Author:
Duraid Majeed Mutar Department of Mechanics, Technical Institute of Anbar, Middle Technical University, Anbar, Iraq

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Abstract

The aim of the presented is to investigate the effects of different helical fin pitches (20, 40, and 60 mm) on the performance of helical fins on inner tube outer surface. With an outer tube diameter of 65–75 mm, an inner tube diameter of 25–35 mm, and a length of 400 mm, water was used as the heat exchange fluid. The cold fluid entered the inner tube at a 20 °C temperature, with a Reynolds number ranging from 3,000 to 10,000. The hot fluid flowed through the annular space between the two tubes at a constant rate. The study utilized numerical simulation in ANSYS FLUENT v.21 software. The inner pipe was constructed of aluminum, while the outer pipe was insulated. The numerical results indicated that heat transfer and thermal performance initially increased and then decreased as the pitch of the helical fins increased.

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    A. El Maakoula, A. Laknizia, S. Saadeddineb, A. B. Abdellaha, M. Meziane, and M. El Metouia, “Numerical design and investigation of heat transfer enhancement and performance for an annulus with continuous helical baffles in a double-pipe heat exchanger,” Energy Convers. Manage., vol. 133, pp. 7686, 2017.

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    Y. Chen, S. Yang, J. Wu, and J. Zhou, “Impact of helical baffle structure on heat transfer performance of vertical condensers,” Appl. Therm. Eng., vol. 115, pp. 916, 2017.

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    S. S. Pachegaonkar, S. G. Taji, and N. Sane, “Performance analysis of double pipe heat exchanger with annular twisted tape insert,” Int. J. Eng. Adv. Technol., vol. 3, no. 3, pp. 402406, 2014.

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    F. F. Qader, B. Mohamad, A. M. Hussein, and S. H. Danook, “Numerical study of heat transfer in circular pipe filled with porous medium,” Pollack Period., vol. 19, no. 1, pp. 137142, 2024.

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    S. M. Mousavi, A. S. Azizi, M. Razbin, A. A. R. Darzi, and M. Li, “Optimized design of helical-finned double pipe heat exchangers via numerical simulation and artificial intelligence,” Appl. Therm. Eng., vol. 258, no. Part A, 2025, Art no. 124605.

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    L. Tugyi, Z. Siménfalvi, G. L. Szepesi, C. Kecskés, Z. Kerekes, and T. Sári, “CFD modeling of subsonic and sonic methane gas release and dispersion,” Pollack Period., vol. 18, no. 3, pp. 99105, 2023.

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    K. S. Syed, M. Ishaq, Z. Iqbal, and A. Hassan, “Numerical study of an innovative design of a finned double-pipe heat exchanger with variable fin-tip thickness,” Energy Convers. Manage., vol. 98, pp. 6980, 2015.

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  • Dmitrii Rachinskii (Department of Mathematical Sciences, The University of Texas at Dallas, Texas, USA)
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  • Maurizio Repetto (Department of Energy “Galileo Ferraris”, Politecnico di Torino, Italy)
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Pollack Periodica
Language English
Size A4
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