TY - JOUR T1 - CFD Modeling of the One-Ended Inclined Pipe-Tank System TT - Tek Uçlu Eğimli Boru-Tank Sisteminin HAD Modellemesi AU - Bayhan, Burhan AU - Arslan, Gökhan PY - 2025 DA - December Y2 - 2025 JF - Necmettin Erbakan Üniversitesi Fen ve Mühendislik Bilimleri Dergisi JO - NEU Fen Muh Bil Der PB - Necmettin Erbakan University WT - DergiPark SN - 2667-7989 SP - 361 EP - 371 VL - 7 IS - 3 LA - en AB - In this study, Computational Fluid Dynamics (CFD) method was used in the numerical analysis of the natural circulation experiments of the one-ended inclined pipe-tank system conducted in the laboratory. As a result of the numerical analysis, velocity vectors and temperature contours were obtained. According to these results, it was concluded that natural circulation exists and that it is more effective near the tank inlet of the inclined pipe and that this effectiveness decreases as one moves towards the closed bottom of the pipe. In addition, when the tank average temperature obtained as a result of the 6-hour experiment is compared with the average tank temperature obtained as a result of the numerical analysis, it is concluded that the thermal regime is provided in the experiments with high power of 600 and 800 W applied to the inclined pipe and that more time is required to provide the thermal regime in the experiments with lower power of 200 and 400 W.00 W. KW - Natural flow KW - One-ended inclined pipe KW - CFD N2 - Bu çalışmada, tek uçlu eğimli boru-tank sisteminin laboratuvarda yapılan doğal dolaşım deneylerinin sayısal analizinde Hesaplamalı Akışkanlar Dinamiği (HAD) yöntemi kullanılmıştır. Sayısal analiz sonucunda hız vektörleri ve sıcaklık konturları elde edilmiştir. Bu sonuçlara göre, doğal dolaşımın var olduğu ve eğimli borunun tank girişine yakın yerde daha etkili olduğu ve borunun kapalı dip kısmına doğru gidildikçe bu etkinliğin azaldığı gibi çıkarımlar yapılmıştır. Ayrıca 6 saatlik deney sonucunda elde edilen tank ortalama sıcaklığı ile sayısal analiz sonucunda elde edilen ortalama tank sıcaklığı kıyaslandığında, eğimli boruya uygulanan 600 ve 800 W yüksek güçteki deneylerde ısıl rejimin sağlandığı ve 200 ve 400 W daha düşük deneylerde ise ısıl rejimin sağlanması için daha çok zaman gerektiği sonucuna varılmıştır. CR - G. Arslan, B. Bayhan, K. Yaman, Mersin/Türkiye için ölçülen global güneş ışınımının yapay sinir ağları ile tahmin edilmesi ve yaygın ışınım modelleri ile karşılaştırılması, Gazi University Journal of Science Part C: Design and Technology. 7(1) (2019), 80-96. doi: 10.29109/gujsc.419473 CR - B. Bayhan, G. Arslan, Applicability of solar and wind energy technologies for a non-residential Building, Turkish Journal of Engineering. 2 (1) (2018), 27-34. doi: 10.31127/tuje.341462 CR - G. Arslan, B. Bayhan, Solar energy potential in Mersin and a simple model to predict daily solar radiation, Mugla Journal of Science and Technology. Special Issue (2016), 1-4. https://dergipark.org.tr/en/pub/muglajsci/issue/25591/269956 CR - M. Hacıbeyoglu, M. Çelik, Ö. E. Çiçek, K en yakın komşu algoritması ile binalarda enerji verimliliği tahmini, Necmettin Erbakan University Journal of Science and Engineering. 5(2) (2023), 65-74. doi: 10.47112/neufmbd.2023.10 CR - B. Akgayev, S. Akbayrak, M. Yılmaz, M. S. Büker, V. Unsur, Assessing the feasibility of photovoltaic systems in Türkiye: Technical and economic analysis of on-grid, off-grid, and utility-scale pv installations, Necmettin Erbakan University Journal of Science and Engineering. 6(1) (2024), 69-92. doi: 10.47112/neufmbd.2024.33 CR - A. O. Özkan, H. B. Demı̇r, Fotovoltaik panellerde sıcaklık ve zenit açısının panel güç üretimine etkisi, Necmettin Erbakan University Journal of Science and Engineering. 1(1) (2019), 1-9. https://dergipark.org.tr/en/download/article-file/698145 CR - M. İ. Özgün, A. B. Batibay, B. Ünal, Y. R. Eker, A. Terlemez, Investigation of the use of TiO2 obtained from endodontic NiTi files in dye-sensitized solar cells, Necmettin Erbakan University Journal of Science and Engineering. 5(1) (2023) 1-8. doi: 10.47112/neufmbd.2023.4 CR - S. Ata, M. E. Boyacıoğlu, R. Şahin, A. Kahraman, ORÇ ile düşük sıcaklıklı ısı kaynaklarından elektrik üretilmesinde ıslak ve yeni nesil akışkanların çevresel ve termodinamik performanslarının karşılaştırılması, Necmettin Erbakan University Journal of Science and Engineering. 