Sürdürülebilir Kalkınma Amaçları

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Yazarlar

• Akkurt, Nevzat(2)
• Abderrahmane, Aissa(1)
• Abed, Ahmed M.(1)
• Alotaibi, Abeer M.(1)
• Bakır, Eda(1)
• Coşanay, Hakan(1)
• Elattar, Samia(1)
• Eldin, Sayed M.(1)
• Fadhl, Bandar M.(1)
• Guedri, Kamel(1)
• Guelcimen, F.(1)
• Gür, Muhammed(1)
• Işık, Erdem(1)
• Kahraman, Gökhan(1)
• Kaya, M.(1)
• Khan, Umair(1)
• Kiliçarslan, A.(1)
• Kurtbas, I.(1)
• Laidoudi, Houssem(1)
• Prasannakumara, Ballajja C.(1)
• Raza, Ali(1)
• Tuğan, Volkan(1)
• Younis, Obai(1)
• Öztop, Hakan F.(1)

• MakaleYalnız künye2023Scopus SJRQ1/r/munzur/1751
  Buoyancy-driven flow and thermal activity of nano-enhanced phase change material in inversed U-shaped chamber

  Younis, Obai; Abderrahmane, Aissa; Laidoudi, Houssem; Akkurt, Nevzat; Fadhl, Bandar M.; Guedri, Kamel

  This work aims to contribute to the positive evolution towards a green world and green energy by studying the natural convection of Nano-Enhanced Phase Change Material NEPCM in an inverted U-shaped cavity. The side walls of the cavity are kept at a cold temperature, while the upper corrugated wall and the lower wall are insulated with the expectation of the hot square body. The governing equations were solved numerically using the Galerkin finite element method (GFEM). The effects of the following factors on the heat transfer rate are presented and discussed: Rayleigh number (Ra = 103–106), number of ripples of the upper wall (N = 1–4), position of the square body (left, centre, and right), volume fraction of nanoparticles (ϕ = 0–0.08), and magnetic field strength (Ha = 0–100). It was found that the effect of N on the heat transfer rate was insignificant, while increasing ϕ reduced the heat transfer rate. In addition, placing the square body near the cold sidewalls (left or right position) improved the averaged Nusselt number (Nuavg), especially at low values of Ra. At the highest Ra studied, increasing Ha reduced the Nuavg by 15 %.

  AtıfScopus11·OpenAlex9

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• MakaleAçık Erişim2022Scopus SJRQ1/r/munzur/2813
  Analysis of turbulent wall jet impingement onto a moving heated body

  Coşanay, Hakan; Öztop, Hakan F.; Gür, Muhammed; Bakır, Eda

  Purpose: The purpose of this study is to make a numerical analysis of a wall jet with a moving wall attached with a heated body. The hot body is cooled via impinging wall jet. Thus, a jet cooling problem is modeled. The Reynolds number is taken in three different values between 5 × 103 ≤ Re ≤ 15 × 103. The h/H ratio for each value of the Re number was taken as 0.02, 0.04 and 0.0, respectively. Design/methodology/approach: Two-dimensional impinged wall jet problem onto a moving body on a conveyor is numerically studied. The heated body is inserted onto an adiabatic moving wall, and it moves in +x direction with the wall. Governing equations for turbulent flow are solved by using the finite element method via analysis and system Fluent R2020. A dynamic mesh was produced to simulate the moving hot body. Findings: The obtained results showed that the heat transfer (HT) is decreased with distance between the jet outlet and the jet inlet. The best HT occurred for the parameters of h/H = 0.02 and Re = 15 × 103. Also, HT can be controlled by changing the h/H ratio as a passive method. Originality/value: Originality of this work is to make an analysis of turbulent flow and heat transfer for wall jet impinging onto a moving heated body.

  AtıfScopus33·WoS34·OpenAlex33

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• MakaleAçık Erişim2022Scopus SJRQ2/r/munzur/2744
  Significance of Free Convection Flow over an Oscillating Inclined Plate Induced by Nanofluid with Porous Medium: The Case of the Prabhakar Fractional Approach

  Raza, Ali; Khan, Umair; Eldin, Sayed M.; Alotaibi, Abeer M.; Elattar, Samia; Prasannakumara, Ballajja C.; Akkurt, Nevzat; Abed, Ahmed M.

  Given the importance and use of electrically conducted nanofluids, this work aims to examine an engine-oil-based nanofluid including various nanoparticles. In the current study, a fractional model for inspecting the thermal aspect of a Brinkman-type nanofluid, composed of (molybdenum disulfide (MOS2) and graphene oxide (GO) nanoparticles flows on an oscillating infinite inclined plate, which characterizes an asymmetrical fluid flow, heat, and mass transfer. Furthermore, the Newtonian heating effect, magnetic field, and slip boundary conditions were taken into account. The objectives for implementing the Prabhakar-like fractional model are justified because this fractional algorithm has contemporary definitions with no singularity restrictions. Furthermore, the guided fractional model was solved using the Laplace transform and several inverse methods. The obtained symmetrical solutions have been visually analyzed to investigate the physics of several relevant flow parameters on the governed equations. Some exceptional cases for the momentum field are compiled to see the physical analysis of the flowing fluid symmetry. The results show that the thermal enhancement can be progressively improved with the interaction of the molybdenum disulfide-engine oil-based nanofluid suspension, rather than with the graphene oxide mixed nanoparticle fluid. Furthermore, the temperature and momentum profiles enhance due to the factional parameters for molybdenum disulfide and the graphene oxide-engine oil-based nanofluid suspension. This study’s graphical and numerical comparison with the existing literature has shown a very close resemblance with the present work, which provides confidence that the unavailable results are accurate. The results show that an increase improved the heat transmission in the solid nanoparticle volume fractions. In addition, the increment in the mass and heat transfer was analyzed in the numerical evaluation, while the shear stress was enhanced with the enhancement in the Prabhakar fractional parameter α.

