing heat transfer in a coiled tube heat exchanger: An experimental study

Abstract

Publication series

Conference

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

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Cite this