Sürdürülebilir Kalkınma Amaçları

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Yazarlar

• Manay, Eyuphan(2)
• Amin Bhuiyan, Mohammad Ruhul(1)
• Ates, I.(1)
• Ates, Ibrahim(1)
• Bayrakceken, A.(1)
• Bayrakceken, Abdulkadir(1)
• Bektaş, Enes(1)
• Celik, Cafer(1)
• Comakli, Kemal(1)
• Comakli, Omer(1)
• Gunes, Sibel(1)
• Karakaş, İbrahim Hakkı(1)
• Korucu, Haluk(1)
• Manay, E.(1)
• Ozceyhan, Veysel(1)
• Ozdemir, Nesrin(1)
• Sahin, B.(1)
• Sahin, Bayram(1)
• Senyigit, Ercan(1)
• Ucuncuoglu, Didar(1)
• Yilmaz, Mehmet(1)

• MakaleYalnız künye2025Scopus SJRQ1/r/bayburt/12636
  Eco-friendly reduction of graphene oxide using urea: An optimized approach for high-performance rGO

  Ucuncuoglu, Didar; Bektaş, Enes; Karakaş, İbrahim Hakkı; Amin Bhuiyan, Mohammad Ruhul; Korucu, Haluk

  The growing demand for environmentally friendly and cost-effective approaches has accelerated the development of sustainable methods for the synthesis of reduced graphene oxide (rGO). In this study, urea was utilized as a green reducing agent for rGO synthesis, offering an alternative to conventional toxic chemicals. The synthesized rGO was comprehensively characterized using FTIR, SEM-EDS, Raman spectroscopy, XRD, BET analysis, zeta potential, and conductivity measurements. These analyses revealed key functional, structural, and morphological properties, including surface functional groups, elemental composition, carbon-to-oxygen (C/O) ratio, particle size (PS), crystallite size (CS), specific surface area (SSA), zeta potential (ZP), thermal conductivity (TC), and electrical conductivity (EC). Process optimization was performed using the Taguchi L4(23) orthogonal array design across nine quality parameters. Under optimal conditions, notable enhancements were achieved: C/O ratio increased by 108%, ID/IG ratio by 164%, I2D/IG ratio by 26%, CS by 75%, and SSA by 134%, while PS was reduced by 37%. Furthermore, ZP and TC increased by 58% and 33%, respectively, whereas EC was reduced by 97%. These findings demonstrate the potential of urea as a sustainable and effective reducing agent in the production of high-performance rGO materials.

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  AtıfScopus3·WoS3·OpenAlex3

  İncele
• MakaleYalnız künye2019Scopus SJRQ1/r/bayburt/12556
  Optimization of design parameters for heat transfer and friction factor in a heat sink with hollow trapezoidal baffles

  Sahin, Bayram; Ates, Ibrahim; Manay, Eyuphan; Bayrakceken, Abdulkadir; Celik, Cafer

  The aim of this study is to optimize the design parameters of a heat sink on which hollow trapezoidal baffles are mounted on the bottom surface by using Taguchi experimental-design method. The Nusselt number and the friction factor are considered as performance parameters. An orthogonal array is selected as experimental plan for the six parameters: the corner angle (α), the inclination angle (β), the baffle height (H), the baffle length (L), the baffle width (S) and Reynolds number. First of all, each goal has been optimized, separately. Then, all the goals have been optimized together, considering the priority of the goals. The length of the baffle is found to be the most influential parameter on the friction factor. This can be attributed the enhanced effect of longitudinal vortices with baffle length in flow direction. Likewise, it is demonstrated that the most effective parameter on the heat transfer is Reynolds number. The results show that the baffle width (S) and the corner angle (α) have insignificant effect on Nusselt number. The maximum heat transfer was obtained at Re = 17,000, H = 36 mm, L = 45 mm, S = 26 mm, α = 0°, β = 0°. The inclination angle (β) and the baffle height (H) have nearly no effect on the friction factor. The minimum friction factor was obtained at Re = 17,000, H = 20 mm, L = 25 mm, S = 26 mm, α = 16°, β = 0°. The inclination angle (β) and the baffle height (H) have nearly no effect on the friction factor. It can be concluded that the higher heat transfer rates can be achieved with lower pressure drop penalty with this type of vortex generator in particular configurations.

