Performance assessment in a heat exchanger tube fitted with double counter twisted tape inserts

Bhuiya, M.M.K., Sayem, A.S.M., Islam, M., Chowdhury, M.S.U., & Shahabuddin, M. (2014) Performance assessment in a heat exchanger tube fitted with double counter twisted tape inserts. International Communications in Heat and Mass Transfer, 50, pp. 25-33.

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Abstract

The present study explored the effects of the double counter twisted tapes on heat transfer and fluid friction characteristics in a heat exchanger tube. The double counter twisted tapes were used as counter-swirl flow generators in the test section. The experiments were performed with double counter twisted tapes of four different twist ratios (y = 1.95, 3.85, 5.92 and 7.75) using air as the testing fluid in a circular tube turbulent flow regime where the Reynolds number was varied from 6950 to 50,050. The experimental results demonstrated that the Nusselt number, friction factor and thermal enhancement efficiency were increased with decreasing twist ratio. The results also revealed that the heat transfer rate in the tube fitted with double counter twisted tape was significantly increased with corresponding increase in pressure drop. In the range of the present work, heat transfer rate and friction factor were obtained to be around 60 to 240% and 91 to 286% higher than those of the plain tube values, respectively. The maximum thermal enhancement efficiency of 1.34 was achieved by the use of double counter twisted tapes at constant blower power. In addition, the empirical correlations for the Nusselt number, friction factor and thermal enhancement efficiency were also developed, based on the experimental data.

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24 citations in Scopus
21 citations in Web of Science®
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ID Code: 88881
Item Type: Journal Article
Refereed: Yes
DOI: 10.1016/j.icheatmasstransfer.2013.11.005
ISSN: 0735-1933
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 08 Oct 2015 04:32
Last Modified: 08 Oct 2015 04:32

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