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Journals / Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi / 2026 / Cilt: 19 Sayı: 1

Experimental Investigation of The Transition Process With Single-Phase And Two-Phase Flow Regions In Horizontal Pipes In Terms Of Heat Transfer

Yatay Borularda Tek Fazli Ve İki Fazli Akiş Bölgeleri İle Geçiş Sürecinin Isı Transferi Açisindan Deneysel İncelenmesi

Orhan Yıldırım(ATATÜRK ÜNİVERSİTESİ, MÜHENDİSLİK FAKÜLTESİ, MAKİNE MÜHENDİSLİĞİ BÖLÜMÜ)0000-0001-8780-1297
Hasan Güven(ATATÜRK ÜNİVERSİTESİ)0009-0000-7458-2013
Ayşe Nur Karataş(ATATÜRK ÜNİVERSİTESİ)0009-0004-5433-0256
Şendoğan Karagöz(ATATÜRK ÜNİVERSİTESİ)0000-0003-2618-8788
Ömer Çomaklı(ATATÜRK ÜNİVERSİTESİ)0000-0003-4631-7989
Pages
179–193
Publication Date
2026-03-30
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The results obtained provide engineering data that will contribute to more efficient design of thermal systems such as evaporators and heat exchangers.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:In this study, the effects of flow transition from single-phase (liquid) to two-phase (liquid-vapor) regime on heat transfer in a two-phase flow system in a horizontal pipe are experimentally investigated.
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Key Findings & Data:The behavior of the flow under different mass flow rates, inlet temperatures and heat input levels were analyzed in the experimental system.
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Conclusion & Impact:The results obtained provide engineering data that will contribute to more efficient design of thermal systems such as evaporators and heat exchangers.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:iki fazlı akış · tek fazlı akış · ısı transferi

Abstract

In this study, the effects of flow transition from single-phase (liquid) to two-phase (liquid-vapor) regime on heat transfer in a two-phase flow system in a horizontal pipe are experimentally investigated. The behavior of the flow under different mass flow rates, inlet temperatures and heat input levels were analyzed in the experimental system. In the single-phase flow regime, heat transfer is mainly limited by forced convection mechanisms, whereas in the two-phase region, as the fluid reaches saturation temperature and starts to evaporate, significant increases in the heat transfer coefficient are observed due to complex phenomena associated with phase change such as vapor bubble formation, interfacial movements and condensation. The change in the Nusselt number, the vaporization onset points and the characteristics of the transition regimes in this transition region were evaluated in detail. In addition, the location and width of the transition region are determined by experimental data, emphasizing the critical role of this region in terms of heat transfer performance. The results obtained provide engineering data that will contribute to more efficient design of thermal systems such as evaporators and heat exchangers.

Özet

Bu çalışmada, yatay bir boru içerisinde gerçekleşen iki fazlı akış sisteminde, akışın tek fazlı (sıvı) rejimden iki fazlı (sıvı-buhar) rejime geçişinin ısı transferi üzerindeki etkileri deneysel olarak incelenmiştir. Deneysel sistemde farklı kütlesel debiler, giriş sıcaklıkları ve ısı girdisi seviyeleri altında akışın davranışı analiz edilmiştir. Tek fazlı akış rejiminde ısı transferi esas olarak zorlanmış taşınım mekanizmalarıyla sınırlıyken; akışkanın doygunluk sıcaklığına ulaşarak buharlaşmaya başlamasıyla birlikte, iki fazlı bölgede buhar kabarcığı oluşumu, ara yüzey hareketleri ve yoğuşma gibi faz değişimiyle ilişkili karmaşık fenomenlerin etkisiyle ısı transfer katsayısında belirgin artışlar gözlemlenmiştir. Bu geçiş bölgesinde Nusselt sayısındaki değişim, buharlaşma başlangıç noktası ve geçiş rejimlerinin özellikleri ayrıntılı olarak değerlendirilmiştir. Ayrıca, geçiş bölgesinin yeri ve genişliği deneysel verilerle belirlenmiş, bu bölgenin ısı transfer performansı açısından taşıdığı kritik rol vurgulanmıştır. Elde edilen sonuçlar, buharlaştırıcılar ve ısı değiştiriciler gibi termal sistemlerin daha verimli tasarlanmasına katkı sağlayacak nitelikte mühendislik verileri sunmaktadır.

