Flow boiling heat transfer and pressure drop characteristics of Isobutane in horizontal channels with twisted tapes

Sarmadian, A; Moghaddam, HA; Asnaashari, A; Joushani, HAN; Moosavi, M; Islam, MS; Saha, SC; Shafaee, M

Flow boiling heat transfer and pressure drop characteristics of Isobutane in horizontal channels with twisted tapes

Sarmadian, A Moghaddam, HA Asnaashari, A Joushani, HAN Moosavi, M Islam, MS Saha, SC Shafaee, M

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: International Journal of Heat and Mass Transfer, 2020, 162, pp. 120345-120345
Issue Date:: 2020-12-01

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Field	Value	Language
dc.contributor.author	Sarmadian, A
dc.contributor.author	Moghaddam, HA
dc.contributor.author	Asnaashari, A
dc.contributor.author	Joushani, HAN
dc.contributor.author	Moosavi, M
dc.contributor.author	Islam, MS
dc.contributor.author	Saha, SC
dc.contributor.author	Shafaee, M
dc.date.accessioned	2020-09-01T03:30:56Z
dc.date.available	2020-09-01T03:30:56Z
dc.date.issued	2020-12-01
dc.identifier.citation	International Journal of Heat and Mass Transfer, 2020, 162, pp. 120345-120345
dc.identifier.issn	0017-9310
dc.identifier.uri	http://hdl.handle.net/10453/142467
dc.description.abstract	© 2020 Elsevier Ltd Using twisted tapes as a passive method for heat transfer improvement in a two-phase flow heat exchanger is experimentally studied. The test evaporator is a copper channel with a length of 1000 mm and an internal diameter of 8.1 mm which is installed horizontally. Three twisted tapes with twist ratios of 4, 10, and 15 are used at refrigerant vapor qualities in the range of 0.1–0.8 and refrigerant mass velocities between 160-350 kgm−2s−1. The natural refrigerant Isobutane (R600a) is chosen as the working fluid because it is environmentally friendly. According to the experiments, installing twisted tapes inside the channel augments both heat transfer rate and pressure drops over the plain channel. It is also observed that for both plain and twisted tape inserted channels, the values of heat transfer coefficients and pressure losses grow by giving rise to the refrigerant mass velocity and vapor quality. Results showed that the system performance factor varied between 0.44–1.09 offering that using twisted tapes as a turbulator is beneficial under specific operating conditions. The empirical data showed that there is an optimum value of the working fluid mass velocity at which the performance of twisted tape inserted channels is higher.
dc.language	en
dc.publisher	Elsevier BV
dc.relation.ispartof	International Journal of Heat and Mass Transfer
dc.relation.isbasedon	10.1016/j.ijheatmasstransfer.2020.120345
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject	01 Mathematical Sciences, 02 Physical Sciences, 09 Engineering
dc.subject.classification	Mechanical Engineering & Transports
dc.title	Flow boiling heat transfer and pressure drop characteristics of Isobutane in horizontal channels with twisted tapes
dc.type	Journal Article
utslib.citation.volume	162
utslib.for	01 Mathematical Sciences
utslib.for	02 Physical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2022-12-01T00:00:00+1000Z
dc.date.updated	2020-09-01T03:30:51Z
pubs.publication-status	Accepted
pubs.volume	162

Abstract:

© 2020 Elsevier Ltd Using twisted tapes as a passive method for heat transfer improvement in a two-phase flow heat exchanger is experimentally studied. The test evaporator is a copper channel with a length of 1000 mm and an internal diameter of 8.1 mm which is installed horizontally. Three twisted tapes with twist ratios of 4, 10, and 15 are used at refrigerant vapor qualities in the range of 0.1–0.8 and refrigerant mass velocities between 160-350 kgm−2s−1. The natural refrigerant Isobutane (R600a) is chosen as the working fluid because it is environmentally friendly. According to the experiments, installing twisted tapes inside the channel augments both heat transfer rate and pressure drops over the plain channel. It is also observed that for both plain and twisted tape inserted channels, the values of heat transfer coefficients and pressure losses grow by giving rise to the refrigerant mass velocity and vapor quality. Results showed that the system performance factor varied between 0.44–1.09 offering that using twisted tapes as a turbulator is beneficial under specific operating conditions. The empirical data showed that there is an optimum value of the working fluid mass velocity at which the performance of twisted tape inserted channels is higher.

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