TY - JOUR A1 - Benim, Ali Cemal A1 - Canal, Cansu Deniz A1 - Boke, Yakup Erhan T1 - A Validation Study for RANS Based Modelling of Swirling Pulverized Fuel Flames JF - Energies N2 - A swirling pulverized coal flame is computationally investigated. A Eulerian–Lagrangian formulation is used to describe the two-phase flow. Turbulence is modelled within a RANS (Reynolds averaged numerical simulation) framework. Four turbulence viscosity- (TV) based models, namely the standard k-ε model, realizable k-ε model, renormalization group theory k-ε model, and the shear stress transport k-ω model are used. In addition, a Reynolds stress transport model (RSM) is employed. The models are assessed by comparing the predicted velocity fields with the measurements of other authors. In terms of overall average values, the agreement of the predictions to the measurements is observed to be within the range 20–40%. A better performance of the RSM compared to the TV models is observed, with a nearly twice as better overall agreement to the experiments, particularly for the swirl velocity. In the second part of the investigation, the resolution of the discrete particle phase in modelling the turbulent particle dispersion (TPD) and particle size distribution (SD) is investigated. Using the discrete random walk model for the TPD, it is shown that even five random walks are sufficient for an accuracy that is quite high, with a less than 1% mean deviation from the solution obtained by thirty random walks. The approximation of the measured SD is determined by a continuous Rosin–Rammler distribution function, and inaccuracies that can occur in its subsequent discretization are demonstrated and discussed. An investigation on the resolution of the SD by discrete particle size classes (SC) indicates that 12 SC are required for an accuracy with a less than 1% mean deviation from the solution with 18 SC. Although these numbers may not necessarily be claimed to be sufficiently universal, they may serve as guidance, at least for SD with similar characteristics KW - DOAJ Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-37365 SN - 1996-1073 VL - 14 IS - 21 PB - MDPI ER - TY - JOUR A1 - Deniz Canal, Cansu A1 - Boke, Yakup Erhan A1 - Aydin, Ozer A1 - Benim, Ali Cemal T1 - COMPUTATIONAL ANALYSIS OF PULVERIZED COAL CO-FIRING WITH BIOMASS IN 150MWe UNIT OF TUNCBILEK THERMAL POWER PLANT JF - Isi Bilimi ve Teknigi Dergisi - Journal of Thermal Science and Technology Y1 - 2021 U6 - https://doi.org/10.47480/isibted.979314 SN - 1300-3615 VL - 41 IS - 1 SP - 37 EP - 50 PB - Turkish Society for Thermal Sciences & Technology ER - TY - JOUR A1 - Biswas, Nirmalendu A1 - Mandal, Dipak Kumar A1 - Manna, Nirmal K. A1 - Benim, Ali Cemal T1 - Magneto-hydrothermal triple-convection in a W-shaped porous cavity containing oxytactic bacteria JF - scientific reports N2 - Bioconvective heat and mass transport phenomena have recently been the subject of interest in diverse fields of applications pertaining to the motion of fluids and their thermophysical properties. The transport processes in a system involving triple convective phenomena, irregular geometry, and boundary conditions constitute a complex phenomenon. This work aims to explore the mixed thermo-bioconvection of magnetically susceptible fluid containing copper nanoparticles and oxytactic bacteria in a novel W-shaped porous cavity. The buoyant convention is generated due to the isothermal heating at the wavy bottom wall, whereas the mixed convection is induced due to the shearing motion of the top-cooled sliding wall. Furthermore, the bioconvection is induced due to the manifestation of oxytactic bacteria or organisms. The inclined sidewalls are insulated. The geometry is packed with water based Cu nanoparticle mixed porous structure, which is subjected to a magnetizing field acted horizontally. The complex transport equations are transformed into nondimensional forms, which are then computed using the finite volume-based developed code. The coupled triple-convective flow physics are explored for a wide range of involved controlling parameters, which could provide helpful insight to the system designer for its proper operation. The shape of geometry can be considered one of the important parameters to control the heat and mass transport phenomena. In general, the influence of amplitude (δ) is more compared to the waviness number (m) of the undulations. The magnitude of heat (Nu) and mass (Sh) transfer rate for the W-shaped cavity is high compared to conventional square and trapezoidal-shaped cavities. The output of the analysis could be very helpful for the designer for modeling devices operating on nanotechnology-based bioconvection, microbial fuel cells, and others. KW - DOAJ Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-40041 SN - 2045-2322 VL - 12 PB - Springer Nature ER - TY - CHAP A1 - Bhattacharyya, Suvanjan A1 - Jain, Naman A1 - Bhatt, Tapasvi A1 - Ghosh, Soumya A1 - Benim, Ali Cemal T1 - Heat