Numerical comparison of thermal and hydraulic performances for heat exchangers having circular and elliptic cross-section

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dc.contributor.authorDogan, Sercan
dc.contributor.authorDarici, Selcuk
dc.contributor.authorOzgoren, Muammer
dc.date.accessioned2024-02-23T14:03:10Z
dc.date.available2024-02-23T14:03:10Z
dc.date.issued2019
dc.departmentNEÜen_US
dc.description.abstractThe plain fin and circular tubes are generally used in heat exchangers of cooling systems. Numerous studies aiming at enhancing the thermal and hydraulic performances of this type of heat exchangers by changing the fin geometries are present in literature. In the present study, thermal and hydraulic performances of the heat exchangers with circular and elliptical tube have been compared using computational fluid dynamic method. Initially, the validation and comparison were done for the obtained data of the finned and circular tube design with respect to the performance results of the finned and circular tube design in the literature. The ellipticity ratios for the staggered arrangements of heat exchangers were changed within the range of b/a = 0.307-1.0. Numerical studies were performed with ANSYS-Fluent software within the range of Re = 750-2850 based on the fin spacing. As a result of the numerical validation studies, all analyses were solved by utilizing the SST k-omega turbulence model yielding closer values to the available studies similar to literature. Colburn factor j, friction factor f, JF values being the efficiency index and normalized j*, f* and JF* values were calculated and presented graphically. Moreover, temperature contours and streamline patterns were visually presented to evaluate the flow structures around the six different arrangements and to explain the physical reasons of pressure drop and heat transfer phenomena. The largest values of the Colburn factor j and the friction factor f known respectively as an indicator of heat transfer and a measure of pressure drop were obtained for the circular-tube-design ratio of b/a = 1.0 when compared to the other arrangements. According to the JF values, which is the efficiency index and the integrated outcome of heat transfer and pressure drop, the best result was obtained for the model with the diameter ratio of b/a = 0.307. Variations of the JF values for the arrangements of b/a = 0.333 and b/a = 0.307 depending on Reynolds numbers were found to be significantly close to each other. Finally, it is demonstrated that elliptical cross-section tubes with a better design in terms of lower pressure drop and less separated flow structures can be preferred in heat exchanger applications in order to provide energy saving. (C) 2019 Elsevier Ltd. All rights reserved.en_US
dc.description.sponsorshipRepublic of Turkey Ministry of Industry and Technology under the SANTEZ programen_US
dc.description.sponsorshipThe authors thank to Republic of Turkey Ministry of Industry and Technology for the partial financial support under the SANTEZ program during the period of 2013-2016 years.en_US
dc.identifier.doi10.1016/j.ijheatmasstransfer.2019.118731
dc.identifier.issn0017-9310
dc.identifier.issn1879-2189
dc.identifier.scopus2-s2.0-85072554024en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1016/j.ijheatmasstransfer.2019.118731
dc.identifier.urihttps://hdl.handle.net/20.500.12452/12001
dc.identifier.volume145en_US
dc.identifier.wosWOS:000494883600029en_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.subjectCfden_US
dc.subjectCooling Systemen_US
dc.subjectElliptical Tubesen_US
dc.subjectHeat Transferen_US
dc.subjectThermal-Hydraulic Performanceen_US
dc.titleNumerical comparison of thermal and hydraulic performances for heat exchangers having circular and elliptic cross-sectionen_US
dc.typeArticleen_US

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