Person: ETEMOĞLU, AKIN BURAK
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ETEMOĞLU
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AKIN BURAK
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Publication Numerical investigation of multiphase transport model for hot-air drying of food(Galenos Publ House, 2019-01-01) Türkan, Burak; TÜRKAN, BURAK; Canbolat, Ahmet Serhan; CANBOLAT, AHMET SERHAN; Etemoğlu, Akın Burak; ETEMOĞLU, AKIN BURAK; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi.; 0000-0002-4019-7835; 0000-0001-8022-1185; AAI-8222-2021; HPH-3328-2023; ABE-9423-2020; AAI-2745-2021; AAI-9653-2021Drying is widely used to prevent microbial spoilage by evaporating the determined amount of liquid in the food sample. In order to reduce energy consumption and increase food flavor quality, modeling the drying process is crucial. In the literature, different approaches are used for investigation of drying characteristic. Among these approaches, the porous media approach have complex phenomena. Molecular diffusion for gases (water vapor and air), capillary diffusion for liquid (water), and convection mechanisms (Darcy flow) were used in drying model in porous media. In this study, firstly, the effect of shrinkage on drying of porous media was investigated. Non-linear partial differential equations for air and food material in the drying problem were solved numerically for non-steady state condition. The shrinkage effect in the drying process was studied by using the ALE (Arbitrary Lagrangian Eulerian) method. In this study, air velocities of 0.5, 0.8 and 1 m s(-1), air temperatures of 40, 50 and 60 degrees C and the geometric forms of rectangular, cylindrical and square were selected for hot air drying process. The fastest drying was obtained at square shape food at the air temperature of 60 degrees C and the air velocity of 0.5 m s(-1). The analysis result showed that the air velocity and temperature have effect on the drying.Publication Optimization of parameters effecting food drying using taguchi method(Pamukkale Üniversitesi, 2020-01-01) Türkan, Burak; Etemoğlu, Akin Burak; TÜRKAN, BURAK; ETEMOĞLU, AKIN BURAK; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği; 0000-0002-4019-7835; 0000-0001-8022-1185; AAI-2745-2021; ABE-9423-2020; AAI-9653-2021This study indicates the optimization of the parameters affecting the drying of the cucumber using the Taguchi method in the convective dryer. Air velocity of 0.5, 0.8 and 1 m/s, air temperature of 40, 50 and 60 degrees C and product thickness of 0.5, 1 and 1.5 cm were taken as drying parameters. At the end of the drying period, the contribution factor of each parameter on the product moisture, shrinkage coefficien4 exergy efficiency, and exergetic improvement potential was investigated by ANOVA analysis. It was detected that the effect of thickness on the drying of the product and the effect of air temperature on exergy efficiency were the highest. The optimum drying conditions were found to be air velocity of 1 m/s, air temperature of 60 degrees C and product thickness of 0.5 cm to minimize drying time. For maximum exergy efficiency, air velocity of 0.5 m/s, air temperature of 60 degrees C and product thickness of 0.5 cm should be selected.Publication Investigation of thermal architectures for flue-gas assisted organic rankine cycle systems: An assessment for thermodynamics and environmental performance indicators(Taylor & Francis, 2020-02-16) Türkan, Burak; Etemoğlu, Akın Burak; Can, Muhiddin; TÜRKAN, BURAK; ETEMOĞLU, AKIN BURAK; Can, Muhiddin; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü.; 0000-0002-4019-7835; 0000-0001-8022-1185; AAI-9653-2021; ABE-9423-2020; AAI-2745-2021In calculations of future energy demand and environmental pollution problems in which waste-heat recovery play a significant role, efficiency often is the primary factor. The organic Rankine cycle (ORC) continues to attract the widespread interest of researchers and/or manufacturer due to technical compatibility, feasibility, and reliability for low to medium grade waste-heat sources. This paper presents thermo-economic analysis on flue-gas assisted organic Rankine cycles (FGA-ORCs) based on both energy and exergy concepts. The heat source of the FGA-ORC system is the exhaust flue-gas of a stenter-frame which is highly used in the textile finishing process. In this study, to convert thermal energy into electrical and/or mechanical energy, an optimization study is performed using three different cycle architectures which have two turbines. Performance indicators such as thermal efficiency, exergetic efficiency, economic profit, performance ratio, and carbon footprint index were examined for the different operating conditions of three investigated thermal architectures. Finally, under the specified operating conditions, the thermal architecture with the best thermo-economic performance was determined by the reduced exergy destruction and increased economic profit due to increased net-work output.Publication Numerical investigation of wood drying(Slovak Forest Products Research Inst, 2019-01-01) Turkan, Burak; TÜRKAN, BURAK; Etemoğlu, Akın Burak; ETEMOĞLU, AKIN BURAK; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makina Mühendisliği Bölümü.; 0000-0002-4019-7835; 0000-0001-8022-1185; AAI-2745-2021; ABE-9423-2020; AAI-9653-2021In this study, forced convective drying process of wood material with rectangular shape was investigated. Firstly, governing equations for the flow field were solved by using ANSYS Fluent. Then average heat transfer coefficient on the surface was calculated by using Standard k-epsilon Turbulence Model. It was found that mass transfer coefficient making use of the relationship between heat and mass transfer. Simultaneous heat and mass transfer equations were solved transiently with Comsol Multiphysics using surface boundary conditions for selected