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Cite This Article

Yıldırım, O., Güven, H., Karataş, A. N., Karagöz, Ş., Çomaklı, Ö., *, O. Y. (2026). Experimental Investigation of The Transition Process With Single-Phase And Two-Phase Flow Regions In Horizontal Pipes In Terms Of Heat Transfer. Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi, Cilt: 19 Sayı: 1, 179–193. https://doi.org/10.18185/erzifbed.1699165

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References (35)

  1. Lin, Y., Luo, Y., Li, W., Cao, Y., Tao, Z., & Shih, T. (2021). Single-phase and Two-phase Flow and Heat Transfer in Microchannel Heat Sink with Various Manifold Arrangements. International Journal of Heat and Mass Transfer, 171, 121118. https://doi.org/10.1016/J.IJHEATMASSTRANSFER.2021.121118
  2. Rau, M., Dede, E., & Garimella, S. (2014). Local single- and two-phase heat transfer from an impinging cross-shaped jet. International Journal of Heat and Mass Transfer, 79, 432-436. https://doi.org/10.1016/J.IJHEATMASSTRANSFER.2014.08.012
  3. Pellicone, D., Ortega, A., del Valle, M., & Schon, S. (2011). Simulation of Two-Phase Flow and Heat Transfer for Practical Design of Mini- and Micro-Channel Heat Exchangers. 517–525. https://doi.org/10.1115/IMECE2011-63637
  4. Sethi, U., Tekwani, H., & Joshi, D. (2018). Single and Two Phase Pressure Drop in Fluid. International Journal of Trend in Scientific Research and Development. https://doi.org/10.31142/ijtsrd12966
  5. Groothuis, H., & Hendal, W. (1959). Heat transfer in two-phase flow. Chemical Engineering Science, 11, 212-220. https://doi.org/10.1016/0009-2509(59)80089-0
  6. Meral, Z., Küçükoğlu, U., Parlak, Z., & Parlak, N. (2024). An experimental investigation of single- and two-phase flow in copper and aluminum microchannel heat sinks. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering. https://doi.org/10.1177/09544089241262957
  7. Zhang, J., Zhang, B., Lei, L., Cheng, C., Xu, J., & Zhou, N. (2022). Experimental Study on Heat Transfer Characteristics of Two-Phase Flow in Square and Rectangular channels. Energies. https://doi.org/10.3390/en15228453
  8. Faghri, A., & Zhang, Y. (2006). Two-phase flow and heat transfer (pp. 853–949). Springer, Cham. https://doi.org/10.1016/B978-0-12-370610-2.50016-7
  9. Kumar, A., & Kothadia, H. B. (2023). Experimental Investigation of Two-Phase Pressure Drop in the Straight Adiabatic Tubes. Multiphase Science and Technology. https://doi.org/10.1615/multscientechn.2023047473
  10. Mohammadi, A., & Koşar, A. (2018). Review on Heat and Fluid Flow in Micro Pin Fin Heat Sinks under Single-phase and Two-phase Flow Conditions. Nanoscale and Microscale Thermophysical Engineering, 22, 153- 197. https://doi.org/10.1080/15567265.2018.1475525
  11. Delil, A. (2002). Tutorial on single- and two-component two-phase flow and heat transfer: Commonality and difference. **, 608, 3-3. https://doi.org/10.1063/1.1449702
  12. Sagar, K. R., & Mehta, H. B. (2018). Experimental investigations on heat transfer characteristics of pulsating single-phase liquid flow and two-phase Taylor bubble flow through a minichannel. Sadhana-Academy Proceedings in Engineering Sciences, 43(3), 1–14. https://doi.org/10.1007/S12046-018-0827-9
  13. Tymen, G., Allanic, N., Sarda, A., Mousseau, P., Plot, C., Madec, Y., & Caltagirone, J.-P. (2018). Temperature mapping in a two-phase water-steam horizontal flow. Experimental Heat Transfer, 31(4), 317–333. https://doi.org/10.1080/08916152.2017.1410505
  14. Faghri, A., Zhang, Y. (2020). Two-Phase Flow and Heat Transfer. In: Fundamentals of Multiphase Heat Transfer and Flow. Springer, Cham. https://doi.org/10.1007/978-3-030-22137-9_10
  15. Guo, Q., Liu, H. L., Xie, G., Guo, C., Xu, Z., & Shao, X. D. (2022). Investigation on the two-phase flow and heat transfer behaviors in a new central uniform dispersion-type heat exchanger. International Communications in Heat and Mass Transfer, 137, 106283. https://doi.org/10.1016/j.icheatmasstransfer.2022.106283.
