Influence of magnetic fields on the thermal conductivity, electrical conductivity, and viscosity of iron-encapsulated multi-walled carbon nanotubes

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-04-19 DOI:10.1016/j.csite.2025.106166

Mohammad J. Akbar , Adil Farooq Wali , Sirajunisa Talath , Abdullah Aljasser , Mohammed M. Aldurdunji , Fahad Alqahtani , Sathvik B. Sridhar , M. Yasmin Begum , Umme Hani

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引用次数: 0

Abstract

This study explores the thermal, electrical, and dynamic viscosity properties of water-based Fe@MWCNT nanofluids, both with and without the influence of an external magnetic field, offering novel insights into the behavior of magnetic nanofluids. The research demonstrates that Fe@MWCNT nanofluids exhibit unique magnetic-responsive characteristics, with thermal conductivity showing a remarkable dependence on external magnetic fields, temperature, and volume concentration. A key finding is the 25 % enhancement in thermal conductivity achieved at a volume concentration of 0.4 % and a temperature of 323.15 K under a 0.05 T magnetic field, a significant advancement in the field of nanofluid-based thermal management. In terms of electrical conductivity, the nanofluids display a tunable range between 530 and 1600 μS/cm as the volume concentration varies from 0.1 % to 1 %. This conductivity is further modulated by temperature and magnetic fields, with increases of 5 %–30 % under 0.05 T and 30 %–70 % under 0.1 T, showcasing the potential for precise control in applications requiring adaptive electrical properties. The dynamic viscosity of the nanofluids, ranging from 0.6 to 1.2 mPa s, is intricately linked to volume concentration, temperature, and magnetic field strength. Notably, the application of a magnetic field can increase viscosity by up to 50 %, a finding that underscores the unique magneto-rheological behavior of Fe@MWCNT nanofluids. This work advances the state of the art by providing a comprehensive understanding of the interplay between magnetic fields, temperature, and nanofluid composition, offering new opportunities for the design of advanced thermal management systems and magnetically tunable fluid technologies. The results highlight the originality of the research, particularly in demonstrating the significant enhancements in thermal and electrical properties under magnetic fields, which have not been extensively explored in previous studies.

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磁场对铁包覆多壁碳纳米管导热性、电导率和粘度的影响

本研究探讨了水基 Fe@MWCNT 纳米流体在外部磁场影响和不影响外部磁场的情况下的热学、电学和动态粘度特性，为磁性纳米流体的行为提供了新的见解。研究表明，Fe@MWCNT 纳米流体具有独特的磁响应特性，其热导率与外部磁场、温度和体积浓度有着显著的相关性。一个重要发现是，在 0.05 T 磁场下，体积浓度为 0.4 %、温度为 323.15 K 时，热导率提高了 25%，这是在基于纳米流体的热管理领域取得的重大进展。在电导率方面，随着体积浓度从 0.1 % 到 1 % 的变化，纳米流体显示出 530 到 1600 μS/cm 的可调范围。这种电导率还可进一步受温度和磁场的调节，在 0.05 T 和 0.1 T 的条件下分别增加 5%-30% 和 30%-70%，显示了在需要自适应电特性的应用中进行精确控制的潜力。纳米流体的动态粘度从 0.6 到 1.2 mPa s 不等，与体积浓度、温度和磁场强度密切相关。值得注意的是，应用磁场可使粘度增加高达 50%，这一发现强调了 Fe@MWCNT 纳米流体独特的磁流变行为。这项研究全面了解了磁场、温度和纳米流体成分之间的相互作用，为设计先进的热管理系统和磁可调流体技术提供了新的机遇，从而推动了这项技术的发展。研究结果凸显了这项研究的原创性，尤其是在磁场作用下显著增强了热性能和电性能，而这在以往的研究中尚未得到广泛探讨。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.