Experimental assessment of local void fraction and flow development in a U-bend piping system for air-water two-phase flow

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dc.authoridKükrer, Ergin/0000-0002-2933-1474
dc.authorwosidKükrer, Ergin/M-1704-2019
dc.contributor.authorKukrer, Ergin
dc.contributor.authorEskin, Nurdil
dc.date.accessioned2024-07-18T20:42:44Z
dc.date.available2024-07-18T20:42:44Z
dc.date.issued2023
dc.departmentİstanbul Bilgi Üniversitesien_US
dc.description.abstractThis paper presents an experimental investigation of air-water flow in a complete piping system, covering the two-phase flow development in injector, upstream, U-bend and downstream sections separately. Local void fractions and bubble numbers were measured with a dual optical probe. Two-phase flow conditions were established through a 40 mm diameter pipe with 180 l/min water and 30, 35 and 40 l/min air flow rates by the designed circular injector. In the horizontal upstream section, where a transition from bubbly to plug flow with elongated Taylor bubbles was observed, the fully-developed flow is reached at 37.5D. The average void fraction in the upstream region was acquired as 9.2%, 11.5% and 13.4%. The effect of two vertical 90-degree and one vertical 180-degree elbows is assessed in the U-bend section. While bubble break-up and locally annular flow were observed in the vertical upward section; bubble coalescence and accumulation resulting in higher average void fractions (30.8%, 33.8%, and 35.6%) were present in the downward section due to body forces and interphase interactions. After the bend section, disturbances were detected in the gas phase due to the increased water velocity and centripetal forces. Accordingly, a local transition to temporary churn flow is observed in the earlier downstream sections. The experimental assessment in our study shows that the system should be considered and analyzed as a whole to determine local transitions and differences in the flow regimes due to singularities in geometry.en_US
dc.description.sponsorshipResearch Fund of the Istanbul Technical University [42451]en_US
dc.description.sponsorshipThis paper is produced based on the Ph.D. dissertation and supported by the Research Fund of the Istanbul Technical University under project number: 42451.en_US
dc.identifier.doi10.1016/j.ijmultiphaseflow.2023.104610
dc.identifier.issn0301-9322
dc.identifier.issn1879-3533
dc.identifier.scopus2-s2.0-85171794543en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1016/j.ijmultiphaseflow.2023.104610
dc.identifier.urihttps://hdl.handle.net/11411/7396
dc.identifier.volume169en_US
dc.identifier.wosWOS:001080115700001en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherPergamon-Elsevier Science Ltden_US
dc.relation.ispartofInternational Journal of Multiphase Flowen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectAir-Water Two-Phase Flowen_US
dc.subjectPipelineen_US
dc.subjectU-Benden_US
dc.subjectDual Optical Probeen_US
dc.subjectLocal Void Fractionen_US
dc.subjectGas-Liquid 2-Phaseen_US
dc.subjectFrictional Pressure-Dropen_US
dc.subjectHeat-Transferen_US
dc.subjectVelocityen_US
dc.subjectPipeen_US
dc.subjectIdentificationen_US
dc.subjectPatternsen_US
dc.subjectBehavioren_US
dc.subjectPhasesen_US
dc.titleExperimental assessment of local void fraction and flow development in a U-bend piping system for air-water two-phase flow
dc.typeArticle

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