  AtıfScopus31·WoS27·OpenAlex32

  İncele
• BildiriYalnız künye2017/r/bayburt/12513
  Analysis of turbulent convective heat transfer from rectangular baffles by Taguchi method

  Sahin, B.; Bayrakceken, A.; Manay, E.; Ates, I.

  In this study, the effects of the rectangular baffles mounted on the bottom surface of a heat exchanger on the heat and pressure drop characteristics were investigated using the Taguchi experimental-design method. Nusselt number and friction factor were considered as performance parameters. An L18(2135) orthogonal array was selected as an experimental plan for the six parameters: corner angle (α), inclination angle (β), baffle height (H), baffle length (L), baffle width (S) and Reynolds number. First of all, each goal was optimized, separately. Then, all the goals were optimized together, considering the priority of the goals. The presence of the rectangular cross sectioned baffles caused higher pressure drop than that of the smooth channel. It was concluded that increasing inclination angle and corner angle caused heat transfer to decrease. The length of the baffle was found to be the most influential parameter on friction factor. Likewise, it was concluded that the most affected parameter on the heat transfer was Reynolds number.

  İncele
• MakaleYalnız künye2011Scopus SJRQ1/r/bayburt/13988
  A Taguchi approach for optimization of design parameters in a tube with coiled wire inserts

  Gunes, Sibel; Manay, Eyuphan; Senyigit, Ercan; Ozceyhan, Veysel

  This study presents the determination of the optimum values of the design parameters in a tube with equilateral triangular cross-sectioned coiled wire inserts. The effects of the design parameters such as the ratio of the distance between the coiled wire and test tube wall to tube diameter (s/D), pitch ratio (P/D), ratio of the side length of equilateral triangle to tube diameter (a/D) and Reynolds number (Re) on heat transfer and pressure drop were investigated by using Taguchi method. The Nusselt number and friction factor were considered as performance parameters. An L9(34) orthogonal array was chosen as experimental plan. The goal of this study is to reach maximum heat transfer (i.e. Nusselt number) and minimum pressure drop (i.e. friction factor). First of all, each goal was optimized, separately. Then, all the goals were optimized together, considering the priority of the goals. Contribution ratios for each parameter on the heat transfer and pressure drop were determined. Consequently, the optimum results were found to be s/D = 0.0357, P/D = 1, a/D = 0.0714 and Re = 19800.

  AtıfScopus115·WoS100·OpenAlex113

  İncele
• MakaleYalnız künye2010Scopus SJRQ3/r/bayburt/14520
  ANALYSIS OF HEAT PUMPS WITH ZEOTROPIC REFRIGERANT MIXTURES BY TAGUCHI METHOD

  Comakli, Omer; Comakli, Kemal; Ozdemir, Nesrin; Yilmaz, Mehmet

  The goal of this work is to determine the optimum set of parameters by using the Taguchi method in vapour compression heat pump systems. The experimental apparatus consist of an air-to-liquid vapor compression heat pump, a water cooled condenser, a forced air evaporator, an electrical air and water heaters, and various measuring elements and other auxiliary equipments. Refrigerants R22, R407C, and five of their binary mixtures which contain about 0%, 25%, 50%, 75%, and 100% mass fractions of R407C were tested. To determine the effect of the chosen parameters on the system and optimum working conditions, an experimental design method suggested by Genichi Taguchi was used. The most effective parameters are found to be the condenser water mass flow rate for the coefficient of performance and to be condenser water inlet temperature for the exergetic efficiency.

  AtıfWoS6

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