2026-10-18T23:54:18Zhttps://ebyu-rdlopen.rawdatalibrary.net/oai/request

oai:ebyu-rdlopen.rawdatalibrary.net:ebyu/128972026-10-18T20:36:43Zopenairedrivercom_ebyu_10000col_ebyu_10001

Thermal–hydraulic performance of the circular-slice-shaped-winglet for tube bank heat exchangerTepe, Ahmet ÜmitYilmaz, HarunCFDForced convectionTube bank heat exchangerWingletHeat exchangersNavier Stokes equationsTubes (components)Turbulence modelsBare tube heat exchangerConditionHeat transfer performanceLaminar and turbulent flowOptimal designPerformance evaluation criteriaThermal-hydraulic performanceTube banksComputational fluid dynamicsIn this study, heat transfer performance of circular-slice-shaped-winglet (CSSW) for tube bank heat exchanger (TBHE) was numerically investigated. Circular-slice angle (α = 5°, 10° and 20°), layer gap (h/d = 0.08, 0.14, and 0.20) and winglet diameter (D/d = 1.60, 1.76 and 1.92) were analyzed as geometric parameters to obtain optimal design. Comprehensive numerical simulations were conducted under both laminar and turbulent flow (1100 ≤ Re ≤ 8500) conditions. Navier Stokes Equations were solved by using RNG k-ε turbulence model (with enhanced wall treatment). Colburn-j factor (j), friction factor (f), modified London area goodness factor (j/f1/3) and performance evaluation criterion (PEC) were investigated quantitatively. Flow characteristics were also analyzed to elucidate the underlying physics of the effects of CSSW on thermal-hydraulic performance for TBHE. Results were compared with the data related to bare tube heat exchanger, and showed that the highest modified London area goodness factor is 26.34% with α = 10°, h/d = 0.20 and D/d = 1.92 CSSW winglet design. Additionally, numerical calculations revealed that PEC increased to 1.356 with these CSSW design parameters, which corresponds to reduction of the required total heat transfer area by 36.60% compared to the bare tube heat exchanger for the same heat duty at a fixed pumping power. © 2022 Elsevier Masson SASElsevier Masson s.r.l.2022Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/12897https://doi.org/10.1016/j.ijthermalsci.2022.1077111290-0729enInternational Journal of Thermal Sciencesinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/12897