  AtıfScopus15·OpenAlex15

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• MakaleYalnız künye2021Scopus SJRQ3/r/munzur/2974
  Investigation of the effect of baffle cut on heat transfer and pressure drop in shell-and-tube heat exchangers using CFD

  Işık, Erdem; Tuğan, Volkan

  The shell-and-tube heat exchanger (STHE) is one of the most widely used types of heat exchangers in industry. For this reason, studies conducted to improve the performance of STHEs are of great importance. In this study, a single-shell- and double-tube-pass STHE was designed, and a three-dimensional and steady-state flow analysis of this heat exchanger was conducted using the CFD method. The purpose of the analysis was to investigate the effect of baffle cut and mass flow rate of the fluid on the shell side on heat transfer and pressure drop by using the ANSYS Fluent, which is a type of computational fluid dynamics (CFD) software. For this aim, oil and water are used as working fluids in the shell and tubes of the STHE, respectively. Four different mass flow rates (0.6 kg/s, 0.8 kg/s, 1.0 kg/s, and 1.2 kg/s) are used for the fluid in the shell. In the analysis, three different STHEs with baffle cuts of 20%, 30%, and 40% are compared. According to the results of the CFD analysis, baffle cut plays an important role in heat transfer and pressure drop. The highest heat transfer per pressure drop was achieved for the STHE with 40% baffle cut and the lowest was achieved for the STHE with 20% baffle cut.

  AtıfScopus13·WoS8·OpenAlex11

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• MakaleYalnız künye2021Scopus SJRQ3/r/munzur/2732
  Comparison of heat transfer and condensation on the walls of buildings constructed with iron profiles versus other classic models

  Kahraman, Gökhan

  This study aims to present the evaluation of the thermal performance and the amount of condensation on the walls of a building with iron profiles under steady-state conditions. Elazig, situated in the east part of Turkey, was chosen for fieldwork. In this region, minimum average temperature is around 1°C during winter. Calculations are made in a real wall model and three different wall model scenarios. Estimated advantages and disadvantages of these have been investigated. Heat transfer and condensation amount are taken as variables. In four different building component models, the required amount of energy during the heating period is calculated month by month. Calculations reveal the resistance of the wall without application of insulation material with iron profile is higher than of the other three wall types. The wall built with betopen and iron profile saves 37.5% more energy than the wall with bricks. When the iron-profiled wall model is compared with the insulated brick wall, it is observed that energy savings are similar, but calculations show condensation begins on the iron profile wall. Iron profile buildings become popular increasingly in rural areas. As a result of this study, it is observed that iron profile buildings are advantageous in terms of energy saving compared to other building component models. However, condensation is inevitable in wall components of iron profile buildings and so the damage in the buildings is more than just a disadvantage, it is an irreversible result.

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  AtıfScopus2·WoS3·OpenAlex3

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• MakaleAçık Erişim2014Scopus SJRQ1/r/munzur/4666
  Effect of Swirl Generator Inserted Into a Tube on Exergy Transfer: Decaying Flow

  Kurtbas, I.; Guelcimen, F.; Kiliçarslan, A.; Kaya, M.

  This study experimentally investigates the effect of conical injector type swirl generator inserts on heat and exergy transfer in a uniform heat flux tube for turbulence regime. One hundred twenty watts of heat are applied by coiling a flexible silicone heater on the tube (copper pipe) with an inside diameter of 62mm and length of 1,200mm. The conical injector type swirl generator has a conical shape, which is similar to a funnel, with angle (alpha) of 30 degrees, 45 degrees, and 60 degrees. Circular holes are drilled on the conical injector type swirl generator as three different cross-sectional areas (A(h)). The total areas (A(t) =N.A(h)) of the holes on the conical injector type swirl generator equal each other. Because of this, the three different holes numbers (N) are produced. Flow directors having three different angles (beta=30 degrees, 60 degrees, and 90 degrees) to radial direction are attached to every one of the holes. This study is a typical example for decaying flow. Reynolds number (Re) was varied from 10,000 to 35,000, so the flow was considered as only a turbulent regime. All experiments were conducted with air accordingly; Prandtl number was approximately fixed at 0.71. The local and average heat transfer Nusselt number (Nu(h)) and exergy transfer Nusselt number (Nu(e)) are calculated and discussed in this article. It is found that the Nu(h) increases with an increase in Reynolds number, director angle (beta), and director diameter (d) but with a decrease in the conical injector type swirl generator angle (alpha). However, Nu(e) decreases depending on the same independent parameters.

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  AtıfWoS12·OpenAlex13

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