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| Format: | Artículo Open Access |
| Published: |
Wiley
2025
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| Online Access: | https://onlinelibrary.wiley.com/doi/10.1002/fld.70013 |
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Table of Contents:
- A Comparative Study on Heat Transfer and Entropy Generation of Ferrofluid Flowing Through a Double‐Tube Heat Exchanger Subjected to Various Magnetic Fields Ali Jalayeri Reza Rahimi International Journal for Numerical Methods in Fluids ABSTRACT Double‐tube heat exchangers using ferrofluids under magnetic fields, which induce vortices, improve heat transfer and reduce irreversibilities. This study analyzes heat transfer and entropy generation of Fe 3 O 4 /water in a double‐tube heat exchanger at Re = 100, subjected to magnetic fields. Key parameters, including inner tube cross‐sectional geometry and magnetic field characteristics (intensity, wire distance, configuration, and number), are examined and optimized. The flow structure, heat transfer, friction factor coefficient, performance evaluation criterion ( PEC ), and entropy generation are evaluated based on thermodynamic principles. A finite volume numerical code is developed to solve the governing equations and consider the magnetic field through a UDF code on thermal and entropy performance using the SIMPLE algorithm. The investigation is evaluated: (1) the impact of the inner tube's cross‐sectional geometry, (2) the effect of the current‐carrying wire and outer tube distance, and (3) the influence of the magnetic field's arrangement and number. Altering the cross‐sectional geometry shows that a vertically elliptical shape increases heat transfer by 81%, while the horizontally elliptical shape achieves the best overall performance. Adjusting the wire distance to d / r 0 = 0.125 offers better overall operational performance by considering the heat transfer and entropy simultaneously. Additionally, a horizontal arrangement with two magnetic fields, which represents the optimal configuration, improves heat transfer and pressure drop by 2.8 and 21 times at Mn = 2 × 10 10 , and enhances the PEC by 39%. These findings can be applied in the field of energy system optimization, especially where compact design and high thermal efficiency are critical requirements. 10.1002/fld.70013 http://onlinelibrary.wiley.com/termsAndConditions#vor