Numerical investigation of enhancing mixed convection heat transfer by using semi- cylindrical obstacles in a vertical channel
dc.authorid | Calisir, Tamer/0000-0002-0721-0444 | |
dc.contributor.author | Ozdemir, Sedat | |
dc.contributor.author | Kılıç, Mustafa | |
dc.contributor.author | Calisir, Tamer | |
dc.contributor.author | Başkaya, Şenol | |
dc.date.accessioned | 2025-01-06T17:36:57Z | |
dc.date.available | 2025-01-06T17:36:57Z | |
dc.date.issued | 2023 | |
dc.description.abstract | Purpose: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.doi | 10.17341/gazimmfd.1008154 | |
dc.identifier.endpage | 1820 | |
dc.identifier.issn | 1300-1884 | |
dc.identifier.issn | 1304-4915 | |
dc.identifier.issue | 3 | |
dc.identifier.scopus | 2-s2.0-85146845827 | |
dc.identifier.scopusquality | Q2 | |
dc.identifier.startpage | 1805 | |
dc.identifier.trdizinid | 1159598 | |
dc.identifier.uri | https://doi.org/10.17341/gazimmfd.1008154 | |
dc.identifier.uri | https://search.trdizin.gov.tr/tr/yayin/detay/1159598 | |
dc.identifier.uri | https://hdl.handle.net/20.500.14669/2047 | |
dc.identifier.volume | 38 | |
dc.identifier.wos | WOS:000968663800040 | |
dc.identifier.wosquality | Q3 | |
dc.indekslendigikaynak | Web of Science | |
dc.indekslendigikaynak | Scopus | |
dc.indekslendigikaynak | TR-Dizin | |
dc.language.iso | en | |
dc.publisher | Gazi Univ, Fac Engineering Architecture | |
dc.relation.ispartof | Journal of The Faculty of Engineering and Architecture of Gazi University | |
dc.relation.publicationcategory | Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı | |
dc.rights | info:eu-repo/semantics/openAccess | |
dc.snmz | KA_20241211 | |
dc.subject | Channel flow | |
dc.subject | Mixed convection | |
dc.subject | Obstacle geometry | |
dc.subject | Computational Fluid Dynamics (CFD) | |
dc.title | Numerical investigation of enhancing mixed convection heat transfer by using semi- cylindrical obstacles in a vertical channel | |
dc.title.alternative | Karışık taşınım ile olan ısı transferinin farklı geometrideki akış engelleri kullanılarak iyileştirilmesinin sayısal olarak incelenmesi | |
dc.type | Article |