Numerical investigation of enhancing mixed convection heat transfer by using semi- cylindrical obstacles in a vertical channel

Basit Öğe Kaydı
dc.authoridCalisir, Tamer/0000-0002-0721-0444
dc.contributor.authorOzdemir, Sedat
dc.contributor.authorKılıç, Mustafa
dc.contributor.authorCalisir, Tamer
dc.contributor.authorBaşkaya, Şenol
dc.date.accessioned2025-01-06T17:36:57Z
dc.date.available2025-01-06T17:36:57Z
dc.date.issued2023
dc.description.abstractPurpose:In this study, it was aimed to numerically investigate the effects of the location, number and geometry of obstacles in a vertical channel on mixed convection heat transfer and flow properties for water as working fluid under different Re and Gr numbers.Theory and Methods:The FloEFD CFD code has been employed in this study to investigate the effects of semi-cylindrical and rectangular obstacle's location, number and geometry in a vertical channel of height of H=1.8 m and width of W=0.05 m on the mixed convection heat transfer and fluid flow (Figure.A). The effect of two semi -cylindrical obstacles located one under the other, four semi-cylindrical obstacles located one under the other on opposite sides, four rectangular obstacles located one under the other on opposite sides, on heat transfer and flow properties were investigated numerically. Analysis have been made for different Re numbers, Ri numbers, blockage ratios (BR) and L/D values where water was used as working fluid. The fluid enters the channel with a constant temperature (To) and velocity (uo) from the top of the channel.Results:In the present study, it was obtained that Nu number increases with increasing distance between obstacle (L/D) and natural convection effects (Ri number). For both obstacle geometries (two semi-cylindrical and rectangular obstacles), increasing L/D ratio and Ri number causes similar effect on Nu number and enhances heat transfer. It was determined that Nu numbers obtained for semi-cylindrical obstacles are bigger than the Nu numbers of rectangular obstacles. The highest Nu number can be obtained for L/D=1 and Ri=300 for both obstacle geometries.Conclusion:The mixed convection in a vertical channel with obstacles has been investigated numerically. It was observed that Nu number increases with increasing distance between obstacle (L/D) and natural convection effects (Ri number). It can be concluded that, the study could be further continued, and the effects of new types of fluids on heat transfer and flow properties, different channel and obstacle geometries on heat transfer and flow properties could be examined.
dc.identifier.doi10.17341/gazimmfd.1008154
dc.identifier.endpage1820
dc.identifier.issn1300-1884
dc.identifier.issn1304-4915
dc.identifier.issue3
dc.identifier.scopus2-s2.0-85146845827
dc.identifier.scopusqualityQ2
dc.identifier.startpage1805
dc.identifier.trdizinid1159598
dc.identifier.urihttps://doi.org/10.17341/gazimmfd.1008154
dc.identifier.urihttps://search.trdizin.gov.tr/tr/yayin/detay/1159598
dc.identifier.urihttps://hdl.handle.net/20.500.14669/2047
dc.identifier.volume38
dc.identifier.wosWOS:000968663800040
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakTR-Dizin
dc.language.isoen
dc.publisherGazi Univ, Fac Engineering Architecture
dc.relation.ispartofJournal of The Faculty of Engineering and Architecture of Gazi University
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_20241211
dc.subjectChannel flow
dc.subjectMixed convection
dc.subjectObstacle geometry
dc.subjectComputational Fluid Dynamics (CFD)
dc.titleNumerical investigation of enhancing mixed convection heat transfer by using semi- cylindrical obstacles in a vertical channel
dc.title.alternativeKarışık taşınım ile olan ısı transferinin farklı geometrideki akış engelleri kullanılarak iyileştirilmesinin sayısal olarak incelenmesi
dc.typeArticle

Dosyalar

Koleksiyon

WoS İndeksli Yayınlar Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu
TR-Dizin İndeksli Yayınlar Koleksiyonu