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Subatmospheric boiling study of the operation of a horizontal thermosyphon reboiler loop: Instability

Agunlejika, Ezekiel O.; Langston, Paul A.; Azzopardi, Barry J.; Hewakandamby, Buddhika N.

Authors

Ezekiel O. Agunlejika

Paul A. Langston

Barry J. Azzopardi



Abstract

Distillation and chemical processing under vacuum is of immense interest to petroleum and chemical industries due to lower energy costs and improved safety. To tap into these benefits, energy efficient reboilers with lower maintenance costs are required. Here, a horizontal thermosyphon reboiler is investigated at subatmospheric pressures and low heat fluxes. This paper presents detailed experimental data obtained using Wire Mesh Sensor in a gas-liquid flow with heat transfer as well as temperatures, pressures and recirculation rates around the loop. Flow regimes which have been previously identified in other systems were detected. The nature of the instability which underpins the mechanisms involved and conditions aiding instability are reported. Churn flow pattern is persistently detected during instability. The nature of the instability and existence of oscillatory churn flow are interconnected

Citation

Agunlejika, E. O., Langston, P. A., Azzopardi, B. J., & Hewakandamby, B. N. (2016). Subatmospheric boiling study of the operation of a horizontal thermosyphon reboiler loop: Instability. Applied Thermal Engineering, 109(A), 739-745. https://doi.org/10.1016/j.applthermaleng.2016.08.135

Journal Article Type Article
Acceptance Date Aug 21, 2016
Online Publication Date Aug 22, 2016
Publication Date Oct 25, 2016
Deposit Date Sep 22, 2016
Publicly Available Date Sep 22, 2016
Journal Applied Thermal Engineering
Print ISSN 1359-4311
Electronic ISSN 1873-5606
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 109
Issue A
Pages 739-745
DOI https://doi.org/10.1016/j.applthermaleng.2016.08.135
Keywords Horizontal thermosyphon reboiler; Geysering instability; Subatmospheric boiling; Start-up; Wire Mesh Sensor; Two-phase heat transfer
Public URL http://eprints.nottingham.ac.uk/id/eprint/37037
Publisher URL http://www.sciencedirect.com/science/article/pii/S135943111631496X
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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