Transfer Augmentation in a Mini-channel Using Magnetic Nanofluid and Magnetic Vortex T2 - Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, Düsseldorf, Germany KW - Wärmeübertragung KW - Numerische Strömungssimulation KW - Laminare Strömung KW - Magnetische Flüssigkeit KW - Magnetischer Flussschlauch Y1 - 2024 SN - 9783031666087 U6 - https://doi.org/10.1007/978-3-031-66609-4_1 SN - 2195-4356 VL - 2 SP - 3 EP - 11 PB - Springer Nature CY - Cham ER - TY - CHAP A1 - Biswas, Nirmalendu A1 - Mandal, Dipak Kumar A1 - Manna, Nirmal K. A1 - Benim, Ali Cemal T1 - Thermomagnetic Convection in a Hybrid Nanofluid-Filled Wavy-Walled Porous System with Protruded Bottom Heating T2 - Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, Düsseldorf, Germany KW - Numerische Strömungssimulation KW - Thermomagnetischer Effekt KW - Magnetische Flüssigkeit KW - Finite-Elemente-Methode Y1 - 2024 SN - 9783031666087 U6 - https://doi.org/10.1007/978-3-031-66609-4_35 SN - 2195-4356 VL - 2 SP - 375 EP - 385 PB - Springer Nature CY - Cham ER - TY - JOUR A1 - Bhattacharyya, Suvanjan A1 - Bhatt, Tapasvi A1 - Vishwakarma, Devendra Kumar A1 - Benim, Ali Cemal A1 - Abraham, John T1 - Effect of mechanical vibration and its influence on thermal performance of a nanofluid heat exchanger JF - Numerical Heat Transfer: An International Journal of Computation and Methodology, Part A: Applications KW - Numerische Strömungssimulation KW - Mechanische Schwingung KW - Wärmeaustauscher Y1 - 2024 U6 - https://doi.org/10.1080/10407782.2024.2331589 SN - 1040-7782 SP - 1 EP - 24 PB - Informa ER - TY - CHAP A1 - Yalçınkaya, Orhan A1 - Durmaz, Ufuk A1 - Tepe, Ahmet Ümit A1 - Benim, Ali Cemal A1 - Uysal, Ünal T1 - Numerical Analysis of Roughened Target Surface for Enhancing Jet Impingement Cooling T2 - Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, Düsseldorf, Germany KW - Numerische Strömungssimulation KW - Wärmeübertragung KW - Aufrauhen KW - Kühlung KW - Jet Impingement Cooling Y1 - 2024 SN - 9783031672408 U6 - https://doi.org/10.1007/978-3-031-67241-5_64 SN - 2195-4356 VL - 1 SP - 713 EP - 720 PB - Springer Nature CY - Cham ER - TY - CHAP A1 - Vishwakarma, Devendra Kumar A1 - Bhattacharyya, Suvanjan A1 - Soni, Manoj Kumar A1 - Ghosh, Soumya A1 - Benim, Ali Cemal ED - Benim, Ali Cemal ED - Bennacer, Rachid ED - Mohamad, Abdulmajeed A. ED - Ocłoń, Paweł ED - Suh, Sang-Ho ED - Taler, Jan T1 - Transition Flow Heat Transfer and Pressure Drop in a Uniformly Heated Inclined Solar Air Heater Fitted with Wavy Tapes T2 - Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, Düsseldorf, Germany KW - Numerische Strömungssimulation KW - Druckabfall KW - Wärmeübertragung Y1 - 2024 SN - 9783031672408 U6 - https://doi.org/10.1007/978-3-031-67241-5_63 SN - 2195-4356 VL - 1 SP - 703 EP - 712 PB - Springer Nature CY - Cham ER - TY - CHAP A1 - Benim, Ali Cemal A1 - Çiçek, Aydın T1 - Investigation of the Thermohydraulics of an EGS Project in Turkey: Comparative Assessment of Water and CO2 as Heat Transfer Fluid T2 - Proceedings of CONV-22: Int. Symp. on Convective Heat and Mass Transfer June 5 – 10, 2022, Turkey KW - Numerische Strömungssimulation KW - Thermohydraulik KW - Geothermik KW - Wärmeübertragung Y1 - 2022 U6 - https://doi.org/10.1615/ICHMT.2022.CONV22.580 SP - 439 EP - 446 PB - Begellhouse ER - TY - JOUR A1 - Benim, Ali Cemal A1 - Çiçek, Aydın T1 - Comparative analysis of water and carbon dioxide injection for the thermohydraulics of an EGS project in Dikili Geothermal Field, Türkiye JF - Bulletin Of The Mineral Research and Exploration N2 - A comparative numerical analysis of the thermohydraulics of an enhanced geothermal system (EGS) project in Türkiye in Dikili area is presented. The fractured granodiorite is modelled as porous media, utilizing the numerically suggested data of other authors for the corresponding hydraulic characteristics. As the heat transmission fluid, two different mediums are alternatively considered. These are the more classical medium, water and the supercritical Carbon Dioxide (sCO2). Transient calculations are performed for a time period of twenty years, comparing the temporally developing results obtained for water and sCO2 with each other. Based on modeling parameters and assumptions, higher production temperatures are observed with sCO2, in comparison to water, implying an advantage for sCO2 usage as a working fluid in EGS. This is accompanied by the further advantage of a lower pressure drop for sCO2. On the other hand, the temperature advantage is relativized by the lower specific heat capacity of sCO2 causing a decrease in the production thermal power. In general, the present re found to be encouraging for a further and more detailed analysis of the employment of sCO2 as working fluid in EGS. KW - Numerische Strömungssimulation KW - Thermohydraulik KW - Geothermik KW - Dikili Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-49115 SN - 0026-4563 VL - 171 SP - 91 EP - 105 PB - Maden Tetkik ve Arama Genel Müdürlüğü ER -