Akademik Veri Yönetim Sistemi
Heat Transfer Research, cilt.54, sa.15, ss.29-56, 2023 (SCI-Expanded)
In the present work, three-dimensional numerical study was carried out to perform the single- and multi-objective optimization process of delta winglet pair (DWs) mounted on a rectangular duct with a hydraulic diameter of Dh = 0.0535 m. For the purpose of presenting the consistency of numerical model with experimental data, experimental work was also performed for DWs with an angle of attack of θ = 40° ranging from Re = 5000–20,000. The response surface method (RSM) with central composite design (CCD) was performed to construct numerical design parameters as well as to obtain responses for Nu, f, and thermal enhancement factor (TEF). On this basis, the DWs’ angle of attack (θ), the ratio of the transverse distance between the trailing edges of DWs to the duct width (LVG/W), and the Reynolds number (Re) were considered to be design parameters. The selected single-objectives are maximizing Nu, minimizing f, and maximizing TEF. Moreover, the chosen multi-objectives are maximizing Nu while minimizing f; maximizing Nu and TEF while minimizing f. The findings indicate that the angle of attack (θ) and Re have the greatest influence on all responses compared to the LVG/W ratio. For single-objectives, increase in Nu, decrease in f, and increase in TEF were attained on the order of 45.67%, 14.89%, and 3.98%, respectively, in comparison to the reference case. Furthermore, maximizing Nu while minimizing f was selected as a multi-objective, increase in Nu and decrease in f were calculated to be 36.38% and 12.76%, respectively, compared with the reference case.