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Two-phase flow regime identification through local temperature mapping

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Show simple item record O'Donovan, Alan Grimes, Ronan 2020-03-27T15:30:34Z 2020
dc.description peer-reviewed en_US
dc.description The full text of this article will not be available in ULIR until the embargo expires on the 08/02/2022
dc.description.abstract Two-phase flows underpin some of our most ubiquitous technologies, ranging from micro-scale liquid-liquid cooling of electronics to macro-scale liquid-vapour boiling and condensation in thermal power plants. Establishing the morphology of a two-phase flow, under a prescribed set of conditions, is considered particularly important in the design stage. As the pressure loss and heat transfer characteristics of a two-phase flow are intimately linked to the fluidic arrangement, knowledge of the prevailing flow topology enhances understanding, and can lead to the development of flow-specific correlations and/or models. This paper presents a novel experimental measurement technique for identifying the predominant two-phase flow regime in a circular tube. Specifically, the investigation presented in this paper focuses on condensing flows of steam, at typical Rankine cycle cooling conditions. However, it is proposed that the experimental arrangement and methodology can be applied to any two-phase flow scenario. The approach presented herein employs a temperature measurement platform - composed from localised instrumentation - to measure the temperature drop, associated with the presence of a liquid phase, at any point in the tube. Through analysis and interpretation of local temperature difference measurements around the inside tube circumference, and along the tube length, the predominant flow regime can be identified. In this study, measurements were taken from a 25 mm internal diameter round tube, with steam flow rates in the range of 0.42–0.94 g·s-1 . The flow regime was seen to transition from an annular-type profile nearest the tube inlet to a stratified-wavy topology towards the tube exit in all instances. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Experimental Thermal and Fluid Science;115, 110077
dc.rights This is the author’s version of a work that was accepted for publication in Experimental Thermal and Fluid Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in, Experimental Thermal and Fluid Science, en_US
dc.subject two-phase flow en_US
dc.subject flow regime en_US
dc.subject flow mapping en_US
dc.title Two-phase flow regime identification through local temperature mapping en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1016/j.expthermflusci.2020.110077 2022-02-08
dc.embargo.terms 2022-02-08 en_US
dc.rights.accessrights info:eu-repo/semantics/embargoedAccess en_US

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