https://doi.org/10.1140/epjp/s13360-025-06496-6
Regular Article
Numerical analysis of performance enhancement in a shell and double-coil heat exchanger using three passive flow and heat transfer methods
1
Department of Chemical Engineering, College of Engineering, Imam Mohammad Ibn Saud Islamic University (IMSIU), 11432, Riyadh, Saudi Arabia
2
Faculty of Engineering, University of Warith Al-Anbiyaa, 56001, Kerbala, Iraq
3
Department of Civil Engineering, College of Engineering, Cihan University-Erbil, Erbil, Iraq
4
Mechanical and Industrial Engineering Department, College of Engineering, Qatar University, Doha, Qatar
5
College of Engineering, Department of Mechanical Engineering, Najran University, P.O Box 1988, King Abdulaziz Road, Najran, Kingdom of Saudi Arabia
6
Department of Pathological Analyzes, Al Manara College for Medical Sciences, Maysan, Iraq
7
Deanship of Scientific Research, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia
a
pooya.ghodratallah@cihanuniversity.edu.iq
Received:
14
May
2025
Accepted:
28
May
2025
Published online:
22
June
2025
This study investigates the hydrothermal behavior of hybrid nanofluids within a double helical shell-and-tube heat exchanger enhanced with twisted strips, specifically for applications in the energy and built environment sector. Integrating hybrid nanofluids and turbulence-inducing twisted strips resulted in significant flow mixing and enhanced heat transfer, which is crucial for reducing building energy consumption. The flow arrangement from the spiral coil with a larger diameter demonstrated superior heat transfer rates. The combined use of the turbulator and hybrid nanofluid further increased thermal performance in both flow configurations, with more pronounced improvements observed for the larger coil diameter (Case [A]). In Part (1), significant performance enhancements were seen at Re = 500, with thermal performance (η) increases of approximately 152% (Case [C]), 135% (Case [B]), and 132% (Case [A]) compared to other configurations. Part (2) also showed substantial performance gains at Re = 500, with (η) increasing by roughly 156% (Case [E]), 134% (Case [B]), and 130% (Case [A]). This study conclusively demonstrates that incorporating a double spiral coil with external spiral bands significantly boosts the thermal efficiency of shell-and-coil heat exchangers. Furthermore, the research revealed that using water/MgO-TiO₂ nanohybrid fluid as the working fluid inside the coil yields the highest thermal efficiency for the heat exchanger.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