2(1) (2021), 1-13. doi: 10.47112/neufmbd.2021.6 CR - H. D. Arslan, S. M. A. Bilgili, S. Doğan, Farklı ilkim bölgelerinde TOKİ tip konutlarının doğal havalandırma analizi, Necmettin Erbakan University Journal of Science and Engineering. 6(1) (2024), 21-39. doi: 10.47112/neufmbd.2024.30 CR - P. M. Malkin, Design of Thermosyphon Solar Domestic Hot Water Systems, M. S. Thesis, University of Wisconsin, Madison, Wis., USA, 1985. CR - W. P. Akanmu, P. A. Bajere, Investigation of temperature and flow distribution in a serially connected thermosyphon solar water heating collector system, Journal of Energy Technologies and Policy. 5(2) (2015), 56-68. https://core.ac.uk/download/pdf/234668006.pdf CR - R. B. Bejjam, K. K. Kiran, Numerical study on heat transfer characteristics of nanofluid based natural circulation loop, Thermal Science. 22(2) (2018), 885-897. doi: 10.2298/TSCI160826087B CR - J. Li, X. Li, Y. Wang, J. Tu, A theoretical model of natural circulation flow and heat transfer within horizontal evacuated tube considering the secondary flow, Renewable Energy. 147(1) (2020), 630-638. doi: 10.1016/j.renene.2019.08.135 CR - K. A. Pleshanov, E. G. Khlyst, M. N. Zaichenko, K. V. Sterkhov, Design of a natural circulation circuit for 85 MW steam boiler, Thermal Science. 21(3) (2017), 1503-1513. doi: 10.2298/TSCI161005320P CR - A. Riahi, H. Taherian, Experimental investigation on the performance of thermosyphon solar water heater in the south caspian sea, Thermal Science. 15(2) (2011), 447-456. doi: 10.2298/TSCI1102447R CR - M. Misale, J. A. Bocanegra, A. Marchitto, Thermo-hydraulic performance of connected single-phase natural circulation loops characterized by two different inner diameters, International Communications in Heat and Mass Transfer. 125 (2021), 105309. doi: 10.1016/j.icheatmasstransfer.2021.105309 CR - J. A. Bocanegra, A. Marchitto, M. Misale, Thermal performance investigation of a mini natural circulation loop for solar pv panel or electronic cooling simulated by lattice boltzmann method, International Journal of Energy Production and Management. 7(1) (2022), 1-12. https://www.witpress.com/Secure/ejournals/papers/EQ070101f.pdf CR - B. Bayhan, G. Arslan, Theoretical model of natural circulation flow and heat transfer within one-ended inclined pipe, Thermal Science. 26(6B) (2022), 5187-5198. doi: 10.2298/TSCI220402100B CR - B. Bayhan, G. Arslan, Experimental investigation of natural circulating solar energy system including a parabolic trough solar collector, Journal of Solar Energy Engineering. 147(2) (2025). doi: 10.1115/1.4066301 CR - M. W. K. Jaber, et al., Transient evolution of thermal stratification and passive flow guidance inside a heat exchanger immersed thermal energy storage tank, Journal of Energy Storage. 88 (2024), 111472. doi: 10.1016/j.est.2024.111472 CR - E. Canlı, A. Ates, Ş. Bilir, Developing turbulent flow in pipes and analysis of entrance region., Academic Platform-Journal of Engineering and Science. 9(2) (2021), 332-353. doi: 10.21541/apjes.818717 CR - E. Canli, A. Ates, S. Bilir, Numerical Scheme for Dimensionless Natural Convection Analysis of Vertical Pipe, içinde: Proceeding Book, 23rd Congress on Thermal Science and Technology with International Participation. 2021, 1283-1293. CR - E. Canli, A. H. Altun, A. Ates, Hydrodynamic and Thermal Simultaneous Development in Pipes for All the Three Thermal Boundary Condition Types Using CFD, içinde: Proceeding Book, 4th International Conference on Life and Engineering Sciences, İstanbul, Turkey, 2021, 185-205. CR - E. Canli, H. Kucuksariyildiz, K. Carman. Impact assessment of new generation high-speed agricultural tractor aerodynamics on transportation fuel consumption and related phenomena, Environmental Science and Pollution Research. 30(3) (2023), 6658-6680. doi: 10.1007/s11356-022-22642-4 CR - B. Bayhan, Parabolik Oluklu Güneş Kolektörü İçeren Doğal Dolaşımlı Güneş Enerji Sisteminin Deneysel ve Sayısal İncelemesi, Doktora Tezi, Mersin Üniversitesi Fen Bilimleri Enstitüsü, Makine Mühendisliği Anabilim Dalı, Mersin, 2022. CR - S. J. Kline, F. A. McClintock, Describing uncertainties in single sample experiments, Mechanical Engineering. 75(1) (1953), 3-8. CR - N. Tokgoz, Ö. Süfer, Hesaplamalı akışkanlar dinamiğine genel bir bakış, Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi. 6(3) (2023), 2392-2408. doi: 10.47495/okufbed.1191498 UR - https://dergipark.org.tr/en/pub/neufmbd/issue//1569704 L1 - https://dergipark.org.tr/en/download/article-file/4298165 ER -