  16. Chen, X., Ding, T., Cao, H., Ding, H., & Li, Z. (2023). Flow boiling heat transfer mechanisms and flow characteristics of pump-driven two-phase flow systems used in data center cooling. Applied Thermal Engineering, 220, 119642. https://doi.org/10.1016/j.applthermaleng.2022.119642.
  17. Yang, S. G., & Liu, H. L. (2025). Investigation of the heat transfer performance of two-phase flow in a novel step-by-step distributed heat exchanger. International Journal of Heat and Fluid Flow, 112, 109687. https://doi.org/10.1016/j.ijheatfluidflow.2024.109687.
  18. Chen, J. C. (1966). Correlation for boiling heat transfer to saturated fluids in convective flow. Industrial & engineering chemistry process design and development, 5(3), 322-329.
  19. Hewitt, G. F. (1978). Measurement of two phase flow parameters. Nasa Sti/recon Technical Report A, 79, 47262.
  20. Kandlikar, S. G. (2002). Fundamental issues related to flow boiling in minichannels and microchannels. Experimental thermal and fluid science, 26(2-4), 389-407.
  21. Kandlikar, S. G. (2004). "Heat Transfer Mechanisms During Flow Boiling in Microchannels." ASME. J. Heat Transfer. February 2004; 126(1): 8–16.
  22. Thome, J. R. (2004). Boiling in microchannels: a review of experiment and theory. International Journal of Heat and Fluid Flow, 25(2), 128-139.
  23. Thome, J. R. (2004). Engineering data book III. Wolverine Tube Inc, 2010.
  24. Bediako, E. G., Dančová, P., & Vít, T. (2022). Experimental Study of Horizontal Flow Boiling Heat Transfer Coefficient and Pressure Drop of R134a from Subcooled Liquid Region to Superheated Vapor Region. Energies, 15(3), 681. https://doi.org/10.3390/en15030681
  25. Zhang, Z., Zhang, G., Zhang, Y., & Tian, M. (2025). Experimental study on the effect of hydraulic diameter on the flow boiling characteristics in microchannels. International Journal of Heat and Mass Transfer, 241, 126736. https://doi.org/10.1016/j.ijheatmasstransfer.2025.126736
  26. Omeroglu, G., Çomaklı, Ö., Karagöz, Ş., & Manay, E., (2012). Forced Convective Two Phase Flow Analysis İn A Circular Tube Equipped With Twisted Tapes. Energy Education Science And Technology Part A: Energy Science And Research, Vol.30, 561-572.
  27. Omeroglu, G., Çomaklı, Ö., Karagöz, Ş., & Sahin, B., (2013). Experimental Research Of Dynamic Instabilities İn The Presence Of Coiled Wire Inserts On Two-Phase Flow. Scıentıfıc World Journal.
  28. Omeroglu, G., Çomaklı, Ö., Karagöz, Ş., & Karsli, S., (2013). Comparıson Of The Effects Of Dıfferent Types Of Tube Inserts On Two-Phase Flow Instabılıtıes. Journal Of Enhanced Heat Transfer, Vol.20, No.2, 179-194.
  29. Çomaklı, Ö., Karagöz, Ş., Yılmaz, M., & Karsli, S., (2008). Yatay Bir Borudaki Kaynamalı İki Fazlı Akış Kararsızlıkları Ve Akışkan Tipinin Etkileri. Engıneerıng Scıence And Technology-An Internatıonal Journal-Jestech, Vol.11, 15-24.
  30. Aroonrat, K., & Wongwises, S. (2017). Experimental study on two-phase condensation heat transfer and pressure drop of R-134a flowing in a dimpled tube. International Journal of Heat and Mass Transfer, 106, 437-448.
  31. Firat, I., Karagoz, S., Yildirim, O., & Sonmez, F. (2023). Experimental investigation of the thermal performance effects of turbulators with different fin angles in a circular pipe. International Journal of Thermal Sciences, 184, 107969.
  32. Turgut, E., Çakmak, G., Yildiz, C., 2012. Optimization of the Concentric Heat Exchanger with Injector Turbulators by Taguchi Method. Energy Conversion and Management, 53 (1), 268–275.
  33. Duangthongsuk, W. and Somchai, W., 2013. An experimental investigation of the heat transfer and pressure drop characteristics of a circular tube fitted with rotating turbinetype swirl generators. Experimental Thermal and Fluid Science, 45, 8-15.
  34. Yang, W., Jiang, P., Yan, H., He, X., Guan, C., 2015. Performance Assessment in a Tube with Rotor-Assembled Strands Mixed by Spiral Ladder Rotor and Low Flow Resistance Rotor. International Journal of Heat and Mass Transfer, 84, 319–326.
  35. Promvonge, P., Pitak P., Sompol S., 2022. Thermal performance augmentation in round tube with louvered v-winglet vortex generator. International Journal of Heat and Mass Transfer, 182, 121913.