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Keywords = ferronanofluid

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29 pages, 6783 KiB  
Review
Iron Oxide Nanoparticle-Based Ferro-Nanofluids for Advanced Technological Applications
by Mohd Imran, Anis Ahmad Chaudhary, Shahzad Ahmed, Md. Mottahir Alam, Afzal Khan, Nasser Zouli, Jabir Hakami, Hassan Ahmad Rudayni and Salah-Ud-Din Khan
Molecules 2022, 27(22), 7931; https://doi.org/10.3390/molecules27227931 - 16 Nov 2022
Cited by 43 | Viewed by 4206
Abstract
Iron oxide nanoparticle (ION)-based ferro-nanofluids (FNs) have been used for different technological applications owing to their excellent magneto-rheological properties. A comprehensive overview of the current advancement of FNs based on IONs for various engineering applications is unquestionably necessary. Hence, in this review article, [...] Read more.
Iron oxide nanoparticle (ION)-based ferro-nanofluids (FNs) have been used for different technological applications owing to their excellent magneto-rheological properties. A comprehensive overview of the current advancement of FNs based on IONs for various engineering applications is unquestionably necessary. Hence, in this review article, various important advanced technological applications of ION-based FNs concerning different engineering fields are critically summarized. The chemical engineering applications are mainly focused on mass transfer processes. Similarly, the electrical and electronics engineering applications are mainly focused on magnetic field sensors, FN-based temperature sensors and tilt sensors, microelectromechanical systems (MEMS) and on-chip components, actuators, and cooling for electronic devices and photovoltaic thermal systems. On the other hand, environmental engineering applications encompass water and air purification. Moreover, mechanical engineering or magneto-rheological applications include dampers and sealings. This review article provides up-to-date information related to the technological advancements and emerging trends in ION-based FN research concerning various engineering fields, as well as discusses the challenges and future perspectives. Full article
(This article belongs to the Section Inorganic Chemistry)
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17 pages, 5633 KiB  
Article
Laminar Pipe Flow with Mixed Convection under the Influence of Magnetic Field
by Johannes Rudl, Christian Hanzelmann, Steffen Feja, Anja Meyer, Annegret Potthoff and Matthias H. Buschmann
Nanomaterials 2021, 11(3), 824; https://doi.org/10.3390/nano11030824 - 23 Mar 2021
Cited by 12 | Viewed by 2767
Abstract
Magnetic influence on ferronanofluid flow is gaining increasing interest from not only the scientific community but also industry. The aim of this study is the examination of the potentials of magnetic forces to control heat transfer. Experiments are conducted to investigate the interaction [...] Read more.
Magnetic influence on ferronanofluid flow is gaining increasing interest from not only the scientific community but also industry. The aim of this study is the examination of the potentials of magnetic forces to control heat transfer. Experiments are conducted to investigate the interaction between four different configurations of permanent magnets and laminar pipe flow with mixed convection. For that purpose a pipe flow test rig is operated with a water-magnetite ferronanofluid. The Reynolds number is varied over one order of magnitude (120–1200). To characterise this suspension, density, solid content, viscosity, thermal conductivity, and specific heat capacity are measured. It is found that, depending on the positioning of the magnet(s) and the Reynolds number, heat transfer is either increased or decreased. The experiments indicate that this is a local effect. After relaxation lengths ranging between 2 and 3.5 lengths of a magnet, all changes disappeared. The conclusion from these findings is that magnetic forces are rather a tool to control heat transfer locally than to enhance the overall heat transfer of heat exchangers or the like. Magnetically caused disturbances decay due to viscous dissipation and the flow approaches the basic state again. Full article
(This article belongs to the Special Issue Colloids and Nanofluids for Energy Management)
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19 pages, 4459 KiB  
Article
Effects of Anisotropic Thermal Conductivity and Lorentz Force on the Flow and Heat Transfer of a Ferro-Nanofluid in a Magnetic Field
by Yubai Li, Hongbin Yan, Mehrdad Massoudi and Wei-Tao Wu
Energies 2017, 10(7), 1065; https://doi.org/10.3390/en10071065 - 22 Jul 2017
Cited by 19 | Viewed by 7514
Abstract
In this paper, we study the effects of the Lorentz force and the induced anisotropic thermal conductivity due to a magnetic field on the flow and the heat transfer of a ferro-nanofluid. The ferro-nanofluid is modeled as a single-phase fluid, where the viscosity [...] Read more.
In this paper, we study the effects of the Lorentz force and the induced anisotropic thermal conductivity due to a magnetic field on the flow and the heat transfer of a ferro-nanofluid. The ferro-nanofluid is modeled as a single-phase fluid, where the viscosity depends on the concentration of nanoparticles; the thermal conductivity shows anisotropy due to the presence of the nanoparticles and the external magnetic field. The anisotropic thermal conductivity tensor, which depends on the angle of the applied magnetic field, is suggested considering the principle of material frame indifference according to Continuum Mechanics. We study two benchmark problems: the heat conduction between two concentric cylinders as well as the unsteady flow and heat transfer in a rectangular channel with three heated inner cylinders. The governing equations are made dimensionless, and the flow and the heat transfer characteristics of the ferro-nanofluid with different angles of the magnetic field, Hartmann number, Reynolds number and nanoparticles concentration are investigated systematically. The results indicate that the temperature field is strongly influenced by the anisotropic behavior of the nanofluids. In addition, the magnetic field may enhance or deteriorate the heat transfer performance (i.e., the time-spatially averaged Nusselt number) in the rectangular channel depending on the situations. Full article
(This article belongs to the Section I: Energy Fundamentals and Conversion)
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12 pages, 1333 KiB  
Article
Applications of Ferro-Nanofluid on a Micro-Transformer
by Tsung-Han Tsai, Long-Sheng Kuo, Ping-Hei Chen, Da-sheng Lee and Chin-Ting Yang
Sensors 2010, 10(9), 8161-8172; https://doi.org/10.3390/s100908161 - 31 Aug 2010
Cited by 45 | Viewed by 12463
Abstract
An on-chip transformer with a ferrofluid magnetic core has been developed and tested. The transformer consists of solenoid-type coil and a magnetic core of ferrofluid, with the former fabricated by MEMS technology and the latter by a chemical co-precipitation method. The performance of [...] Read more.
An on-chip transformer with a ferrofluid magnetic core has been developed and tested. The transformer consists of solenoid-type coil and a magnetic core of ferrofluid, with the former fabricated by MEMS technology and the latter by a chemical co-precipitation method. The performance of the MEMS transformer with a ferrofluid magnetic core was measured and simulated with frequencies ranging from 100 kHz to 100 MHz. Experimental results reveal that the presence of the ferrofluid increases the inductance of coils and the coupling coefficient of transformer; however, it also increases the resistance owing to the lag between the external magnetic field and the magnetization of the material. Full article
(This article belongs to the Section Chemical Sensors)
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