air velocity, air temperature and material thickness. In drying process the moisture and temperature distributions inside the solid were obtained transiently. The mathematical model for equations was formed using Fourier heat and Fick diffusion models. Results acquired from the present model were compared with a study results which are available in literature and it was shown a very good agreement.Publication Performance evaluation for thermal architectures of flue-gas assisted organic rankine cycle systems(Turkish Soc Thermal Sciences Technology, 2020-01-01) Türkan, Burak; TÜRKAN, BURAK; Etemoğlu, Akın Burak; ETEMOĞLU, AKIN BURAK; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi.; 0000-0002-4019-7835; 0000-0001-8022-1185; AAI-9653-2021; AAI-2745-2021; ABE-9423-2020Effective use of waste heat at low and medium temperatures is considered as one of the solutions to alleviate energy shortages and environmental pollution problems. Due to its feasibility and reliability, the organic Rankine cycle is continued to attract widespread interest from researchers and/or manufacturers. This paper presents thermodynamic and economic analyses on flue-gas assisted organic Rankine cycles (FGA-ORCs) based on both energy and exergy concepts. The heat source of the FGA-ORC system is the exhaust flue-gas of a stenter-frame which is highly used in textile finishing process. In this study, to convert thermal energy into electrical and/or mechanical energy on a small scale, an optimization study was performed using five different cycle architectures. Parametric studies were also carried out to investigate the effect of operating parameters on performance indicators such as efficiency, economical profit and performance ratio. Finally, under specified operating conditions, the thermal architecture was identified that reduces exergy destruction and increases economic profit due to increased net-work output. For analyzed cases in this study, Scenario-4 (i.e., thermal architecture 4) shows the best system performance with 69% exergetic efficiency within the thermodynamic and practical limits.Publication Experimental and theoretical investigation of drying kinetics of banana slices(Pamukkale Üniversitesi, 2020-01-01) Türkan, Burak; Etemoğlu, Akın Burak; TÜRKAN, BURAK; ETEMOĞLU, AKIN BURAK; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü; 0000-0002-4019-7835; 0000-0001-8022-1185; AAI-2745-2021; AAI-9653-2021; ABE-9423-2020Modeling of the hot air dehydration period is very important to increase food property and reduce energy consumption. The objective of the study is to examine the drying behaviour of banana slices by using convective hot air drying method. Drying kinetics of the banana slices was investigated experimentally for different air temperatures (40, 50, and 60 degrees C). The drying models were fitted to the experimental data. The model which gives the nearest results to the experimental information was predicted as the Midilli model (R-2=0.99). It was determined that the L (brightness) colour parameter value declined as the moisture content of the food decreased. Effective diffusion coefficients (2.02x10(-10) 5.05x10(-)(10), and 8.08x10(-)(10) m(2) s(-)(1)), activation energy (61.1 kJ (mol)(-1)) and shrinkage coefficients (23%, 32% and 40%) were calculated and it was seen to be compatible with the data given in the literature on food drying. The temperature and moisture content obtained from the experimental study were compared with numerical analysis and found to be compatible.Publication An investigation into evaporative ink drying process on forced convective heat and mass transfer under impinging air jets(Springer, 2019-05-01) Türkan, Burak; Etemoğlu, Akın Burak; Can, Muhiddin; TÜRKAN, BURAK; ETEMOĞLU, AKIN BURAK; Can, Muhiddin; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü; 0000-0002-4019-7835; 0000-0001-8022-1185; AAI-2745-2021; AAI-9653-2021; ABE-9423-2020; CJS-6748-2022Impinging air jets are widely used in industry for drying, cooling and heating due to high heat and mass transfer coefficients which are developed in the impingement region. High velocity heated air impinging jets have proved to be very effective to enhance evaporative ink drying especially on the rotary presses for the packaging and converting industry. In this paper, to provide data for ink dryer designers, an investigation has been carried out to obtain the heat and mass transfer coefficients which constitute the evaporative drying of thin ink films. Finally, the theoretical results are compared for the constant rate period and falling rate period with some experimental and theoretical results found to be satisfactory particularly for the drying time.Publication Structural and magnetocaloric properties of feni high entropy alloys(IOP Publishing, 2021-12-01) Sarlar, Kağan; Tekgül, Atakan; Küçük, Nil; Etemoğlu, Akın Burak; Tekgül, Atakan; KÜÇÜK, NİL; ETEMOĞLU, AKIN BURAK; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü; 0000-0001-6737-3838; 0000-0002-9193-4591; 0000-0001-8022-1185; ABE-9423-2020; GXN-2736-2022; AAI-6808-2021In this study, a new Fe30.7Ni25.7Ga14.6Mn19Si10 without rare earth element high entropy alloy's (HEA) magnetocaloric properties was investigated. The HEA was formed by the suction-casting method. x-ray diffraction (XRD) method was performed for structural analysis. XRD analysis show that both the as-quenched and annealed alloy have a single body centred cubic(bcc) structure. The result obtained from the Arrott plots indicates that the alloys have the second order magnetic phase transition. The transition temperature from paramagnetic to ferromagnetic transition was observed at 442 K and 462 K for the as-quenched and annealed alloy, respectively. The Fe30.7Ni25.7Ga14.6Mn19Si10 HEA shows magnetic entropy change such as 0.75 Jkg(-1) K-1 for as-quenched alloy, 0.90 Jkg(-1) K-1 for annealed alloy at 2 T magnetic field.