An experimental, computational and flow visualization study on the air-side thermal and hydraulic performance of louvered fin and round tube heat exchangers

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dc.contributor.authorOkbaz, Abdulkerim
dc.contributor.authorPinarbasi, Ali
dc.contributor.authorOlcay, Ali Bahadir
dc.contributor.authorAksoy, Muharrem Hilmi
dc.date.accessioned2020-03-26T19:52:51Z
dc.date.available2020-03-26T19:52:51Z
dc.date.issued2018
dc.departmentSelçuk Üniversitesien_US
dc.description.abstractThe aim of this study is to determine heat transfer and pressure drop characteristics in different louvered fin geometries for manufacturing of commercial louvered fin and round tube heat exchangers. Numerical simulations were carried out for various louver angles, louver lengths (pitches), fin pitches and frontal air velocities. The heat transfer and pressure drop characteristics of the louvered fin and round tube heat exchangers, Colburn and friction factors, were respectively normalized with Colburn and friction factors of the flat plate fin and round tube heat exchangers operating under the same conditions and they were presented as the relative Colburn factor j* and the relative friction factor f*. Thermal & hydraulic performance was presented as JF*. Temperature and local Nusselt number contours, and streamline patterns were provided to reveal the mechanisms behind the heat transfer enhancement. Among different heat exchangers for which heat transfer and pressure drop characteristics were obtained, one was chosen to manufacture a real size heat exchanger. Flow visualization studies were also conducted with a PIV system in an open water channel to determine whether the flow structure is louvered directed or not. The louvered fin heat exchanger tested in the PIV system was a five times scaled up model of the real size louvered fin heat exchanger and made from a transparent plexiglas material. PIV results were presented and evaluated based on streamlines and velocity vectors. Furthermore, a numerical analysis was performed using exactly the same dimensions and conditions of the model tested in the PIV system. The comparison between numerical and experimental results was done to validate the numerical model. Consequently, the performance of the fabricated real size heat exchanger was tested at different air velocities in a wind tunnel in a conditioned room. The experimental results were compared with numerical analyses and found to be compatible with each other. Finally, thermal and hydraulic performance of the louvered fin and round tube heat exchanger was compared with a wavy fin and round tube heat exchanger with identical size and specifications. It was found that the thermal and hydraulic performance of the louvered fin and round tube heat exchanger is higher than that of the wavy fin and round tube heat exchanger. The Colburn factor j, friction factor f and JF of the louvered fin and round tube heat exchanger are higher about 16.8-7%, 19.9-8.2% and 10-4.3% than that of the wavy fin and round tube heat exchanger depending on the Reynolds number, respectively. (C) 2017 Elsevier Ltd. All rights reserved.en_US
dc.description.sponsorshipIndustrial Thesis Project [0649.STZ.2014]; Republic of Turkey Ministry of Science, Industry and TechnologyMinistry of Science, Industry & Technology - Turkey; FRITERM Companyen_US
dc.description.sponsorshipThis research has been performed under the Industrial Thesis Project with contract number of 0649.STZ.2014. The authors would like to acknowledge the funding of Republic of Turkey Ministry of Science, Industry and Technology and FRITERM Company. Also, thanks to R&D Engineers Dr. Huseyin Onbasioglu, Mete Ozsen and Mehmet Harun Sokucu who have cooperated in the manufacturing and testing of the heat exchangers.en_US
dc.identifier.doi10.1016/j.ijheatmasstransfer.2017.12.127en_US
dc.identifier.endpage169en_US
dc.identifier.issn0017-9310en_US
dc.identifier.issn1879-2189en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage153en_US
dc.identifier.urihttps://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.12.127
dc.identifier.urihttps://hdl.handle.net/20.500.12395/36319
dc.identifier.volume121en_US
dc.identifier.wosWOS:000430030300016en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherPERGAMON-ELSEVIER SCIENCE LTDen_US
dc.relation.ispartofINTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFERen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectCFDen_US
dc.subjectColburn factor jen_US
dc.subjectCompact heat exchangeren_US
dc.subjectFanning friction factor fen_US
dc.subjectFlow visualizationen_US
dc.subjectHeat exchangeren_US
dc.subjectHeat transferen_US
dc.subjectHeat transfer enhancementen_US
dc.subjectLouvered finen_US
dc.subjectPIVen_US
dc.subjectPressure dropen_US
dc.subjectWavy finen_US
dc.titleAn experimental, computational and flow visualization study on the air-side thermal and hydraulic performance of louvered fin and round tube heat exchangersen_US
dc.typeArticleen_US

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